I have read many people cited Fiske and Subarrow method [1] for measure phosphate solubilization ability of bacteria. I also found that some people also use Murphy and Riley [2] and APHA 4500-P-C Vanadomolybdophosphoric acid Colorimetric Method [3] for performing it.

Which one that more reliable and acceptable? Does anybody have suggestions about it?

References:

1. Fiske CH, Subarrow Y, 1925, The colorimetric determination of phosphorus, J Biol Chem, 66:375–400, Article The Colorimetric Determination of Phosphorus

2. Murphy J, Riley JP, 1962, A modified single solution method for the determination of phosphate in natural waters. Anal Chim Acta 27:31–36, Article Determination of phosphate in natural waters. Ann Chim Acta 27: 31-36

3. APHA, 1992, APHA 4500-P-C Vanadomolybdophosphoric acid Colorimetric Method, https://beta-static.fishersci.com/content/dam/fishersci/en_US/documents/programs/scientific/technical-documents/white-papers/apha-phosphates-standard-methods-white-paper.pdf