Showing 31 results for Heavy Metal
Mostaf Tatina , Shahrbanoo Oryan, Mahtab Gharibkhani,
Volume 1, Issue 1 (12-2009)
Abstract
Mahnazsadat Sadeghi , Narges Mooraki , Soorena Ebdali , Masoud Farzadmehr,
Volume 3, Issue 4 (3-2012)
Abstract
The present research was carried out in winter 2010 and summer 2011 for the purpose of determining the concentration amount of the heavy metals (Pb, Cd, Ni) in liver and muscle tissues of the “Scomberomorus guttatus” in Hormozgan province water, (Bandar Abbas) shore. In every season, 20 samples were selected by simple random method. The samples were tested biologically. Afterwards, microwave digestion method was used to extract metals from the muscles and liver of the fishes. Lead, Nickel and Cadmium content were determined by Varian atomic furnace equipment, GTA 100 model. Average concentrations of Lead, Cadmium and Nickel in liver were determined to be 0.4652±0.03897, 0.3536±0.03552 and 0.5010±0.06972 and in muscle 0.2934±0.02661, 0.0375±0.00319 and 0.2667±0.04930 µg/g-1 on dry weight respectively. Results indicated, using Kruskal-wallis test, that there is a significant different between the content of the three metals in liver tissue and muscle of fishes (P<0.05).
Zohreh Ahmadi Kordestani, Amirhossein Hamidian, Seyed Vali Hosseini, Sohrab Ashrafi,
Volume 5, Issue 1 (6-2013)
Abstract
Among the pollutants inaquatic ecosystems, heavy metalsare considereddangerouspollutants due to theirtoxic effectsand bioaccumulation in organisms. They can cause chronicand acutepoisoning when consumed by human. Mercury is one of the most toxic metals, which can accumulate in a food chain and in the most top of it, the human body. Inthisstudyconcentrations ofmercury were measured infour speciesofaquaticorganisms, black pomfret, white Indian prawn, white leg shrimp and crayfish andthe consumptionrisk assessment for each of theseseafood species were assessed. Samples were obtained from Tehran market and the muscles of species were dissected and wetdigested. The concentrations of mercury insolutions were determined usingcold vaportechnique andatomic absorption spectroscopy. The average concentrations of mercury in muscle of the species were0.331, 0.323, 0.346 and 0.113 μg g-1 wet weight, respectively. These concentrations were within standard levels determined by the international organizations such asWHO,FAO, EPA, FDA, EC and MAFF. HQ index was below 1 for all species. Therefore, the consumption of these seafood species is not a serious threat to the consumer’s health in terms ofmercury concentration.
Nima Farkian, Gholamhossein Mohammadi, Abolfaz L Askari Sari,
Volume 5, Issue 3 (12-2013)
Abstract
This study was performed for comparingthe accumulation of heavy metal mercuryin fish muscle tissue of the Southern meager (Argyrosomushololepidotus) and its correlation with age, total length and total weight inthe Persian Gulf waters in 1391. Sampling of fishing stations located in Abadan and Hendijancarried outduring the months of March to November. 80 samples were collected in 5 age groups. After samplingof muscle, compound samples were obtained according to standard methods Moopam. Mixedsamples were wet-chemical digestion method and Concentration of mercury by atomic absorption was performed with a Perkin Elmer 4100 Model. Mean concentrations of mercury in the southern meager muscle tissue were 84.86±19.92 μg/kg dry weight (P<0.05). The highest mercury concentration among different age groups was 118.5±11.61 μg/kg dry weight at age 8-10 -year - old. There was a positive correlation betweenconcentration of mercury with total length and total weight withoutsignificant difference (P≥0.05). The relationship between mercury concentration and age was positive and significant (P-value = 0.0032). Average metal concentrations in flesh tissues was lower thanWHO and the FDA.
Hassan Nasrollahzadeh Saravi , Shaban Najafpour, Maryam Rezaei, Abdolah Solaimaniroudi,
Volume 6, Issue 1 (6-2014)
Abstract
This study was conducted to determine six heavy metals (Zn, Cu, Ni, Pb, Cd and Hg) concentrations in water (during four seasons) at eight transects (Astara, Anzali, Sefidroud, Tonekabon, Nowshahr, Babolsar, Amirabad and Turkman) in the southern coasts of the Caspian Sea in 2010-2011. 93 samples of water were collected at 10, 50 and 100 meters depths. All samples were prepared by extracting processes and then determined using Atomic Absorption Spectroscopy (AAS) instrument. Results of current study showed that maximum values of Zn, Ni, Pb and Hg were observed inspring and for Cd was inwinter. Also, at the west and center regions were more contaminatedthanthe east part. Annual mean contents and standard error (±SE) of water were registered 2.10 ±0.59, 1.64 ±0.18, 0.68 ±0.10, 0.11 ±0.01 mg/l and 3.30 ±0.40 µg/l for Ni, Pb, Cd, Zn and Hg, respectively. The mean values of the examined heavy metals with percentage (in parenthesis) in water samples during four seasons were obtained in this order Ni(46.3%)>Pb(39.1%)>Cu(15.0%)>Zn (2.5%)>Hg(1.0%). In conclusion, the results revealed that in the most transects the heavy metal concentrations of water were above the threshold levels associated with the toxicological effects and the regulatory limits (ANZECC, MPL and UKMPA) which represented polluted condition in this area. In addition, correlation between environmental parameters and heavy metals showed that the addition of different resources of metals,different behavior of bio-geochemical behavior was influenced on their concentrations.
Jafar Ehsani, Laleh Roomiani,
Volume 6, Issue 1 (6-2014)
Abstract
This study was carried out to comparison heavy metals accumulation (Zn), (Cu), (Cd) and (Pb) in muscle and shell of Litopenaeusvannamei and Metapenaeusaffinis in 2013. Thus, 6 kg M. affinis from coast of Bahrekan and 6 kg L. vannamei collected from site of Delvar in Bushehr Province. Preparation of samples was doneand digested using nitric acid and Zn using flame system and Cu, Cd and Pbusing graphite oven of absorption spectrophotometer were measured. Results of all heavy metals in muscle and shell in M. affiniswerehigher significantly (P<0.05)than inL. vannamei unlike toPb(P>0.05). Metals in shell of two specieswere higher than muscle, thus showed significant difference(P<0.05) except forPb (P>0.05). Results showed higher mean(± SD) concentrations of Zn were observed in shell and muscle of M. affinis (44.6±15.67 and 38.6±12.85 mg/kg) and in L. vannamei (40.6±13.66 and 34±9.52 mg/kg) and lower concentrations of Cd were observed. Sequence of concentration of heavy metals in two species and their organs followedthe order of Zn> Cu>Pb> Cd.
Mehdi Soltani, Abbas Bozorgnia, Roghayeh Seyedpour, Maryam Barzegar, Ali Taheri Mirghaed,
Volume 6, Issue 2 (8-2014)
Abstract
Heavy metal pollution of aquatic ecosystem and consequently accumulation of these metals in aquatic organism tissues is one of the recent concerns in seafood industries. Current study has been focused on concentration of some essential and non–essential (toxic) heavy metals in different tissues of the Caspian Kutum, Rutilus kutum and Caspian Roach, Rutilus rutilus as species for human consumption, that arevery dangerous for environment. A total of 100 fish samples of two species, Rutilus kutum and Rutilus rutilus were caught from Babolsar and Tonekabon stations (in the southeast of Caspian Sea) during fishing seasons in 2011 and 2012. The muscle, liver andgonad samples from two species were carefully dissected for the determination of heavy metals, Copper, Lead and Cadmium levels. Heavy metals studied at this research are hazardous substances in the environment.Levels of heavy metals were determined using Atomic Absorption Spectrophotometer and statistical analysis was carried out by SPSS19 software. The result showedthat the Lead concentration was the maximum levelsfollowed by Cu >Cd, while metal abundance in different organs of these fish was in the order liver>gonad>muscle. Cadmium was the least accumulated metal.The highest levels of Pb and Cu were recorded in liver tissues.Linear regression analysis showed that there was a significant increase in the level of Pb in muscles, livers and gonads of both in Kutumand Roach. Also there was a significant positive relationship between fish size and the Cu in livers of the fishes. The data showed that the edible part of fish do not carry heavy metals loads and their concentrations werebelow the legal value for fish and fish products established by World HealthOrganization (WHO), NHMRC and UK (MAFF)showed that the fish frominvestigated region are safety for consumers.
Elham Gheisari, Ebrahim Rahimi, Amir Shakerian, Mehdi Raissy, Soheil Omidvar, Fatemeh Ghorbani, Zeinab Torki,
Volume 6, Issue 4 (3-2015)
Abstract
The present study was done for evaluation of the effects of different cooking methods (boiling, steaming and frying) on arsenic and mercury content of Indian shrimp (Fenneropenaeus indicus). Wet digestion method and atomic absorption spectrophotometer was used in order to extract and determine arsenic and mercury residue in experimental samples. The mean recovery rate was 90.6 and 102% for mercury and arsenic, respectively. Mean concentrations of arsenic and mercury in raw shrimp samples was 237.67±27.01 and 115.67±16.86 µg/kg, respectively. The results of this study revealed that arsenic concentration in fried shrimp samples with average of 459.42±63.66 µg/kg was increased which was statistically significant (P<0.05). On the other hand, mercury concentration in steamed, poached and fried samples was decreased comparing to the control samples. The results revealed that frying which is one of the most common methods of cooking aquatics in Iran, is not desirable method for consumer health. The result of this study also showed the importance of periodically monitoring the residue levels of mercury and arsenic in seafood.
Alireza Riahi Bakhtiari, Zahra Darvishnia, Ehsan Kamrani, Mirmasoud Sajjadi,
Volume 7, Issue 3 (11-2015)
Abstract
The following research was conducted to determining the nickel (Ni) and cadmium (Cd) concentrations in skeleton of coral family (Faviidae) and sediments of dominant in Zeyton Park, Naz Islands and Shib-deraz stations, south of Qeshm Island- Persian Gulf in summer 2012. The analysis of these heavy metal levels in digested samples of skeleton and sediments was done using graphite furnace Atomic Absorbtion Spectophotometry (SHIMADZU, AA 670G) for Cd and Flame Atomic Absorption Spectophotometry (SHIMADZU, AA 670) Ni. The results indicated that there were significant differences in concentrations of Ni and Cd in skeleton of coral family (Faviidae) among Zeyton Park, Naz Islands Shib-deraz stations (P<0.001) and concentration of Ni and Cd in sediments of coral family (Faviidae) there are significant differences between Zeyton Park, Naz Islands and Shib-deraz stations (P<0.05 and P<0.001, respectively). There was a negative correlation between Ni concentration in Favidae coral and its surrounding sediments in Shib-deraz stations. Besides, there was statistical correlation in Cd concentration between coral family (Faviidae) in Zeyton Park and Shib-deraz stations. Coral Skeletons and sediments in the study area was not contaminated with heavy metals Ni and Cd compared to the results with universal standards. So, concerning the immense importance of coral ecosystem in the southern Qeshm Islands and the result of this research, corals can be suggested as a pollution biomonitor.
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Volume 8, Issue 3 (11-2016)
Abstract
The purpose of the present study was to examine the heavy metals concentrations (Nickel, Vanadium, Lead, Cobalt and Cadmium) discharged through the ballast tanks of commercial ships within two seasons (Winter 2014, Summer 2015) at Bandar-e Imam Khomeini situated in the northwest of Persian Gulf. Carrying of chemical substances as well as various flora and fauna species by ships' ballast tanks is a globally significant problem. A specimen of water and deposit inside of ballast tanks from 12 commercial ships (loaded with ironstone, condensate and ironware) traveled from South America and southwest Asia was taken. Three samples of water and deposit of each ship were prepared and then by EPA, 2007, the concentration of the traces was measured using ICP device. The average concentrations of lead, cobalt, cadmium, nickel and vanadium existing in the water specimen carried from South America within two seasons were 4.31±1.54, 3.41±1.19, 1.73±1.02, 3.33±1.45 and 0.5±0.01 (ppm), respectively and its maximum amounts were 4.55±1.94, 3.45±0.88, 1.77±152, 3.52± 1.26 and 0.5±0.01 (ppm). The traces' average concentrations carried from Southeast Asia were 4.20±0.92, 1.92±0.75, 1.52±0.32, 1.66±0.61 and 0.05±0.01 (ppm) and its maximum amounts were 4.21±0.71, 1.94±0.12, 1.29±0.52, 1.68±0.4 and 0.05±0.01 (ppm). Also, the concentration amounts of the traces in the deposit transported from South America by the ships within two seasons were 65.5±10.62, 27.6±4.45, 0.1±0.001, 47.83±3.30, 25.46±1.56 (mg/kg) and its maximum amounts were 67.5±10.75, 29.5±4.47, 0.1±0.001, 50.93±1.95 and 25.70±2.00 (mg/kg) and those carried from southeast Asia at the same period were 94.±23.45, 29.03±3.21, 0.1±0.001, 55.5±5.05 and 41.32±3.25 and its maximum amounts were1.06±29.41, 32.9±3.76, 0.1±0.01, 61.12±3.79 and 41.85±2.76, respectively. Also, by comparing the concentration of metals in water and sediment ships no significant difference between the two seasons (P>0,05) and only lead to a significant difference between the two seasons in the direction of South America there was (P< 0,05). The concentration of these metals in both routes in the summer more than winter showed, Sensing water and sediments on the route of Southeast Asia South America also showed higher levels of the path. The metal concentrations in the sediments of the season for both track and both vessels were significantly different from those in the water (P<0.05). Comparison of the above amounts with those of water (ROPME, 2003) and deposit (EPA, 2005) standards showed that the traces concentrations of both water and deposit inside the ballast tanks are in the standard range and tolerable and have no any damage for environment
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Volume 8, Issue 3 (11-2016)
Abstract
The aim of this study was to measure heavy metals lead, nickel and copper concentrations in gills of the fish (Siganus javus) and in the coastal areas along the Province of Bushehr. For this purpose, 60 fish and 9 sediment samples from July to February 2015 in three stations (Kalat port, Dayer port, Nayband golf) based on user types in Bushehr was sampled. Preparation and analysis of samples was done according to standard laboratory methods MOPPAM and Atomic Absorption Spectrometer (Savant AA). The results showed that the accumulation of metals in sediments Kalat port, Dayer port and Nayband golf lead were 6.53 5.42, 16.33; nickel were 17.7, 9.68, 1.49 and copper were 7.58, 7.7, 6.98 μg/g, respectively. These showed significant difference except for copper metal. In general, the process of absorption of heavy metals in sediments was Ni > Pb > Cu. And the during deposition of America and Canada sedimentology standards all metals were below the standard limit. The results of absorption of metals in fish gills showed that the general lead, nickel and copper was 0.56, 2.7, 13.12 μg/g, respectively. Pearson correlation test results showed that there was a significant correlation in weight and length index with the absorption of metals lead and nickel. It also explores the relationships between the accumulation of metals, between the nickel with copper and lead a significant positive relationship was observed. The highest concentrations of lead, nickel and copper in the gills of fishes was observed in the, Dayer port, Kalat port and Nayband golf, respectively and showed significant difference. All metals concentrations was higher than standard limit in compared with WHO standard limit.
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Volume 8, Issue 4 (3-2017)
Abstract
Histopathological changes in the liver and gills of grey mullet (Mugil cephalus L.) fed with diets containing amino-acid L-cysteine and exposed to heavy metals copper and zinc was investigated in 2016 at Chabahar Maritime University. The aim of this research was the determining of the effects different concentrations of amino-acid L-cysteine on the liver and gill tissues of grey mullets, against the pollution of these metals. For this purpose 300 grey mullet juveniles with an average weight of 27.4±3 g were captured from the coastal waters of Chabahar Bay, and after adaptation to the laboratory conditions and artificial feeding, were divided into seven treatments (one control group, three cu treatment and three Zn treatments). In this study, the experimental fishes were exposed to heavy metals Cu and Zn (20% more than their natural concentration in the coastal waters of the University), and fed with four diets containing (0, 25, 50 and 100 percentage) of cysteine relative to the cysteine content of the basal diet for 45 days. At the end of culture period (45 days) random tissue samples from the gills and liver of all treatments were taken, and after dehydration, fixation in paraffin, discoloration and clearing were stained by hematoxylin and eosin solutions. The results of microscopic observation of prepared samples revealed that the severity of tissue damage in treatment three (with 100% cysteine) was the most; while in treatment one (with 25% cysteine) was the least compared with other treatments. Moreover, the diet containing 25% cysteine was more efficient compared to the other diets with higher cysteine content (50 and 100%), in terms of severity of damages, while in the higher concentrations of cysteine, the severity of damages was intensified concurrent with the effects of the heavy metals. Therefore, the obtained results proved that the amino-acid cysteine improves the detoxification process by influencing the metabolism of metals in fish, and reduction of the harmful action of heavy metals on the histopathological changes of the liver and gills. Besides the liver and gill tissues can be used as suitable indicators for the assessment of histopathological changes inflicted by heavy metals in mullet fishes.
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Volume 9, Issue 1 (6-2017)
Abstract
The objective of this study was to determine concentrations of zinc, cadmium and lead in the surface water, sediment and shrimp (Macrobrachium nipponense) from Alagol wetland in January 2016. The water and sediment samples were collected by Ruttner bottle and Ekman grab, respectively. Shrimps were randomly caught using a Funnel Trap and then transported to the laboratory. The concentrations of heavy metals in samples (shrimp, water and sediment) were measured by GF-AAS and Flame-AAS. In this study, the mean concentrations of Zn, Cd and Pb in the water were 0.04, 0.08 and 0.11 mg/L and also, for sediment samples were as 1.87, 0.1 and 1.49 mg/kg, respectively. Mean concentrations of Zn, Cd and Pb in muscle of shrimp were measured 29.24, 0.58 and 2.81 mg/kg dry weights, respectively. Zn concentrations in the water were below the maximum permissible limit of the World Health Organization, but the concentration of Pb and Cd in water exceeded the permissible limit proposed by the WHO. In the present, the Zn, Pb and Cd concentrations in the sediment were lower than the mean values determined by WHO for the world sediments and crust limits. Pb in the muscle of shrimp exceeded the permissible limit proposed by the WHO, but Zn and Cd concentrations in the muscle of shrimp were below the maximum permissible limit of the WHO. The results of this study showed that the Alagol wetland is threatened by heavy metals particularly Cd and Pb.
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Volume 9, Issue 1 (6-2017)
Abstract
The purpose of this study was to describe the health effects of heavy metals in seafood dominates the household basket and tourists residents of all ages (children, adults and women) on the outskirts of the Anzali wetland using the Spectrophotometry method. The results indicated that the highest and the lowest concentrations of lead in Esox lucius fish muscle was 2.56± 0.06 mg/g dry weight) and cadmium (0.1± 0.09 mg/g dry weight) in Chalcalburnus chalcoides and the following relationship Cd
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Volume 10, Issue 1 (5-2018)
Abstract
The present study intended to investigate the bioaccumulation of toxic (lead, cadmium, mercury, arsenic, chromium) and non-toxic (copper, iron and zinc) metals in edible (muscle) and inedible (gills) tissues of Rutilus frisii kutumin the southern coast of the Caspian Sea. The samples of Kutum were caught from 6 sites. Metals extracted from the tissue using nitric acid digestion method. Then the heavy metals were measured using the device for plasma atomic spectroscopy (ICP-AES). The accumulation of heavy metals Pb, Cd, Hg, As, Cr, Cu, Fe, Zn, in muscle 22.6, 3, 4.5, 4.79, 227, 402, 10680, 6843 and in gills 50.2, 7.3, 4.8, 14.3, 469, 405, 57400, 21323 (μg /kg) dry weight were respectively. The results showed that metal accumulation was significantly different among the tissues and was found to follow the order: gill>muscle (P<0.05). Pearson's correlation coefficient showed that the accumulation of As and Cd uptake in tissues had a significant direct relationship with the uptakes with weight and length indicators. Between the accumulation of heavy metals mercury, arsenic, copper, lead, arsenic in the muscle tissues of fish, significant positive correlation was found. Comparison of heavy metals accumulation in muscle tissue was lower from the World Health Organization's declaration of heavy metals, lead, cadmium, mercury, arsenic, chromium, copper, iron and zinc were 0.4, 0.2, 0.5, 0.2, 1.3, 10, 100, 100 (μg /g) respectively. Therefore, the accumulation of heavy metals in whitefish is very low and this fish is not toxic for human consumption.
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Volume 10, Issue 1 (5-2018)
Abstract
This study was done for measuring concentration of heavy metals nickel, cadmium and lead in the muscle of Argyrosomus hololepidotus and Rachycentron canadum from the Oman Sea (Chabahar Bay) in spring, summer and fall, 2013. In this study, 48 samples of fish were prepared of coastal and marine from Oman Sea (Chabahar Bay). Metals were extracted from the tissues using wet digestion method and concentration of heavy metals measured by Atomic Absorption Spectrophotometer Younglin AAS8020. Concentration of Cd, Pb and Ni in the two fish from coastal zone was higher than marine area. Concentration of heavy metals in the muscle of Argyrosomus hololepidotus and Rachycentron canadum in summer was higher than spring and fall. Concentration of Ni in the two fish was higher than Cd and Pb. Concentration of Cd, Pb and Ni in the muscle of Argyrosomus hololepidotus from coastal and marine zone in spring, summer and fall was higher than Rachycentron Canadum. Concentration of Cd and Pb was lower than comparison of FAO, WHO, UKMAFF, NHMRC and FDA, but concentration of Ni was higher than comparison of Global Standards.
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Volume 10, Issue 3 (11-2018)
Abstract
Environmental pollution by heavy metals is one of the critical issues due to its toxic nature and persistent characters. Heavy metals in marine environments originate from both natural processes as well as anthropogenic activities. They are non-biodegradable, tending to rapidly accumulate in the environment and are able to reach toxic levels within a short span, while its removal is rather difficult or sometimes being impossible. Therefore, research on the heavy metals concentrations in marine ecosystems can help to protect human health and reduce the risks of heavy metal contaminations. In this study, in order to evaluate the concentrations of heavy metals (Zn, Cu, Pb, Co, Ni and Cd) in seawater and in algae, samples of water and algae (Spirogyra. Sp) samples from 12 stations in the southern Iranian coasts of the Caspian Sea were collected and analyzed in summer 2015. Voltammeter and atomic absorption spectroscopy techniques were used to analyze heavy metals in digested samples. The concentration of heavy metals in water and algae samples followed the order; Zn > Cu > Ni > Pb > Co > Cd. In water samples, the elements; Zn (18.38) and Cd (0.6) were found to be the highest in the western zone, Pb (3.09) and Cu (18.92) in the eastern coasts and Ni (6.93) and Co (2.36) μg L-1 in the central zone. While in algae samples; Zn (12.90), Co (0.21) and Cd (0.21) were the highest in central zone, the highest Ni (0.18) and Pb (0.14) was detected in western and Cu (0.27) mg kg-1 in the eastern coasts of the Caspian Sea. The results from metal concentrations in seawater also showed that lower than the standard limit of World Health Organization (WHO) and metals Zn, Pb and Cu were higher than Russian system of chemicals management standards (RSCM) as well as the State Environmental Protection and Administration of China (SEPA). Heavy metal bioaccumulation factor (BAF) in Spirogyra. sp followed by Zn (1150) > Co (163) > Pb (44) > Cu (36) > Cd (33) > Ni (27) which indicates the ability of algae for high adsorption levels of heavy metals. The Caspian coast is polluted with zinc, copper and lead metals. Most of this pollution is due to the presence of agricultural, industrial, and household waste.
Abdol Hossein Doulah, Razagh Obeidi,
Volume 11, Issue 1 (4-2019)
Abstract
The present research was carried out with the aim of measuring the levels of the heavy metals Cu, Zn and Fe in the muscle tissues of the Acanthopagrus cuvieri in Bushehr port. To this end, 30 A. cuvieri with an average of 840.73±156.101 gr and 34.28±3.089 cm were hunted in spring 2018. The samples were washed with distilled water and a portion of the pure muscle tissues was isolated. After dehydrating the tissues and discharging the water in the intertextual space, 0.5 gr of the powdered tissue sample was isolated and the acid digestion of the samples was carried out using 5 ml of concentrated nitric acid. To measure the levels of the heavy metals Cu, Zn and Fe a (Perkin Elmer 3030) atomic absorption spectrophotometer was employed. The results of measuring the concentrations of the heavy metals Cu, Zn and Fe in the muscle tissues of the A. cuvieri suggested that the mean and standard deviation were (6.32±0.22, 61.12±0.14 and 4.86±0.36) mg/kg dry weight during spring, respectively. The results of this study revealed that the Cu and Zn concentration in muscle tissues of A. cuvieri in study station were lower than the levels permitted within the standards of World Health Organization (WHO), Food and Agricultural Organization (FAO), National Health and Medical Research Council (Australia) (NHMRC), Ministry of Agriculture and Forestry and Fisheries UK (MAFF). But Fe concentration in muscle tissues of Acanthopagrus cuvieri in study station was higher than the level permitted within the standard of Food and Drug Administration (FDA). Hence, these two species will not pose severe general health risks to human consumers.
Morteza Beygi Malekabadi, Rasool Zamani-Ahmadmahmoodi, Ruhollah Rahimi, Hajar Ebrahimi,
Volume 11, Issue 1 (4-2019)
Abstract
Algae are among the aquatic organisms that are severely exposed to increasing levels of pollutants, which are becoming a concern in marine ecosystems. Heavy metals are among the compounds for which their increase in high levels causes problems in the structure of algae communities in aquatic ecosystems. In this study, the effect of different concentrations of Nickel (1.5, 3, 4, 6, 8, 12, 15 mg/l) and cobalt (1.5, 2, 3, 5, 6, 8, 10 mg/l) on chlorophyll a and the carotenoid level of microalga Nannochloropsis oculata was investigated for 72 hours. The EC50 of nickel and cobalt were determined according to the OECD 2011 protocol. The results of acute tests showed that EC50 of nickel and cobalt was 6.5 mg/l and 5.3 mg/l, respectively. Overall, the results of this study showed that nickel caused toxicity in higher concentrations compared to cobalt. Furthermore, nickel and cobalt heavy metals significantly inhibited the growth and reproduction of N. oculata. However, these heavy metals had lower effect on ceratoid contents.
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Volume 11, Issue 2 (7-2019)
Abstract
The Ciric and Khore Azini international wetland is the only unique habitat of Rizophora mucronata in Iran. Due to the limited access and difficulty of sampling, a study has not been done about the amount of heavy metal contamination in the plant community in this region. For this purpose, in 2016, 27 sediments, leaves and roots were sampled from 9 stations with three replications at each station by boats. After extraction, lead and nickel concentrations were measured by atomic absorption. The mean (±SD) lead and nickel concentrations in sediment were 13.06 ± 2.62 and 63.82 ± 6.99, in the leaves 4.24 ± 2.22 and 2.96 ± 0.57 and in the root 9.12 ± 2.52 and 8.57 ± 4.29 mg/kg dry weight, respectively. The mean lead and nickel concentrations in leaves and roots also, the mean nickel concentration in the sediments is higher than the standard threshold. According to the muller index, lead and nickel concentrations are in the non-contaminated class and based on the pollution coefficient, have a moderate contamination coefficient. The lead and nickel contamination attributed to the fishing boat and vessels, oil discharging, gas and petrochemical industries on the coastline. Due to the mean nickel concentrations in sediments, leaves and roots in this region and due to the economic and ecological importance of mangrove habitats and their vulnerability, it is necessary that the heavy metals pollution in this area to be controlled and monitored.
