Coal, fly ash, slag, and combustion gases from a large cyclone-fed power plant 870 MW(e) were analyzed for a suite of elements. Mass balance calculations show that the sampling and analyses were generally adequate to describe the flows of these elements through the plant. Most Hg, some Se, and probably most Cl and Br were discharged to the atmosphere as gases.

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Traces of cesium can b e concentrated from large volumes of water by batch adsorption on ammonium 12-molybdophosphate (AMP). is used as a floccdant to facilitate collection of the P A P .The solids are dissolved in NaOH, the Cs is extracted with a hrxone-cyclohexane solution of sodium tetraphenyl boron, and the extract is tiurned in a flame photometer. The limit of detection is 0.005 i g. Cs per inl. of the solution burned. If the collection procedure is applied to an 8-liter water sample, this corresponds to a detection limit of 6 X 1 0-6 p g . per ml. of the water.With minor modifications the procedure can also be: applied to sea water, tissue ash, and minerals.

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