[clevermartin]

In the Molybdate reactive phosphous method, reducing solution made of NaHSO₃, sodium sulfate and 1-amino-2-naphthol-4-sulphonic acid was used to reduce the phosphomolybdate complex into phosphate molybdenum complex for phosphorus content determination.

I want to ask is there any other method or reducing agent which can do the same reduction process correctly?

Thanks