Open AccessIndirect Determination of Phosphate-ions in Waters with the Reagent Sulfonitrazo DAF
Author(s) -
S. Yu. Kel’ina,
O. G. Nevinsky
Publication year - 2021
Publication title -
metody i obʺekty himičeskogo analiza
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.138
H-Index - 3
eISSN - 2413-6166
pISSN - 1991-0290
DOI - 10.17721/moca.2021.147-152
Subject(s) - molybdate , reagent , phosphate , chemistry , extraction (chemistry) , molybdenum blue , ion , isoamyl alcohol , aqueous solution , isoamyl acetate , chromatography , phosphorus , inorganic chemistry , biochemistry , organic chemistry , ethyl acetate , alcohol
An indirect method for the determination of phosphate ions in natural and treated wastewater is proposed, which is based on the formation of molybdophosphate complex (MFC), separating it from excess unbound molybdate by isoamyl acetate extraction, extraction of MFC into weakly alkaline aqueous phase, destruction of MFC and photometric determination of the equivalent amount of molybdate ions with the sulfonitrazo DAF reagent. The technique allows to determine from 0.02 to 0.43 mg dm-3 of phosphate ion (in terms of phosphorus).