FIELD: chemistry.
SUBSTANCE: method involves using sulphonazo as a colour reagent and photometering, wherein a sulphonazo ion-associate with an azo dye is formed in the solution, which is then concentrated on a foamed polyurethane sorbent, followed by photometering of the ion-associate directly on the solid phase at pH=8 and wavelength 538 nm.
EFFECT: high sensitivity and selectivity of analysis.
1 ex, 2 tbl, 3 dwg
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