FIELD: chemistry.
SUBSTANCE: method involves applying to the carrier with high capillary properties initially a solution of 4-(2-pyridylazo) resorcinol in a concentration of 0.10-0.30 wt %, and then the solution 1M sodium tartrate in a molar ratio of 7.5:1, respectively. The indicator plate is placed in a sealed package when wet.
EFFECT: improved accuracy of measurements.
3 dwg, 4 tbl, 3 ex
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