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| Rapid determination of available P2O5 in DAP by vanadium molybdenum yellow colorimetry |
| Du Jing, Wang Rong |
| Fengfeng Center of Product Quality Inspection, Handan 056200, China |
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Abstract The P2O5 content in DAP was determined by vanadium molybdenum yellow colorimetry, EDTA solution was 60℃ as the extraction liquor for available P2O5, the PO43- ion extracted from phosphoric aid can react with ammonium molybdate and metavanadate in acid medium to from stable yellow coordination compound. So, the extraction time is more than 10 minutes, the addition amount of chromogenic agent is 10 mL, and the determination wavelength is 440 nm. The results show that the relative standard difference(RSD) is 0.13% ~ 0.32%, and the recovery of the method is 97.6% ~ 102.4%,and the method has good precision and high accuracy.
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