IMPACT OF ABANDONED MINE TAILINGS ON THE ARSENIC CONCENTRATIONS IN MOIRA LAKE, ONTARIO

被引:81
作者
AZCUE, JM [1 ]
NRIAGU, JO [1 ]
机构
[1] UNIV MICHIGAN,DEPT ENVIRONM & IND HLTH,ANN ARBOR,MI 48109
关键词
D O I
10.1016/0375-6742(94)00032-7
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Arsenic has accumulated in the different compartments of Moira Lake for the last 160 years, since mining and mineral processing began in the area. The annual total fluvial input of arsenic (As) to the lake is approximately 3.5 tonnes. The dissolved As concentrations in the water show seasonal differences, with an average concentration of 62 mug/L during the summer, and 22 mug/L in winter. The As bound to particles represent approximately 8% of the total As burden in the water column. Arsenic bound to the organic humic, fulvic and lipid fractions represents approximately 1% of the total As in Moira Lake waters. The dissolved As profile of interstitial waters are characterized by subsurface maxima with concentrations four to six times greater than the lake waters. Inorganic As makes up the majority of the As in all the porewater profiles examined. The upward diffusion of As-enriched interstitial waters can explain the distribution of As(III) and As(V) in the overlying lake water. The diffusion upward through the hypolimnion of the arsenite originated in the interstitial water explain the thermodynamic disequilibrium in the distribution of As species in the surface waters of Moira Lake.
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页码:81 / 89
页数:9
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