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  • BSI
    BS 6068-2.18:1986 Water quality. Physical, chemical and biochemical methods - Methods for the determination of easily liberatable cyanide
    Edition: 1986
    $313.97
    / user per year

Description of BS 6068-2.18:1986 1986

This Section of this British Standard specifies three methods for the determination of easily liberatable cyanide (see clause 2) in water.

The methods are applicable to water containing less than 50 mg of easily liberatable cyanide (as cyanide ions) per litre, and less than 100 mg of total cyanide (as cyanide ions) per litre, but higher concentrations may be determined by suitable dilution of the sample.

The methods and corresponding ranges of easily liberatable cyanide contents for which they are suitable are as follows:

  • Photometric method with pyridine/barbituric acid: applicable when the absorption solution contains 0,002 to 0,025 mg of cyanide, corresponding to 0,02 to 0,25 mg/l in a 100 ml aliquot portion of the undiluted sample;
  • Titrimetric method using the Tyndall effect: applicable when the absorption solution contains > 0,005 mg of cyanide, corresponding to > 0,05 mg/l in a 100 ml aliquot portion of the undiluted sample;
  • Titrimetric method using an indicator: applicable when the absorption solution contains > 0,05 mg of cyanide, corresponding to >0,5 mg/l in a 100 ml aliquote portion of the undiluted sample.

A large number of ions and compounds interfere with the determination. These are listed in Table 1, together with the concentrations below which they do not interfere. If present singly or in combination, up to limiting concentrations, they do not interfere with the separation of hydrogen cyanide. The list is not exhaustive.



Three methods for up to 50 mg/l: a photometric method with pyridine/barbituric acid, a titrimetric method using the Tyndall effect and a titrimetric method using an indicator.

Standard NumberBS 6068-2.18:1986
TitleWater quality. Physical, chemical and biochemical methods - Methods for the determination of easily liberatable cyanide
StatusConfirmed
Publication Date1986-02-28
Related National Standard OfISO 6703-2:1984
DescriptorsCalibration, Dimensions, Test equipment, Chemical analysis and testing, Water testing, Determination of content, Chemical hazards, Wastes, Testing conditions, Cyanides (inorganic), Sewage, Interferences (chemical), Water resources, Water, Safety measures, Effluents (sewage), Quality, Specimen preparation, Precision, Volumetric analysis, Spectrophotometry
ICS13.060.50 Examination of water for chemical substances
CommitteeEH/3/2
ISBN0 580 14988 9
PublisherBSI
Pages18

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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