The mean and standard
COPPER 158
6. POTENTIAL FOR HUMAN EXPOSURE
deviation percentages of copper in the various fractions were: exchangeable, 0 (0); carbonate, 0.1 (0.3);
iron or manganese oxide-bound, 0.2 (0.3); organic-bound, 40 (11); and residual, 60 (8). Another study
found that 10–20% of the copper in Lake Ontario sediment samples was bound to humic acids, with
virtually all of the copper bound to organic matter (Nriagu and Coker 1980). The concentration of copper
associated with humic acids was 21–40 times greater than in the sediment as a whole
The mean and standard
COPPER 158
6. POTENTIAL FOR HUMAN EXPOSURE
deviation percentages of copper in the various fractions were: exchangeable, 0 (0); carbonate, 0.1 (0.3);
iron or manganese oxide-bound, 0.2 (0.3); organic-bound, 40 (11); and residual, 60 (8). Another study
found that 10–20% of the copper in Lake Ontario sediment samples was bound to humic acids, with
virtually all of the copper bound to organic matter (Nriagu and Coker 1980). The concentration of copper
associated with humic acids was 21–40 times greater than in the sediment as a whole
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