A method is described which eliminates the necessity for ashing in the determination of strontium ~ 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 Na~CO~. The alkaline earth precipitates are separated and analyzed as described previously for milk ash (8). The results of strontium ~ analysis on alkaline earth precipitates are not significantly different from the results obtained by analysis of milk ash.
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Murthy et al. (1960) studied this question.
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