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A Method for the Elimination of Ashing in Strontium⁹⁰ Determination of Milk

Milk and Food Research and Radiological Health Activities, Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio

ABSTRACT

A method is described which eliminates the necessity for ashing in the determination of strontium⁹⁰ in milk. After the addition of a known amount of strontium carrier, the milk is treated with an equal volume of 24% trichloroacetic acid. The solution is filtered and the alkaline earths precipitated from the filtrate by adjusting the pH to 8.5–9.0 with NaOH in the presence of Na₂CO₃. The alkaline earth precipitates are separated and analyzed as described previously for milk ash (8). The results of strontium⁹⁰ analysis on alkaline earth precipitates are not significantly different from the results obtained by analysis of milk ash.