An investigation carried out by Hunter and others (1945) on the health of workers at the refinery of the Mond Nickel Co., Ltd., Bashley Road, London, N.W.10, made it necessary to estimate the atmospheric content of platinum and palladium in the neighbourhood of various unit processes. The method of sampling the atmosphere and the collection of the precious metals on a particulate filter is described by Hunter and his col leagues. But we were more particularly concerned with the estimation of the traces of platinum and palladium collected on the particulate filter pads. The principle of the method we used was to collect the precious metals in a silver bead by standard smelting methods followed by cupellation and then to estimate the platinum and palladium in the silver bead spectrographically.
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Fothergill et al. (1945) studied this question.