Titrimetric estimation of phosphate, molybdate and sulphate with lead nitrate solution, using 2-(2'-lepidyl azo)-l-naphthol-4-ammonium sulphonate (Lanas) as visual indicator

R C CHADHA, B S GARG, SWARAN LATA, R P SINGH

Abstract


2-(2'┬ĚLepidylazo)-1-naphthol-4-ammonium sulphonate (LANAS) forms a blue coloured Complex with Pb(II) which is readily destroyed on addition of sulphate, phosphate and molybdate. Titrimetric procedures for the estimations of these ions have been developed. Large number of completing anions do not interfere.

Keywords


Titrimetric estimations; sulphate; phosphate and molybdate; LANAS as metallochromic indicator.

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