| Abstract: | A battery-powdered in situ pump sampler, capable of operation at full oceanic depths, has been designed, built and tested. The pump motor, sealed in a pressure-proof housing, is coupled magnetically to the pump head. Water is drawn through a filter then passed successively through an adsorption column and the pumphead and finally through a flowmeter. The unit as a whole is pivoted and vaned so that the intake is always pointed into the current. The selectivity of the sampler depends upon the choice of packing material used in the adsorption column or columns. Column materials specific for different classes of compounds have been tested in the laboratory and at sea. Preliminary results in the collection and measurement of Cu and Cd suggest that the pumping system is free from shipboard contamination. |
