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1.
Osuna-Martínez CC Páez-Osuna F Alonso-Rodríguez R 《Bulletin of environmental contamination and toxicology》2011,87(3):272-275
In order to determine the metal concentrations in cultured oysters from four coastal lagoons from SE Gulf of California, several
individuals of Crassostrea gigas and C. corteziensis were collected and their cadmium, copper, lead and zinc levels were measured by atomic absorption spectrometry after acid
digestion. The concentration of metals in oyster soft tissue was Zn > Cu > Cd > Pb. In two lagoons, Cd concentrations (10.1–13.5 μg g−1 dw) exceeded the maximum level allowed according to the Official Mexican Standard (NOM-031-SSA1-1993), which is equivalent
to the WHO recommended Cd levels in organisms used for human consumption. 相似文献
2.
Kazemi A Bakhtiari AR Kheirabadi N Barani H Haidari B 《Bulletin of environmental contamination and toxicology》2012,88(1):100-103
This study was performed to determine the variation of metals concentrations (Pb, Cd, Zn, and Cu) in surface sediments based
on type region development from ten sites on the intertidal coastal zone of the Persian Gulf, Iran. The metals concentrations
in surface sediments varied from 0.86 to 180.78 μg g−1 for Pb, 0.61 to 6.48 μg g−1 for Cd, 5.99 to 44.42 μg g−1 for Zn, and 3.01 to 43.33 μg g−1 for Cu. The quality of the sediments was evaluated based on sediment quality guidelines (effects range-low (ERL) and effects
range-medium (ERM) indexes. Biological effects criteria suggest that metals concentrations in sediments were lower than ERM
for all sites, but for some sites metals concentrations in sediments were higher than ERL. The present results support the
concept that human activities in each region could be a major source of metals pollution input in the aquatic environment. 相似文献
3.
Olivares-Rieumont S Lima L Rivero S Graham DW Alonso-Hernandez C Bolaño Y 《Bulletin of environmental contamination and toxicology》2012,88(4):589-593
Total mercury levels were quantified in sediments and oyster tissues (Crassostrea rizophorae) from the Sagua la Grande River estuary and offshore mangrove keys 19 km downstream of a chlor-alkali plant (CAP) in Villa
Clara, Cuba. Relatively elevated total mercury levels were found in sediments from the estuary itself, ranging from 0.507
to 1.81 μg g−1 dry weight. However, levels were lower in sediments from the keys farther from the estuary. Oyster mercury levels were always
acceptable for human consumption, although levels significantly correlated in sediments and oysters across sampling sites
(p < 0.05), which suggests that mercury from the CAP is impacting coastal water quality conditions. 相似文献
4.
Sajwan KS Kumar KS Paramasivam S Compton SS Richardson JP 《Archives of environmental contamination and toxicology》2008,54(2):245-258
Sediment and American oyster (Crassostrea virginica) collected from nine selected marsh/estuarine ecosystems in Savannah, Georgia were analyzed for elements such as Al, As,
B, Cd, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Si, and Zn. Sediments were extracted by ammonium acetate (NH4OAc), Mehlich-3 (M-3), and water procedures, whereas an acid digestion procedure was adopted for oyster tissue. Concentrations
of elements were higher in M-3 extractions followed by NH4OAc and water extraction procedures. Calcium and Mg was greater in sediments by any of the extractions, whereas other elements
differed depending upon the extraction procedures. There were no significant spatial variations (p < 0.05) of any of elements analyzed except Mn, in NH4OAc/water extraction procedure and Fe and Al by water extraction procedure. Contamination of Al, B, Cd, Cr, Cu, Fe, Mn, Mo,
Ni, Pb, Si, and Zn in oyster tissue ranged from 399 to 1460, 231 to 254, <1.5 to 2.9, <1.5 to 8.0, 67 to 121, 232 to 1357,
17 to 54, <0.5 to 0.64, <1.5 to 2.5, <1.5 to 4.0, 241 to 381, and 978 to 2428 μg/g dry weight (dw), respectively. Greatly
elevated concentrations of elements such as P, Ca, Mg, K, and S were noticed in oyster tissue. The concentration range of
Hg and As in sediment was 1.2–1.9 and 11–55 μg/g dw, respectively. The concentration range of Hg and As in oyster tissue was
130–908 and 200–912 ng/g dw, respectively. With the exception of As and Hg, other elements are several orders of magnitude
greater in oyster tissue. There is no significant (p < 0.05) contamination variation in target analyses between the nine selected sites. Concentrations of heavy metals in sediment
and oyster were either comparable or lower than those of other countries. Greater biota-sediment accumulation factor was noticed
for P and Zn. Concentrations of Hg and P in oyster tissue were higher than the threshold limit for human consumption. Overall,
the baseline data can be used for regular ecological monitoring, considering the domestic and industrial growth around this
important marsh/estuarine ecosystem. 相似文献
5.
M. G. Frías-Espericueta I. Osuna-López I. Ba?uelos-Vargas G. López-López M. D. Muy-Rangel G. Izaguirre-Fierro W. Rubio-Carrasco P. C. Meza-Guerrero D. Voltolina 《Bulletin of environmental contamination and toxicology》2009,83(4):595-599
The ranges of concentrations of Cd, Cu, Pb and Zn of the soft tissues of C. corteziensis collected in seven coastal lagoons of NW Mexico were 1.55–7.45, 17.50–166.36, 4.13–9.49 and 245.34–2,304.12 μg/g (dry weight),
respectively. Their distributions were not consistent and there were no seasonal trends, indicating different point sources
of the metals in each lagoon. The mean Cd and Pb concentrations were 5.34 and 6.30 μg/g (dry weight), which are higher than
the values indicative of polluted areas. Our data indicate that only the levels of Cd are a possible health risk in six of
these lagoons, and only in the case of regular local consumers. In one, Cu and Zn reach levels of concern. 相似文献
6.
Frías I Rubio C González-Iglesias T Gutiérrez AJ González-Weller D Hardisson A 《Bulletin of environmental contamination and toxicology》2008,80(1):30-33
Ashes and contents of Zn, Cu, Fe, Cd and Pb in 140 fresh honey samples from three different areas of Tenerife Island were
determined by inductively coupled plasma atomic emission spectrometry and graphite furnace atomic absorption spectrometry.
A mean ash content of 0.35% has been determined. The mean Fe, Cu, Zn, Pb and Cd concentrations observed have been 3.37 mg kg−1, 1.28 mg kg−1, 2.83 mg kg−1, 37.33 μg kg−1, 4.38 μg kg−1, respectively. A direct statistical correlation has been found between the Fe–Zn and Fe–Pb content, and between the Cd–Zn
and Cd–Pb levels. 相似文献
7.
Concentrations of the macroelements Ca, Mg, K and Na, microelements Cr, Cu, Fe, Mn and Zn and toxic metals As, Cd, Hg and Pb were determined in oysters and mussels collected at farming sites in the northern, central and south Adriatic Sea. Mean concentrations in oysters were (mg kg−1): As 4.51, Ca 1551, Cd 1.44, Cu 53.6, Cr 0.23, Fe 45.9, Hg 0.047, K 2476, Mg 895, Mn 2.80, Na 7148, Pb 0.52, Zn 675. Mean values in mussels were (mg kg−1): As 4.71, Ca 601, Cd 0.37, Cu 1.91, Cr 0.29, Fe 49.6, Hg 0.026, K 2246, Mg 1043, Mn 2.49, Na 7992, Pb 0.58, Zn 28.8. Significant differences in the concentrations of toxic metals and elements were found in oysters and mussels among farming sites. Obtained Cd, Hg and Pb concentration in oysters and mussels were lower than the limit levels set by the European Community. However, Cd concentration exceeded the limit level of 1 mg kg−1 in oysters from all locations except Lim Bay. The estimated daily intakes (EDIs) indicate that oysters are a good source of Ca, Cu and Zn. The higher Cu and Zn concentrations than the toxicity reference values suggest a risk for consumers if larger quantities of oysters are consumed frequently. 相似文献
8.
B. C. Han W. L. Jeng M. S. Jeng L. T. Kao P. J. Meng Y. L. Huang 《Archives of environmental contamination and toxicology》1997,32(4):456-461
This study presents the distribution of arsenic (As), copper (Cu), and zinc (Zn) in various seafoods—oysters (Crassostrea gigas), false fusus (Hemifuscus tuba), venus clams (Cyclina sineasis), green mussels (Perna viridis), blood clams (Arca granosa), flounders (Psettodes erumei), and rock-shells (Thais clavigera) collected from the Putai coast of the black-foot disease (BFD) area in Taiwan. Special attention is paid to evaluate the
relationships among As, Cu, and Zn and effect of body size on metal concentration in Thais clavigera. Maximum Zn and Cu geometric mean (GM) concentrations (GM = 615 and 376 μg/g, dry wt, respectively) are found in oysters (Crassostrea gigas), and the values are much higher than those of the other organisms by about 1.7–208 and 1.8–375 times, respectively. Similarly,
Thais clavigera has a high capacity for accumulating Cu and Zn collected from the same location. One interesting point is that relatively
high As concentrations (GM = 65.7 μg/g, dry wt) in Thais clavigera are found as compared with those in other organisms (range from GM = 2.37 to 40.2 μg/g, dry wt). The As concentrations are
significantly higher in Thais clavigera (1.62–27.7 times) than those in other organisms (p < 0.05), except for the false fusus (Hamifuscus tuba). A linear regression analysis shows a significant increase in Zn concentration with increasing Cu concentration in Thais clavigera. On the other hand, the As concentration is correlated with Cu and Zn concentrations (r = 0.77 and 0.77, respectively; p < 0.05) in Thais clavigera. Double logarithmic plots of metal content and concentration against dry-body weight and shell length show linear relationships.
The result indicates that large individuals have higher contents of Cu, Zn and As, and have slopes of 1.58, 1.38, and 1.34,
respectively. In addition, metal concentrations against shell length for all animal sizes also indicate that Cu, Zn and As
have slopes of 1.92, 1.18, and 1.11, respectively. In conclusion, Thais clavigera has a high capactiy for accumulating As, Cu, and Zn and is a potential bioindicator for monitoring As, Cu and Zn.
Received: 8 February 1996/Revised: 15 June 1996 相似文献
9.
O. Díaz Rizo S. Olivares Reumont J. Viguri Fuente O. Díaz Arado N. López Pino K. D’Alessandro Rodríguez D. de la Rosa Medero A. Gelen Rudnikas G. Arencibia Carballo 《Bulletin of environmental contamination and toxicology》2010,84(1):136-140
Levels of iron, copper, zinc and lead were determined in sediments and soft tissue of the oyster Crassostrea rhizophorae collected from Guacanayabo Gulf, Cuba. Metal-to-Iron ratio in sediments shows an average enrichment for Cu (5,1), Pb (11,7)
and Zn (1,3) in the last 20 years. Metal concentrations found in soft tissue of C. rhizophorae are site dependent. The average biota-sediment accumulation factors (BSAFs) obtained for Fe, Cu and Pb are less than unity
in all cases, indicating that only a little fraction of Cu and Pb in the sediments is bioavailable, independently of their
enrichments. Zinc has an average BSAF value of 2.4 and may represent a serious impact in the area. The concentrations of zinc
and copper in some of the oysters are above typical public health recommended limits. 相似文献
10.
Ongeri DM Lalah JO Wandiga SO Schramm KW Michalke B 《Bulletin of environmental contamination and toxicology》2012,88(2):166-171
Trace metals Cadmium (Cd), Lead (Pb), Copper (Cu), Zinc (Zn) and Iron (Fe) were analyzed in edible portions of three main
finfish species namely Lates niloticus, Oreochromis niloticus and Rastrineobola argentea sampled from various beaches of Winam Gulf, Lake Victoria, Kenya, in order to determine any seasonal and site variations
and the results showed significantly (p < 0.05) higher mean concentrations of Cd, Cu, Zn and Fe during the wet season compared to the dry season for all the three
species indicating the impact of wash-off into the lake during the rainy periods. The overall mean concentrations of the heavy
metals (in μg/g dry weight) in all combined samples ranged from 0.17–0.40 (Cd), 0.47–2.53 (Pb), 2.13–8.74 (Cu), 28.9–409.3
(Zn) and 31.4–208.1 (Fe), respectively. It was found that consumption of Rastrineobola argentea can be a significant source of heavy metals especially Zn, to humans, compared with Lates niloticus and Oreochromis niloticus, if only the muscle parts of the latter two are consumed. 相似文献
11.
Szefer P Zdrojewska I Jensen J Lockyer C Skóra K Kuklik I Malinga M 《Archives of environmental contamination and toxicology》2002,42(4):508-522
The concentrations of selected metals such as Cd, Pb, Cu, Zn, Cr, Ni, Mn, and Fe were determined in liver, kidney, and muscle
of harbor porpoise (Phocoena phocoena) from three geographical regions, i.e., the Baltic Sea and Danish and Greenland coastal waters. The concentrations of Cd in liver and kidney increased with age
of the specimens analyzed. Significant interspatial variations in both hepatic and renal levels of Cd were also observed.
Average hepatic levels of Cd in Baltic, Danish, and Greenland specimens were (age range) 0.05–0.09, 0.12–0.25, and 20.6–51.6
μg g−1 dry weight, respectively. Such values for renal Cd were as follows: 0.55–0.71, 0.14–1.84, and 0.55–94.3 μg g−1 dry weight. In contrast to Cd, concentrations of Cu in the liver and kidney of specimens from Baltic, Danish, and Greenland
areas did not indicate such great interspatial variability. The average hepatic values amounted to (age range) 14.1–15.5,
22.1–63.6, and 16.3–25.9 μg g−1 dry weight, and kidney contained on the average 7.83–8.80, 11.7–16.2, and 11.1–15.7 μg Cu g−1 dry weight, respectively. The higher levels of hepatic and renal Cd in Greenland specimens than in Baltic ones could be explained
by different food composition in the area studied. Baltic porpoises mainly feed on fish (cod, plaice) containing extremely
low levels of muscle Cd, but an important diet component of Greenlandic individuals is squid, characterized by elevated levels
of Cd.
Received: 22 May 2001/Accepted: 11 November 2001 相似文献
12.
Bouilly K Bonnard M Gagnaire B Renault T Lapègue S 《Archives of environmental contamination and toxicology》2007,52(1):58-63
Diuron is a substituted urea herbicide used for agricultural and nonagricultural weed control. Its widespread use and relatively
slow breakdown led us to analyze its influence on aneuploidy level (lowered chromosome number in a percentage of somatic cells)
and hemocyte parameters in Pacific oysters, Crassostrea gigas. Adult oysters were subjected to two diuron concentrations (300 ng L−1 and 3 μg L−1) for 11 weeks. Significantly higher aneuploidy level was observed in diuron-treated oysters compared with the control. Furthermore,
the observed impact on aneuploidy persisted to the next generation as offspring exhibited significantly higher aneuploidy
levels when their parents had been exposed to diuron. Significant increases in hemocyte parameters (cell mortality, phagocytosis,
granulocyte percentage, reactive oxygen species, and lysosome presence) of the adults were also observed after 4 weeks of
diuron exposure. The effects observed on oyster aneuploidy level and hemocyte parameters could have serious environmental
and practical consequences. 相似文献
13.
Bulk and Bioavailable Heavy Metals (Cd,Cu, Pb,and Zn) in Surface Sediments from Mazatlán Harbor (SE Gulf of California) 总被引:1,自引:0,他引:1
Jara-Marini ME Soto-Jiménez MF Páez-Osuna F 《Bulletin of environmental contamination and toxicology》2008,80(2):150-153
This work evaluates current metal concentrations (Cd, Cu, Pb and Zn) and the operational bio-available chemical extraction
fraction in surface sediments in Mazatlán Harbor in Northwest México. Sediment samples were also analyzed for organic carbon,
carbonates and particle size. Ranges of bulk metal were as follows: Cd from 3.1 to 3.3 μg/g, Cu from 31.9 to 44.9 μg/g, Pb
from 49.6 to 54.0 μg/g, and Zn from 217.8 to 323.5 μg/g. In terms of biological effects, metals concentrations in the sediments
lie between the low and median ranges of the mean quality guideline criteria. Comparatively, the metals concentrations increased
from 1983 to 1994 and then for 2006, except Pb and Cd that decreased in the last period of time. The bio-available fraction
of metals increased from 1983 to 1994, but only bio-available Cu increased from 1994 to 2006, due to mobilization of this
metal from the organic matter–sulfide phase. 相似文献
14.
C. K. King M. C. Dowse S. L. Simpson 《Archives of environmental contamination and toxicology》2010,58(3):657-665
The Australian benthic bivalve Tellina deltoidalis tolerates a wide range of sediment and water conditions, is easy to handle in the laboratory, and is a useful species for
undertaking whole-sediment toxicity tests. The sensitivity of T. deltoidalis to metals was investigated in 10-day metal-spiked sediment exposures for Cd, Cu, Ni, Pb, and Zn and in water-only exposures
for Cu and Zn. The survival of T. deltoidalis in 10-day exposures to metal-spiked sediments was 88–100% for Cd, Ni, Pb, and Zn concentrations of 75, 420, 1,000, and 4,000 mg/kg,
respectively. The 4-day LC50s for dissolved Cu and Zn were 0.18 and 13 mg/L, respectively. The 8-day LC50 for Cu was 31 (24–34) μg/L. Cu and Zn concentrations in the tissues of T. deltoidalis increase linearly with increasing dissolved exposure concentration. In the Cu-spiked sediment and water exposures, the survival
was negatively correlated with the Cu concentration in both the overlying water and in the tissues of T. deltoidalis. In contrast, particulate Cu concentrations were found to be a poor predictor of Cu bioaccumulation and toxicity for Cu-spiked
sediments. 相似文献
15.
Langner HW Greene E Domenech R Staats MF 《Archives of environmental contamination and toxicology》2012,62(4):681-695
We investigated links between mining-related contaminants in river sediment and their occurrence in nestling ospreys (Pandion haliaetus) in the Clark Fork River Basin, Montana, USA. Blood and feather samples from 111 osprey chicks were collected during 4 years
from nests along river sections with greatly different sediment concentrations of arsenic (As), cadmium (Cd), copper (Cu),
lead (Pb), zinc (Zn), and mercury (Hg). No significant differences between river sections were found among Zn (3,150 ± 160 μg
L−1) and Cd (<5 μg L−1) concentrations in blood. Cu, Pb, and As concentrations in blood were significantly increased in chicks from the most contaminated
river sections (mean values of 298, 8.9, and 100 μg L−1, respectively). Cu, Zn, and Pb concentrations increased significantly during a year of above-average river runoff combined
with high suspended sediment loads in rivers. Total Hg concentrations in blood and feathers were highly correlated and depended
on the geographic locations of the nests. The lowest blood concentrations of Hg were observed in the most upstream river section
(mean 151 μg L−1) where total sediment concentrations were increased (0.80 mg kg−1). River sections with intermediate blood concentrations (mean 206 and 303 μg L−1) were associated with low to intermediate sediment concentrations (0.058 and 0.46 mg kg−1). The highest concentrations of Hg in ospreys (mean 548 μg L−1) were observed downstream from a contaminated tributary (1–4 mg kg−1 in sediment). In river sections with lower Hg concentrations in sediment, there was a negative correlation between blood
Hg concentration and chick mass, presumably due to high deposition rates into growing feathers. This relationship was absent
in sections of high Hg exposure. Osprey blood and feathers are suitable for monitoring Hg in aquatic ecosystems; however,
responses of As, Cd, Cu, Pb, and Zn are more subtle. 相似文献
16.
Salahshur S Bakhtiari AR Kochanian P 《Bulletin of environmental contamination and toxicology》2012,88(6):951-955
The concentrations of Zn, Cd and Pb were determined in tissues (shell and soft tissue) of 144 of bivalve mollusks (Solen brevis) and 15 samples of surface sediment collected from three locations in intertidal zones of Bushehr coast, Persian Gulf, Iran
in May 2011. The mean concentrations of Zn, Cd and Pb in the sediment samples were 26.2, 1.25, and 21.1 μg/g dw, respectively.
The mean levels of Zn, Cd and Pb in the clam samples were 63.3, 0.67, and 4.38 μg/g dw in soft tissue and 10. 7, 1.53, and
15.6 μg/g dw in shell, respectively. The degrees of variability (CV %) for Cd and Pb within the shells were lower than for
soft tissues, whereas the CV for Zn was lower in the soft tissue than in the shell, indicating that there is more precision
(lower CV) in the determination of Cd and Pb in the shells and Zn in the soft tissues. Significant correlation were found
between Cd (r = 0.63; p < 0.05) and Pb (r = 0.78; p < 0.01) concentrations in the shell of S.
brevis and their concentrations in the surface sediments. Indeed, Zn concentrations in the soft tissue of S. brevis significantly (r = 0.63; p < 0.05) correlated with Zn concentrations in surface sediments. The results of this study suggest that the shell of S.
brevis may serve as a reliable biomonitor for Cd and Pb, and the soft tissue for Zn. 相似文献
17.
Ochieng EZ Lalah JO Wandiga SO 《Bulletin of environmental contamination and toxicology》2007,79(5):570-576
The concentrations of heavy metals Ag, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sn and Zn were analysed in water and surface sediments
of five Rift Valley lakes Nakuru, Elementaita, Naivasha, Bogoria and Baringo in Kenya. The dissolved mean concentration levels
(μg/L) in water ranged within 13.0–185.0 (Ag), 2.0–43.0 (Cd), 5.0–316.0 (Co), 25.0–188.0 (Cr), 4.7–100.0 (Cu), 50.0–282.0
(Mn), 19.0–288.0 (Ni), 25.0–563.0 (Pb), 300.0–1050.0 (Sn) and 29.0–235.0 (Zn). The mean sediment concentrations (in μg/g (dry
weight)) ranged within 0.1–0.35 (Ag), 0.05–1.18 (Cd), 0.17–1.38 (Co), 1.94–4.91 (Cr), 1.46–20.95 (Cu), 667.7–3946.8 (Mn),
11.69–39.72 (Ni), 10.92–38.98 (Pb), 17.21–56.52 (Sn) and 96.2–229.6 (Zn). The data indicate that some of the sites analysed,
especially in Lake Nakuru, had relatively higher concentration levels of heavy metals Cd, Co, Cu, Pb, Ni, and Zn in the water
which points to anthropogenic addition. However, potential influence of geochemical processes on the concentration levels
in sediment is also shown in Co, Ni, and Cu which were more concentrated in the remote Lake Baringo sediment as well as in
Pb and Mn which were more concentrated in the remote Lake Bogoria sediment. Data on some important limnological parameters
including pH, salinity, electrical conductivity and temperature are also presented. 相似文献
18.
Chaharlang BH Bakhtiari AR Yavari V 《Bulletin of environmental contamination and toxicology》2012,88(6):956-961
The levels of Cd, Cu, Pb and Zn in surface sediment, soft tissue and shell of the oyster Saccostrea cucullata collected from three locations, in the intertidal zones of Lengeh Port, northern part of Persian Gulf were measured. Results
indicated that there were a positive correlation across Zn (r = 0.58, p = 0.025), Cd (r = 0.74, p < 0.01) and Cu (r = 0.80, p < 0.01) levels in the soft tissue of oyster and sediment which supported this fact that the soft tissue of S. cucullata can be considered as biomonitoring agent for Cd, Zn and Cu in the Lengeh Port. 相似文献
19.
A. A. Pereira B. van Hattum J. de Boer P. M. van Bodegom C. E. Rezende W. Salomons 《Archives of environmental contamination and toxicology》2010,59(3):464-477
Trace elements (Fe, Mn, Al, Zn, Cr, Cu, Ni, Pb, Cd, Hg, and As) and stable isotope ratios (δ13C and δ15N) were analyzed in sediments, invertebrates, and fishes from a tropical coastal lagoon influenced by iron ore mining and
processing activities to assess the differences in trace element accumulation patterns among species and to investigate relations
with trophic levels of the organisms involved. Overall significant negative relations between trophic level (given by 15N) and trace element concentrations in gastropods and crustaceans showed differences in internal controls of trace element
accumulation among the species of different trophic positions, leading to trace element dilution. Generally, no significant
relation between δ15N and trace element concentrations was observed among fish species, probably due to omnivory in a number of species as well
as fast growth. Trace element accumulation was observed in the fish tissues, with higher levels of most trace elements found
in liver compared with muscle and gill. Levels of Fe, Mn, Al, and Hg in invertebrates, and Fe and Cu in fish livers, were
comparable with levels in organisms and tissues from other contaminated areas. Trace element levels in fish muscle were below
the international safety baseline standards for human consumption. 相似文献
20.
C. C. Osuna-Martínez F. Páez-Osuna R. Alonso-Rodríguez 《Bulletin of environmental contamination and toxicology》2010,85(3):339-343
In order to determine the mercury concentrations in cultured oysters from coastal lagoons (SE Gulf of California), several
individuals of Crassostrea gigas and C. corteziensis were collected and their mercury levels were measured with a cold vapor analyzer. The mean concentrations during the rainy
and dry seasons, respectively, were 0.70 and 0.15 μg g−1 in C. gigas and 0.56 and 0.18 μg g−1 in C. corteziensis. During the rainy season, elevated mercury contents are apparently related to terrigen transport from the watershed, while
during the dry season, the moderate levels are related to upwellings. 相似文献