Abstract
A vertical distribution profile of dissolved lead (Pb) in Lake Baikal water was measured by an isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS), where the validation of the method was confirmed by the determination of Pb in a river water reference material (JSAC 0302). The concentrations of Pb were generally in a relatively narrow range from 6.39 pg mL−1 to 14.5 pg mL−1, except for that in the surface water sample (194pg mL−1), which might be attributed to the surface input of Pb as airborne suspended particulate, river flow, and other kind of discharge. Furthermore, the concentration of Pb in bottom water sample was also slightly higher than those in the samples collected at other depths, which was attributed to the dissolution of Pb from bottom sediments. On the other hand, the average concentration of Pb in lake water samples collected at various depths was approximately 9.6pg mL−1, which was much lower than those observed by other researchers.
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