METHOD FOR DETERMINING SMALL CONTENTS OF SILVER IN DEVELOPED PHOTOGRAPH

摘要

SUMMARY OF THE INVENTION: In the process of determining small amounts of silver in the photographic image by development, comprising heating the film sample in 3N. nitric acid solution for 15-20 minutes at, cooling the resulting rastpora nitric acid to silver of 18 ± 5 & amp; deg; C. diluting the solution with distilled soda to a concentration of 0.1 N nitric acid., introduction of the surfactant nonilfeno- polyglycidyl ether or the sodium salt la izododetsildo- dekaetilenglikolevogo phosphonyl ester n- tare acid or disodium 2- (N-3-deci- loksipropil- N-diethyl) suktsina- minosulfonata in an amount of 50-450 mg / kg dietilaminobenzilidenrodanida introduction 0.01 dietilaminobenzilidenrodanida% alcoholic solution, maintaining the resulting suspension in the dark for 15-20 min and the optical density measurement sol ra 1-yl, 1 tab. 73 C