Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US
We measured mercury (Hg) isotope ratios in sediments and various estuarine organisms (green crab, blue mussel, killifish, eider) to investigate methylmercury (MMHg) sources and exposure pathways in five Northeast coast (U.S.) estuaries. The mass independent Hg isotopic compositions (MIF; Delta Hg-19...
Published in: | Environmental Science & Technology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Chemistry Society Publication
2014
|
Subjects: | |
Online Access: | https://oasis.postech.ac.kr/handle/2014.oak/41325 https://doi.org/10.1021/es5020554 |
id |
ftponangunivst:oai:oasis.postech.ac.kr:2014.oak/41325 |
---|---|
record_format |
openpolar |
spelling |
ftponangunivst:oai:oasis.postech.ac.kr:2014.oak/41325 2023-05-15T18:20:27+02:00 Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US KWON, SAE YUN BLUM, JOEL D. CHEN, CELIA Y. MEATTEY, DUSTIN E. MASON, ROBERT P. KWON, SAE YUN 2014-09-02 https://oasis.postech.ac.kr/handle/2014.oak/41325 https://doi.org/10.1021/es5020554 English eng American Chemistry Society Publication Environmental Science and Technology Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology 0013-936X https://oasis.postech.ac.kr/handle/2014.oak/41325 doi:10.1021/es5020554 30591 Environmental Science and Technology, v.48, no.17, pp.10089 - 10097 000341229300020 2-s2.0-84906879079 EIDERS SOMATERIA-MOLLISSIMA TROPHIC TRANSFER STABLE-ISOTOPES MARINE FISH FRACTIONATION HG BIOAVAILABILITY SPECIATION GULF CONTAMINATION Article ART 2014 ftponangunivst https://doi.org/10.1021/es5020554 2022-10-20T20:24:59Z We measured mercury (Hg) isotope ratios in sediments and various estuarine organisms (green crab, blue mussel, killifish, eider) to investigate methylmercury (MMHg) sources and exposure pathways in five Northeast coast (U.S.) estuaries. The mass independent Hg isotopic compositions (MIF; Delta Hg-199) of the sediments were linearly correlated with the sediment 1/Hg concentrations (Delta Hg-199: r(2) = 0.77, p < 0.05), but the mass dependent isotope compositions (MDF; delta Hg-202) were not (r(2) = 0.26, p = 0.16), reflecting inputs of anthropogenic Hg sources with varying delta Hg-202. The estuarine organisms all display positive Delta Hg-199 values (0.21 to 0.98 parts per thousand) indicating that MMHg is photodegraded to varying degrees (5-12%) prior to entry into the food web. The delta Hg-202 and Delta Hg-199 values of most organisms can be explained by a mixture of MMHg and inorganic Hg from sediments. At one contaminated site mussels have anomalously high delta Hg-202, indicating exposure to a second pool of MMHg, compared to sediment, crabs and fish. Eiders have similar Delta Hg-199 as killifish but much higher delta Hg-202, suggesting that there is an internal fractionation of delta Hg-202 in birds. Our study shows that Hg isotopes can be used to identify multiple anthropogenic inorganic Hg and MMHg sources and determine the degree of photodegradation of MMHg in estuarine food webs. 1 1 34 scie scopus Article in Journal/Newspaper Somateria mollissima Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) Environmental Science & Technology 48 17 10089 10097 |
institution |
Open Polar |
collection |
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
op_collection_id |
ftponangunivst |
language |
English |
topic |
EIDERS SOMATERIA-MOLLISSIMA TROPHIC TRANSFER STABLE-ISOTOPES MARINE FISH FRACTIONATION HG BIOAVAILABILITY SPECIATION GULF CONTAMINATION |
spellingShingle |
EIDERS SOMATERIA-MOLLISSIMA TROPHIC TRANSFER STABLE-ISOTOPES MARINE FISH FRACTIONATION HG BIOAVAILABILITY SPECIATION GULF CONTAMINATION KWON, SAE YUN BLUM, JOEL D. CHEN, CELIA Y. MEATTEY, DUSTIN E. MASON, ROBERT P. Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US |
topic_facet |
EIDERS SOMATERIA-MOLLISSIMA TROPHIC TRANSFER STABLE-ISOTOPES MARINE FISH FRACTIONATION HG BIOAVAILABILITY SPECIATION GULF CONTAMINATION |
description |
We measured mercury (Hg) isotope ratios in sediments and various estuarine organisms (green crab, blue mussel, killifish, eider) to investigate methylmercury (MMHg) sources and exposure pathways in five Northeast coast (U.S.) estuaries. The mass independent Hg isotopic compositions (MIF; Delta Hg-199) of the sediments were linearly correlated with the sediment 1/Hg concentrations (Delta Hg-199: r(2) = 0.77, p < 0.05), but the mass dependent isotope compositions (MDF; delta Hg-202) were not (r(2) = 0.26, p = 0.16), reflecting inputs of anthropogenic Hg sources with varying delta Hg-202. The estuarine organisms all display positive Delta Hg-199 values (0.21 to 0.98 parts per thousand) indicating that MMHg is photodegraded to varying degrees (5-12%) prior to entry into the food web. The delta Hg-202 and Delta Hg-199 values of most organisms can be explained by a mixture of MMHg and inorganic Hg from sediments. At one contaminated site mussels have anomalously high delta Hg-202, indicating exposure to a second pool of MMHg, compared to sediment, crabs and fish. Eiders have similar Delta Hg-199 as killifish but much higher delta Hg-202, suggesting that there is an internal fractionation of delta Hg-202 in birds. Our study shows that Hg isotopes can be used to identify multiple anthropogenic inorganic Hg and MMHg sources and determine the degree of photodegradation of MMHg in estuarine food webs. 1 1 34 scie scopus |
author2 |
KWON, SAE YUN |
format |
Article in Journal/Newspaper |
author |
KWON, SAE YUN BLUM, JOEL D. CHEN, CELIA Y. MEATTEY, DUSTIN E. MASON, ROBERT P. |
author_facet |
KWON, SAE YUN BLUM, JOEL D. CHEN, CELIA Y. MEATTEY, DUSTIN E. MASON, ROBERT P. |
author_sort |
KWON, SAE YUN |
title |
Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US |
title_short |
Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US |
title_full |
Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US |
title_fullStr |
Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US |
title_full_unstemmed |
Mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the Northeastern US |
title_sort |
mercury isotope study of sources and exposure pathways of methylmercury in estuarine food webs in the northeastern us |
publisher |
American Chemistry Society Publication |
publishDate |
2014 |
url |
https://oasis.postech.ac.kr/handle/2014.oak/41325 https://doi.org/10.1021/es5020554 |
genre |
Somateria mollissima |
genre_facet |
Somateria mollissima |
op_relation |
Environmental Science and Technology Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology 0013-936X https://oasis.postech.ac.kr/handle/2014.oak/41325 doi:10.1021/es5020554 30591 Environmental Science and Technology, v.48, no.17, pp.10089 - 10097 000341229300020 2-s2.0-84906879079 |
op_doi |
https://doi.org/10.1021/es5020554 |
container_title |
Environmental Science & Technology |
container_volume |
48 |
container_issue |
17 |
container_start_page |
10089 |
op_container_end_page |
10097 |
_version_ |
1766197974864494592 |