FIELD: chemistry.
SUBSTANCE: method according to the present invention includes the pretreatment of a sample via alkaline hydrolysis, followed by colorimetric determination based on the metal complex, which is determined during substance analysis with a thiocyanate agent, wherein the said complex is extracted by a water-immiscible organic solvent.
EFFECT: alkaline hydrolysis leads to the removal of interfering proteins and increases selectivity with respect to the surfactants which are similar to the substance being determined during analysis, for example Tween 80 selectivity relative to Triton X-100.
15 cl, 6 dwg, 3 tbl, 8 ex
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