Particulate and Dissolved Trace Element Concentrations in Three Southern Ecuador Rivers Impacted by Artisanal Gold Mining

被引：49

作者：

Carling, Gregory T. ^{[1
]}

Diaz, Ximena ^{[2
]}

Ponce, Marlon ^{[3
]}

Perez, Lester ^{[4
]}

Nasimba, Luis ^{[3
]}

Pazmino, Eddy ^{[1
]}

Rudd, Abigail ^{[1
]}

Merugu, Srinivas ^{[1
]}

Fernandez, Diego P. ^{[1
]}

Gale, Bruce K. ^{[5
]}

Johnson, William P. ^{[1
]}

机构：

[1] Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA

[2] Escuela Politec Nacl, Dept Extract Met, Quito, Ecuador

[3] INIGEMM, Inst Nacl Invest Geol Minero Met, Quito, Ecuador

[4] INAMHI, Inst Nacl Meteorol & Hidrol, Quito, Ecuador

[5] Univ Utah, Dept Mech Engn, Salt Lake City, UT 84112 USA

来源：

WATER AIR AND SOIL POLLUTION | 2013年 / 224卷 / 02期

基金：

美国国家科学基金会;

关键词：

Cyanidation; Methyl mercury; Trace metals; Particulate loads; Dissolved loads; Ecuador; MERCURY METHYLATION; SMALL-SCALE; METHYLMERCURY PRODUCTION; PORTOVELO-ZARUMA; CONTAMINATION; MANAGEMENT; SORPTION; SOILS; BASIN; AREA;

D O I：

10.1007/s11270-012-1415-y

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Water and sediment samples were collected along river transects at three artisanal gold mining areas in southern Ecuador: Nambija, Portovelo-Zaruma, and Ponce Enriquez. Samples were analyzed for a suite of major and trace elements, including filtered/unfiltered water samples and stream flow measurements to determine dissolved/particulate loads. Results show that the Q. Calixto, Calera, and Siete rivers (corresponding to Nambija, Portovelo-Zaruma, and Ponce Enriquez mining areas, respectively) have substantial trace element contamination due to mining inputs. Dissolved concentrations were elevated at Calera and Siete relative to Q. Calixto, possibly reflecting the input of soluble cyano-metal complexes in mining zones where cyanidation is used in ore processing. A negative correlation was found between MeHg: THg ratios and pH, indicating an inverse relationship of mercury methylation with cyanidation (since cyanidation increases water pH). This was the first comprehensive study to examine an extensive suite of trace elements in both water and sediment at the three main gold mining areas of southern Ecuador, including dissolved and particulate loads, and the first study to report MeHg concentrations in the mercury-contaminated rivers.

引用

页数：16

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