BS 4427-6:1974

This standard BS 4427-6:1974 Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use is classified in these ICS categories:

• 71.060.50 Salts

This Part of BS 4427 specifies a potentiometric method for the estimation of the pyrophosphate content of tetrasodium pyrophosphate for industrial use.

NOTE The titles of the British Standards referred to in this Part are listed on the inside back cover.

Potentiometric method after conversion of the tetrasodium pyrophosphate to disodium dihydrogen pyrophosphate and precipitation of the pyrophosphate with liberation of sulphuric acid. Applicable to products containing at least 90 per cent of tetrasodium pyrophosphate and in the absence of more condensed forms of phosphate.