SN EN ISO 11905-1 : 1999

1 Scope
2 Normative references
3 Range of detection
4 Sensitivity
5 Principle
6 Reagents
7 Apparatus
8 Sampling and samples
9 Procedure
    9.1 Test portion
    9.2 Blank test
    9.3 Cleaning digestion vessels
    9.4 Digestion
    9.5 Verification of recovery of organic nitrogen
    9.6 Starting operation
    9.7 Initial sensitivity setting
    9.8 Calibration
    9.9 Determination
10 Expression of results
    10.1 Method of calculation
    10.2 Precision data
11 Test report

Defines a procedure for determining the nitrogen content in water, in the form of free ammonia, nitrite, nitrate and organic nitrogen compounds capable of converting to nitrate under the oxidative conditions described. Does not determine dissolved nitrogen. Applies to the analysing of natural fresh water, sea water, drinking, surface water and treated sewage effluent. ALSO KNOWN AS BS 6068-2.62(1998)