BS EN ISO 10695:2000

This standard BS EN ISO 10695:2000 Water quality. Determination of selected organic nitrogen and phosphorus compounds. Gas chromatographic methods is classified in these ICS categories:

• 13.060.50 Examination of water for chemical substances

This International Standard specifies two methods for the determination of certain organic nitrogen and phosphorus compounds in waters by gas chromatography (see Table 1).

The methods may be extended to include additional substances, provided the methods are validated for each individual case.

Clause 3 describes the liquid/liquid extraction method, which is applicable to samples of drinking waters, ground waters, surface waters and waste waters containing up to 0,05 g/l of suspended solids. In the presence of organic matter, suspended matter and colloids, interferences are more numerous and consequently the detection limits of this method can be higher.

NOTE Because of the very low concentrations normally present in the waters, the problem of contamination is extremely important. The lower the level measured, the more precautions have to be observed.

Clause 4 describes the liquid/solid extraction method which is applicable to samples of ground water, surface water and drinking water containing mass concentrations of about ≥ 0,05 μg/l. Interferences occurring with the examination of some types of surface water can prevent the application of this method.

Detection limits are given for information in annex A.

NOTE When applying this International Standard, the guide on analytical quality control for water analysis (see ISO/TR 13530) should be followed.

Table 1

Organic nitrogen and phosphorus compounds analysed by these methods

Name	Molecular formula	Molar mass	CAS No.a
Atrazine	C8H14ClN5	215,7	001912-24-9
Cyanazine	C9H13ClN6	240,7	021725-46-2
Metazachlor	C14H16ClN3O	277,8	067129-08-2
Parathion (ethyl)	C10H14NO5PS	291,3	00056-38-2
Parathion (methyl)	C8H10NO5PS	263,2	298-00-0
Pendimethalin	C13H19N3O4	281,3	040487-42-1
Propazine	C9H16ClN5	229,7	000139-40-2
Sebuthylazine	C9H16ClN5	229,7	007286-69-3
Simazine	C7H12ClN5	201,7	000122-34-9
Terbuthylazine	C9H16ClN5	229,7	005915-41-3
Trifluralin	C13H16F3N3O4	335,3	001582-09-8
Vinclozolin	C12H9Cl2NO3	286,1	050471-44-8

^a Chemical Abstracts Registry Number. 2