scholarly journals Determination of Mercury Accumulation Factor in Hard Clam (Meretrix lyrata) at Bach Dang Estuary, Viet Nam

2016 ◽  
Vol 6 (3) ◽  
pp. 18 ◽  
Author(s):  
Le Xuan Sinh
Keyword(s):  
Methyl Mercury ◽  
Total Mercury ◽  
Bioaccumulation Factor ◽  
Hard Clam ◽  
Accumulation Factor ◽  
Mercury Accumulation ◽  
Viet Nam ◽  
Allowable Limit ◽  
Mercury Compounds

<p class="1Body">Bach Dang estuary (Hai Phong City) is one of the developed economic centers of Hai Phong city with abundance of natural resources. At the Bach Dang estuary, waste sources of mercury compounds discharge from the industrial sources, transportation sources, port, agricultural sources and living sources. Two forms of mercury: total mercury and methyl mercury in the water at the Bach Dang estuary are lower than the allowable limit. Bioaccumulation factor (BAF) of total mercury in hard clam <em>Meretrix lyrata</em> is 307 and that one of methyl mercury is 165,000.</p>

Rapid Semimicro Method for the Determination of Methyl Mercury in Fish Tissue

1972 ◽  
Vol 55 (3) ◽  
pp. 583-589 ◽  
Author(s):  
J F Uthe ◽  
J Solomon ◽  
B Grift
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Aqueous Ethanol ◽  
Fish Tissue ◽  
Mercuric Iodide ◽  
Mercury In Fish ◽  
Layer Chromatography

Abstract A fast semimicro method for the determination of methyl mercury in fish tissue is described. The procedure involves extracting the methyl mercury into toluene as methyl mercuric bromide, partitioning the bromide into aqueous ethanol as a thiosulfate complex, and re-extracting into benzene as methyl mercuric iodide. Methyl mercury is quantitated with gas chromatography. The method is sensitive to 0.01 ppm. Recoveries of added methyl mercury were 99% and the presence of methyl mercury in the final extract was shown by thin layer chromatography and gas chromatography of the thin layer spot. A variety of mercurial compounds do not interfere in the analyses. The amounts of both methyl and total mercury found in a variety of tissues of aquatic animals are compared. The presence of a demethylase in seal is suggested by the findings of high levels of nonmethyl mercury. Additional cleanup by column chromatography on Florisil was necessary with certain samples. The gas chromatographic columns were kept operational by the intermittent injection of 3M potassium iodide. Due to column bleed and resulting detector contamination, the use of the easily cleaned concentric tube electron capture detector is recommended.

Determination of Methyl Mercury in Fish by Flameless Atomic Absorption Spectroscopy and Comparison with an Acid Digestion Method for Total Mercury

1976 ◽  
Vol 59 (1) ◽  
pp. 153-157
Author(s):  
Jurgen L Kacprzak ◽  
Ramon Chvojka
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Flameless Atomic Absorption ◽  
Flameless Atomic Absorption Spectroscopy ◽  
The Difference

Abstract A method for the concurrent determination of methyl mercury and inorganic mercury by flameless atomic absorption spectroscopy (AAS) is described. Fifty-seven samples of juvenile black marlin fish were analyzed for inorganic and methyl mercury, and total mercury was calculated by addition of the 2 values. The sensitivity of the method was estimated to be 0.029 μg for inorganic mercury and 0.033 μg for methyl mercury. The detection limit of the method was about 0.02 μg inorganic mercury or methyl mercury and the error of the method was found not to exceed 10% for samples giving about 10% deflection on the absorbance scale. Samples from the same fish were analyzed by a commonly accepted flameless AAS method for the determination of total mercury. When the results for total mercury from the 2 methods were statistically compared, using a paired t-test, the difference between the results obtained by the 2 methods was found to be insignificant at the 95% confidence level.

THg and MeHg in Water Bodies of Xiaolangdi Reservoir of Yellow River, China

2011 ◽  
Vol 347-353 ◽  
pp. 2413-2418
Author(s):  
Zhong Wei Huang ◽  
Shun Lin Tang ◽  
Jun Liu ◽  
Qiao Li Liu ◽  
Tao Wang
Keyword(s):  
Residence Time ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Yellow River ◽  
Important Variable ◽  
Main Channel ◽  
Water Bodies ◽  
Mercury Accumulation ◽  
Water Residence Time ◽  
Xiaolangdi Reservoir

We conducted two campaigns to study total mercury (THg) and methyl mercury (MeHg) in water bodies of Xiaolangdi reservoir, which were constructed in 2001 and drained for desilification in early June every year. The first campaign was conducted in May 2010 and 7 sampling sites were selected from upstream to the dam. The second campaign was conducted in Nov. 2010 and 3 sampling sites were selected in Nov.2010. Our results showed that the average THg(30.5ng/L) concentration of water bodies in main channel of xiaolangdi reservoir was higher that of in tributary (19.3ng/L) and declined from upstream to downstream water body. Drainage of reservoir could decline mercury in water and water residence time was an important variable affecting mercury accumulation. The MeHg concentration had the same trend compared to THg from upstream to downstream water bodies. Mingzhudao, luoyu and dam water bodies were 0.045ng/L, 0.039ng/L and 0.037ng/L water bodies, respectively.

scholarly journals Bioaccumulation of mercury in clams (Meretrix lyrata) cultured atthe Bach Dang estuary: a recommendation for safe daily dosage consumption of clams in Vietnam

2020 ◽  
Vol 58 (4) ◽  
pp. 493
Author(s):  
Le Xuan Sinh ◽  
Mai Huong
Keyword(s):  
Total Mercury ◽  
Bioaccumulation Factor ◽  
Mercury Contamination ◽  
Intertidal Area ◽  
Allowable Limit ◽  
Four Seasons ◽  
One Year

This study assessed the level of mercury (THg) and methylmercury (MeHg) in seawater and clams (Meretrix lyrata) during all four seasons (July 2010 to May 2011) at the Dong Bai intertidal area in the Bach Dang estuary. The results showed that total mercury and methyl mercuryconcentrations of the water were under the allowable limit. Total mercury and methylmercury concentration for clams ranged from 12.5-87.9 ng/g dw and 1.1-24.6 ng/g dw, respectively. The highest bioaccumulation factor (BAF) of Meretrix lyrata was 303.2 for mercury and 165,000 for methylmercury. The recommended safe dosage for daily clam consumption depends on the season. Over a one-year period, mercury contamination in clams harvested in the Bach Dang estuary ranged from 1.4 to 38.1 g/kg bw. It is not recommended to consume too many clams in March or April.

Mercury in the Sudbury River (Massachusetts, U.S.A.): pollution history and a synthesis of recent research

2000 ◽  
Vol 57 (5) ◽  
pp. 1053-1061 ◽  
Author(s):  
James G Wiener ◽  
Pamela J Shields
Keyword(s):  
Contaminated Soils ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Sediment Cores ◽  
Inorganic Mercury ◽  
Dry Weight ◽  
Mercury Accumulation ◽  
Industrial Complex ◽  
Pollution History ◽  
Industrial Operations

We review the transport, fate, and bioavailability of mercury in the Sudbury River, topics addressed in the following five papers. Mercury entered the river from an industrial complex (site) that operated from 1917 to 1978. Rates of mercury accumulation in sediment cores from two reservoirs just downstream from the site decreased soon after industrial operations ended and have decreased further since capping of contaminated soils at the site in 1991. The reservoirs contained the most contaminated sediments (some exceeding 50 μg Hg·g dry weight-1) and were depositional sinks for total mercury. Methyl mercury concentrations in biota did not parallel concentrations of total mercury in the sediments to which organisms were exposed, experimentally or as residents. Contaminated wetlands within the floodplain about 25 km downstream from the site produced and exported methyl mercury from inorganic mercury that had originated from the site. Natural burial processes have gradually decreased the quantity of sedimentary mercury available for methylation within the reservoirs, whereas mercury in the lesser contaminated wetlands farther downstream has remained more available for transport, methylation, and entry into food webs.

Atomic Absorption Determination of Total, Inorganic, and Organic Mercury in Blood

1972 ◽  
Vol 55 (5) ◽  
pp. 966-971 ◽  
Author(s):  
Laszlo Magos ◽  
Thomas W Clarkson
Keyword(s):  
Atomic Absorption ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Mean Deviation ◽  
Organic Mercury ◽  
Absorption Determination ◽  
The Difference ◽  
Mercury In Blood

Abstract The atomic absorption method described will determine total mercury and, selectively, inorganic mercury. Organic mercury is measured as the difference between total and inorganic mercury. Lower levels of mercury in samples of human blood (4.1 ng Hg/ml) can be determined with the following precision: total mercury 0.6%, inorganic mercury 8.7%, and organic mercury 5.6%. The mean deviation of 2 sets of analyses, one carried out with the method described in this paper and the other with neutron activation analysis, was 3.6%. Organic (presumably methyl) mercury accounted for 66% of the total mercury in blood in a population with minimum exposure. The red cell-to-plasma ratio of organic (methyl) mercury averaged 13.9 in a population with moderate exposure to mercury in food.

Gas Chromatographic Determination of Methyl Mercury in Fish, Sediment, and Water

1973 ◽  
Vol 56 (6) ◽  
pp. 1297-1303 ◽  
Author(s):  
James E Longbottom ◽  
Ronald C Dressman ◽  
James J Lichtenberg
Keyword(s):  
Water Samples ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Chromatographic Determination ◽  
Chloride Salt ◽  
Mercury In Fish ◽  
Cleanup Procedure ◽  
Very High

Abstract Methyl mercury is extracted as the bromide salt from fish and sediment and as the chloride salt from water samples. All extracts are treated with a common cleanup procedure that results in the conversion of methyl mercury to the iodide salt for electron capture gas chromatographic analysis. Recoveries ranged from an average of 88.5% for water samples to averages of 95.5 and 96.3% for perch and sediments. Methods for controlling contaminants and interferences are discussed for all phases of the method. Particular problems encountered were column poisoning and detector poisoning. When the method was applied to sediment samples collected from a polluted river, a correlation could be established between total mercury and methyl mercury when the concentration of total mercury was in the 0–10 μg/g region. For samples of very high inorganic mercury, the correlation failed.

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