In this paper,the influence for the measurement of the total phosphorus by ammonium molybdate spectrophotometric method was investigated. The result of the orthogonal experiment showed that the measurement of the total phosphorus was mainly influenced by digestive solution, while the influences of color-developing time, temperature and the pH of the water sample were minor. The optimal experimental condition is： pH = 7, the digestive solution is 4 ml, the color-developing temperature and time are 25℃ and 15 min respectively. Under the optimal condition,the recovery rate was in the range of 96. 28% - 103.03%.
Journal of Huizhou University
ammonium molybdate spectrophotometric method