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2 142 620

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IPC

(21) (22)

Application

98109980/28, 1998-05-26

(24)

Start date

1998-05-26

(22)

Actual filing date

1998-05-26

(45)

Published

1999-12-10

(72)

Inventor

Korenman Ja.I.Novikova N.A.

(73)

Holder

Voronezhskaja Gosudarstvennaja Tekhnologicheskaja Akademija

METHOD OF DETERMINING M-NITROBENZOIC ACID IN AQUEOUS SOLUTIONS Russian patent published in 1999 - IPC

Abstract RU 2142620 C1

FIELD: analytical methods. SUBSTANCE: invention is designed for application in controlling unpurified and purified waste waters at varnish- and-paint and textile industry enterprises. Sample is preliminarily concentrated by extraction with tert-butyl acid in presence of 15-20 wt % of lithium sulfate. Further, determination is effected directly in extract solution involving photometric titration technique based on redoxometric mechanism with aqueous iodine solution as titrant. Concentration of m- nitrobenzoic acid in aqueous solutions that can be measured is 2.42 mcg/cu.dm, and analysis time is 30-40 min. EFFECT: lowered determination limit and accelerated analysis. 1 dwg, 2 tbl, 11 ex

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RU 2 142 620 C1

Authors

Korenman Ja.I.

Novikova N.A.

Dates

1999-12-10—Published

1998-05-26—Filed

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