Total Nitrogen in Waters

SOP: 1340

Total nitrogen, organic nitrogen and Kjeldahl nitrogen.

An alkaline persulphate digestion converts all forms of nitrogen to nitrate.  The nitrate then reacts with chromotropic acid under strongly acidic conditions to form a yellow complex.  Its absorbance is measured at 420nm.

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    A number of different publications and standards cite sulphate methods. BR279 (1995) has largely been superseded by analytical procedures as detailed in TRL 447 and BRE Special Digest:1 2005 3rd Edition. In addition further reference may be made to BS EN 144-1:2009 + A1:2012 for the testing of aggregates and BS 1377:2018 for soils for civil engineering purposes.

    Testing to meet the requirements of UKWIR Report Ref. No. 10/WM/03/21 Guidance for the selection of water supply pipes to be used in brownfield sites.

    Testing & reporting is undertaken in accordance with BS 3882:2015 Specification for topsoil and BS 8601:2013 Specification for subsoil and requirements for use

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