Please tell me the assay method for calculation of phosphate in sodium hexametaphosphate

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Jeevan Babu Vallepu

UV spectrophotometric method suitable for measurement of phosphate. ammonium molybdate and ammonium vanadate react with phosphorous to form a yellow colour of ammonium phosphomolybdate. And measure the absorbence at 530 nm.

I think you will get maximum absorbence at 475 nm is best