Abstract
During the Swedish Arctic expedition “Ymer 80” into the area from North Greenland to Franz-Josef-Land in late sumnier 1980, freshly fallen snow, and snow from the previous fall/winter season were collected from ice floes. Lead. cadmium and copper analysis was performed on board ship, using I he advanced voltammetric determination method of differential pulse anodic stripping voltammeuy at rotating glassy carbon electrodes. The analytic operations were performed under a clean bench in a clean room container. Nickel. and tentatively. cobalt levels were analyzed in our home laboratory by differential pulse voltammetry after preconcentration by chelate adsorption at a hanging mercury drop electrode. Results from freshly fallen snow compared to snow from the previous season show that there exists a strong seasonal variation in trace metal deposition, indicating that pollution of the Arctic atmosphere is clearly limited to winter time, when atmospheric conditions favour long-distance transport of polluted air masses from Europe to the Arctic. Unexpectedly low mean levels of 0.4 ng kg-1 Cd. 13 ng kg-1 Pb, 20 ng kg-1 Cu and 22 ng kg-1 Ni were found in freshly fallen snow. levels that represent about 1/10 to 1/20 ofthose in annual condensed layers.