Abstract
A new method is described, employing acetone and a sonicator, for the procurement of a homogeneous mixture of lake mud and graphite suitable for optical emission analysis. The effects of variable matrices are masked by use of a mixture of 2 parts graphite to 1 part CaF<sub>2</sub>. The elements studied in these variable matrices were Be, Hg, Bi, Sn, Co, B, Na, Mo, V, Ag, Li, and Cd. The percent standard deviations obtained on replicate analyses are extremely small.
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