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Persulphate Estimation using Sodium Nitroprusside by Photochemical Ligand Exchange Reaction Method

Author(s): Ajay Sharma, Hardik Bhatt, Gayatri Prasad and Vaibhav Bhatt

Determination of persulphate using photochemical exchange reaction of sodium nitroprusside (SNP) has been investigated. It is an inexpensive, faster and convenient quantitative method. Sodium nitroprusside is a photolabile complex which undergoes photochemical ligand exchange reactions rapidly. Some recent efforts have been made to utilise such reactions for the estimation of some nitrogen containing anions and electron rich organic molecules. The progress of the reaction is observed spectrophotometrically. The effects of different parameters like pH, change of concentration of sodium nitroprusside, concentration of ligands, light intensity etc. on percentage error was investigated. The efforts were made to minimise the percentage error and some optimum conditions were obtained. Such reaction can be used for the determination of persulphate in the range of millimoles to micromoles; hence it is important to know whether such estimations can be done successfully and that too with the desired accuracy.

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