Watershed influences on mercury in tributaries to Lake Ontario

Joseph S. Denkenberger, Habibollah Fakhraei, Brian Branfireun, Mario Montesdeoca, Charles T. Driscoll

Research output: Contribution to journalArticle

Abstract

Mercury (Hg) concentrations and speciation were measured in nine tributaries to Lake Ontario as part of two independent field-sampling programs. Among the study tributaries, mean total Hg (THg) concentrations ranged from 0.9 to 2.6 ng/L; mean dissolved Hg (THgD) ranged from 0.5 to 1.5 ng/L; mean particulate Hg (THgP) ranged from 0.3 to 2.0 ng/L; and mean methylmercury (MeHg) ranged from 0.06 to 0.14 ng/L. Watershed land cover, total suspended solids (TSS), and dissolved organic carbon (DOC) were evaluated as potential controls of tributary Hg. Significant relationships between THgD and DOC were limited, whereas significant relationships between THgP and TSS were common across watersheds. Total suspended solids was strongly correlated with the percentage of agricultural land in watersheds. Particle enrichment of Hg (mass Hg/mass TSS) was highly variable, but distinctly higher in US tributaries likely due to higher TSS in Canadian tributaries associated with higher urban and agricultural land cover. MeHg was largely associated with the aqueous phase, and MeHg as a fraction of THg was positively correlated to percent open water coverage in the watershed. Wetland cover was positively correlated to THg and MeHg concentrations, while urban land cover was only related to higher THgP.

Original languageEnglish (US)
JournalEcotoxicology
DOIs
StateAccepted/In press - Jan 1 2020

Fingerprint

Ontario
Lakes
Watersheds
Mercury
tributary
Carbon
watershed
Wetlands
lake
land cover
Organic carbon
dissolved organic carbon
agricultural land
Water
methylmercury
open water
wetland
mercury
Sampling
sampling

Keywords

  • Lake Ontario
  • Land cover
  • Mercury
  • Watershed

ASJC Scopus subject areas

  • Toxicology
  • Management, Monitoring, Policy and Law
  • Health, Toxicology and Mutagenesis

Cite this

Denkenberger, J. S., Fakhraei, H., Branfireun, B., Montesdeoca, M., & Driscoll, C. T. (Accepted/In press). Watershed influences on mercury in tributaries to Lake Ontario. Ecotoxicology. https://doi.org/10.1007/s10646-019-02157-4

Watershed influences on mercury in tributaries to Lake Ontario. / Denkenberger, Joseph S.; Fakhraei, Habibollah; Branfireun, Brian; Montesdeoca, Mario; Driscoll, Charles T.

In: Ecotoxicology, 01.01.2020.

Research output: Contribution to journalArticle

Denkenberger, Joseph S. ; Fakhraei, Habibollah ; Branfireun, Brian ; Montesdeoca, Mario ; Driscoll, Charles T. / Watershed influences on mercury in tributaries to Lake Ontario. In: Ecotoxicology. 2020.
@article{f7054c3140574768b5c69a9b4d299ce4,
title = "Watershed influences on mercury in tributaries to Lake Ontario",
abstract = "Mercury (Hg) concentrations and speciation were measured in nine tributaries to Lake Ontario as part of two independent field-sampling programs. Among the study tributaries, mean total Hg (THg) concentrations ranged from 0.9 to 2.6 ng/L; mean dissolved Hg (THgD) ranged from 0.5 to 1.5 ng/L; mean particulate Hg (THgP) ranged from 0.3 to 2.0 ng/L; and mean methylmercury (MeHg) ranged from 0.06 to 0.14 ng/L. Watershed land cover, total suspended solids (TSS), and dissolved organic carbon (DOC) were evaluated as potential controls of tributary Hg. Significant relationships between THgD and DOC were limited, whereas significant relationships between THgP and TSS were common across watersheds. Total suspended solids was strongly correlated with the percentage of agricultural land in watersheds. Particle enrichment of Hg (mass Hg/mass TSS) was highly variable, but distinctly higher in US tributaries likely due to higher TSS in Canadian tributaries associated with higher urban and agricultural land cover. MeHg was largely associated with the aqueous phase, and MeHg as a fraction of THg was positively correlated to percent open water coverage in the watershed. Wetland cover was positively correlated to THg and MeHg concentrations, while urban land cover was only related to higher THgP.",
keywords = "Lake Ontario, Land cover, Mercury, Watershed",
author = "Denkenberger, {Joseph S.} and Habibollah Fakhraei and Brian Branfireun and Mario Montesdeoca and Driscoll, {Charles T.}",
year = "2020",
month = "1",
day = "1",
doi = "10.1007/s10646-019-02157-4",
language = "English (US)",
journal = "Ecotoxicology",
issn = "0963-9292",
publisher = "Springer Netherlands",

}

TY - JOUR

T1 - Watershed influences on mercury in tributaries to Lake Ontario

AU - Denkenberger, Joseph S.

AU - Fakhraei, Habibollah

AU - Branfireun, Brian

AU - Montesdeoca, Mario

AU - Driscoll, Charles T.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Mercury (Hg) concentrations and speciation were measured in nine tributaries to Lake Ontario as part of two independent field-sampling programs. Among the study tributaries, mean total Hg (THg) concentrations ranged from 0.9 to 2.6 ng/L; mean dissolved Hg (THgD) ranged from 0.5 to 1.5 ng/L; mean particulate Hg (THgP) ranged from 0.3 to 2.0 ng/L; and mean methylmercury (MeHg) ranged from 0.06 to 0.14 ng/L. Watershed land cover, total suspended solids (TSS), and dissolved organic carbon (DOC) were evaluated as potential controls of tributary Hg. Significant relationships between THgD and DOC were limited, whereas significant relationships between THgP and TSS were common across watersheds. Total suspended solids was strongly correlated with the percentage of agricultural land in watersheds. Particle enrichment of Hg (mass Hg/mass TSS) was highly variable, but distinctly higher in US tributaries likely due to higher TSS in Canadian tributaries associated with higher urban and agricultural land cover. MeHg was largely associated with the aqueous phase, and MeHg as a fraction of THg was positively correlated to percent open water coverage in the watershed. Wetland cover was positively correlated to THg and MeHg concentrations, while urban land cover was only related to higher THgP.

AB - Mercury (Hg) concentrations and speciation were measured in nine tributaries to Lake Ontario as part of two independent field-sampling programs. Among the study tributaries, mean total Hg (THg) concentrations ranged from 0.9 to 2.6 ng/L; mean dissolved Hg (THgD) ranged from 0.5 to 1.5 ng/L; mean particulate Hg (THgP) ranged from 0.3 to 2.0 ng/L; and mean methylmercury (MeHg) ranged from 0.06 to 0.14 ng/L. Watershed land cover, total suspended solids (TSS), and dissolved organic carbon (DOC) were evaluated as potential controls of tributary Hg. Significant relationships between THgD and DOC were limited, whereas significant relationships between THgP and TSS were common across watersheds. Total suspended solids was strongly correlated with the percentage of agricultural land in watersheds. Particle enrichment of Hg (mass Hg/mass TSS) was highly variable, but distinctly higher in US tributaries likely due to higher TSS in Canadian tributaries associated with higher urban and agricultural land cover. MeHg was largely associated with the aqueous phase, and MeHg as a fraction of THg was positively correlated to percent open water coverage in the watershed. Wetland cover was positively correlated to THg and MeHg concentrations, while urban land cover was only related to higher THgP.

KW - Lake Ontario

KW - Land cover

KW - Mercury

KW - Watershed

UR - http://www.scopus.com/inward/record.url?scp=85077681757&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85077681757&partnerID=8YFLogxK

U2 - 10.1007/s10646-019-02157-4

DO - 10.1007/s10646-019-02157-4

M3 - Article

AN - SCOPUS:85077681757

JO - Ecotoxicology

JF - Ecotoxicology

SN - 0963-9292

ER -