METHOD OF DETERMINING MICROCONCENTRATIONS OF ANTIMONY IN NATURAL WATERS FOR ENVIRONMENTAL MONITORING Russian patent published in 2005 - IPC

FIELD: analytical methods in environmental monitoring.

SUBSTANCE: method comprises: sampling, acidifying samples with HCl/H₂SO₄ mixture, adding Ce(SO₄)₂ as oxidant and removing its excess with reducing agent NH₂OH·HCl, adding rhodamine C as organic reagent, extracting resulting complex, separating organic phase from aqueous phase, and measuring optical density. Extraction is performed with carbon tetrachloride/methyl isobutyl ketone mixture at 5:1 volume ratio and extractant-to-sample volume ratio 1:1 under dynamic conditions by way of washing away complex with extractant. Content of antimony is judged of from difference of optical densities of extractant and mixture.

EFFECT: lowered measurement threshold to values comparable with allowable limits, increased reliability, reduced analysis time, and automated analytical procedure.

3 cl, 1 dwg, 3 tbl, 3 ex