Water quality. Physical, chemical and biochemical methods Spectrometric method for the determination of nitrate using sulphosalicylic acid

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

29-09-1989

Publisher

British Standards Institution

National foreword
Method
1 Scope
2 Principle
3 Reagents
4 Apparatus
5 Sampling and samples
6 Procedure
7 Expression of results
8 Test report
Annex
A The effect of other substances on this method
Tables
1 Conversion table
2 Standard deviation of repeatability and
reproducibility

Applicable to raw and potable water samples containing nitrate nitrogen from about 0.01 mg/l to 0.2 mg/l using a test portion of 25 ml.

1.1 Substance determined This part of ISO 7890 specifies a method for the determination of nitrate ion in water. 1.2 Type of sample The method is suitable for application to raw and potable water samples. 1.3 Range Up to a nitrate nitrogen concentration, of 0,2 mg/l using the maximum test portion volume of 25 ml. The range can be extended upwards by taking smaller test portions. 1.4 Limit of detection1) Using cells of optical path length 40 mm and a 25 ml test portion volume the limit of detection lies within the range = 0,003 to 0,013 mg/l. 1.5 Sensitivity1) A nitrate nitrogen concentration of = 0,2 mg/l gives an absorbance of about 0,68 unit, using a 25 ml test portion and cells of optical path length 40 mm. 1.6 Interferences A range of substances often encountered in water samples has been tested for possible interference with this method. Full details are given in Annex A. The main potential interferents are chloride, orthophosphate, magnesium and manganese(II), as shown in Annex A. Other tests have shown that this method will tolerate a sample colour of up to 150 mg/l Pt providing the test portion absorption correction procedure is followed. (See 6.5.)

Committee	EH/3
DevelopmentNote	Supersedes 87/51929 DC Also numbered as ISO 7890-3. (11/2003) Reviewed and Confirmed by BSI, October 2006. (09/2006)
DocumentType	Standard
Pages	10
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 2690-7:1968

03/110850 DC : DRAFT JULY 2003	BS 8427 - JUG WATER FILTER SYSTEMS - SPECIFICATION
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BS 6068-2.36:1989

Water quality. Physical, chemical and biochemical methods Spectrometric method for the determination of nitrate using sulphosalicylic acid

Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

Category

Subcategory