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.
BS 4427-6-1974由英国标准学会 GB-BSI 发布于 1974-06-07,并于 1974-06-07 实施。
BS 4427-6-1974 在中国标准分类中归属于: G12 无机盐,在国际标准分类中归属于: 71.060.50 盐。
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