The preparation of permanent turbidimetric standards for use in the determination of small amounts of chloride

Abstract
The preparation of turbidimetric standards, made of Perspex, (polymethyl methacrylate-polystyrene interpolymer) is described. The turbidities of these standards are permanent, and form a useful basis of comparison for AgCl, protein and other analytical procedures which depend on the production of finely dispersed precipitates.
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