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Homepage>BS Standards>13 ENVIRONMENT. HEALTH PROTECTION. SAFETY>13.060 Water quality>13.060.50 Examination of water for chemical substances>BS 6068-2.36:1989 Water quality. Physical, chemical and biochemical methods Spectrometric method for the determination of nitrate using sulphosalicylic acid
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immediate downloadReleased: 1989-09-29
BS 6068-2.36:1989 Water quality. Physical, chemical and biochemical methods Spectrometric method for the determination of nitrate using sulphosalicylic acid

BS 6068-2.36:1989

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

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Standard number:BS 6068-2.36:1989
Pages:10
Released:1989-09-29
ISBN:0 580 17681 9
Status:Standard
DESCRIPTION

BS 6068-2.36:1989


This standard BS 6068-2.36:1989 Water quality. Physical, chemical and biochemical methods is classified in these ICS categories:
  • 13.060.50 Examination of water for chemical substances

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.