METHOD FOR DETERMINING QUANTITY OF α-HYDROXYNAPHTHOIC ACID IN EXPANDERS, PASTES, AND ACTIVE MATERIAL OF LEAD-ACID CELLS Russian patent published in 1996 - IPC

Abstract SU 1342350 A1

FIELD: electrical engineering. SUBSTANCE: analyzed material sample is treated by thinned nitrogen acid while heating till aciform of a-hydroxynaphthoic acid is obtained by disintegrating samples. Then sample is treated by ammonium acetone doped with light-base ammonium hydroxide. This eliminates influence of various factors on accuracy of determination of lead, lead oxide and sulfate, and provides for producing colored compound which is photometrically evaluated. a-hyroxynaphthoic acid content is calculated by means of calibration chart. EFFECT: improved accuracy and speed of process. 3 tbl

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SU 1 342 350 A1

Authors

Seljanina V.G.

Zabolotskaja A.I.

Zakharov M.S.

Mal'Chevskaja T.N.

Dates

1996-01-10—Published

1985-05-30—Filed