VDI 2456 Blatt 8:1986-01

Gaseous emission measurement; analytical determination of the sum of nitrogen monoxide and nitrogen dioxide; sodium salicylate method

German title: Messen gasförmiger Emissionen; Analytische Bestimmung der Summe von Stickstoffmonoxid und Stickstoffdioxid; Natriumsalicylatverfahren
Publication date: 1986-01
Original language: German, English
Pages: 12

Publication date: 1986-01
Original language: German, English
Pages: 12

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Short description

The nitrogen monoxide and nitrogen dioxide present in a defined sample volume of the gas to be investigated are quantitatively oxidized to nitric acid by a hydrogen peroxide solution acidified with sulphuric acid. The method described covers all nitrogen oxides with the exception of nitrous oxide.*Subsequent conversion with sodium salicylate in a concentrated sulphuric acid medium produces nitrosalicylic acid. The addition of Rochelle salt in a solution of caustic soda produces a yellow anion of nitrosalicylic acid whose concentration is determined photometrically. The total concentration of the nitrogen oxides in the sample of gas is stated in terms of nitrogen dioxide.

Content

ICS

13.040.20

Replacement amendments

This document has been replaced by: VDI 2456:2004-11 .

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