The indirect colorimetric determination of sulphate with 2-aminoperimidine
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 100 (1195) , 755-757
- https://doi.org/10.1039/an9750000755
Abstract
An indirect colorimetric procedure is described for the determination of sulphate. After precipitating the sulphate as 2-aminoperimidinium sulphate, the remaining 2-aminoperimidine reagent is determined colorimetrically following treatment with nitrous acid and alkali in order to give a red colour with maximum absorbance at 525 nm and a molar absorptivity of 13 600 l mol–1 cm–1. The mean absorbance difference for a sulphate-ion concentration of 10 mg l–1 is 0·283 with a relative standard deviation of 4 per cent.Keywords
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