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  • BSI
    BS 6068-2.36:1989, ISO 7890-3:1988 Water quality. Physical, chemical and biochemical methods - Spectrometric method for the determination of nitrate using sulphosalicylic acid
    Edition: 1989
    $281.30
    / user per year

Description of BS 6068-2.36:1989 1989

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, 00200903_img1 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 00200903_img1 = 0,003 to 0,013 mg/l.

1.5 Sensitivity1)

A nitrate nitrogen concentration of 00200903_img1 = 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.)



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.

Standard NumberBS 6068-2.36:1989, ISO 7890-3:1988
TitleWater quality. Physical, chemical and biochemical methods - Spectrometric method for the determination of nitrate using sulphosalicylic acid
StatusUnder Review
Publication Date1989-09-29
ReplacesBS 2690-7:1968
DescriptorsQuality, Chemical analysis and testing, Concentration (chemical), Nitrates, Determination of content, Water, Calibration, Sensitivity, Potable water, Spectrophotometry, Reproducibility, Water testing, Water resources, Interferences (chemical), Testing conditions
ICS13.060.50 Examination of water for chemical substances
CommitteeEH/3
ISBN0 580 17681 9
PublisherBSI
Pages10

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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