Cyanides & Thiocyanate in Waters

SOP: 1300

UKAS accredited

Free [or easy liberatable] cyanide, total cyanide, complex cyanide, thiocyanate.

Free cyanide: Automated acid distillation followed by colorimetric development with chloramine-T and pyridine/barbituric acid. Intensity of colour at 610nm is measured.

Total cyanide by UV decomposition of complex bound cyanides with measurement of resulting free cyanide as above.

Complex cyanide determined by difference.

Thiocyanate is converted to cyanogen chloride which reacts with chloramine-T and 1.3-dimethylbarbituric acid/isonicotinic acid.  Intensity of colour measured at 600nm.

 

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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 BR279 (1995) has largely been superseded by analytical procedures as detailed in TRL 447 and BRE Special Digest:1 2005 3rd Edition.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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