用磷钼蓝分光光度法测定煤中磷的影响因素分析

Analysis of influencing factors of using phosphorus molybdenum blue spectrophotometric method to determine phosphorus in coal

结合磷钼蓝分光光度法的原理、测定步骤及煤中磷测定的实际经验,从灰样酸解、待测溶液的吸取体积、显色温度控制、显色时间控制、混合溶液的现用现配、杂质元素的干扰、氢氟酸的使用等方面探讨了磷钼蓝法测定煤中磷的影响因素,以确保提高磷钼蓝分光光度法测定煤中磷含量的准确度。

Combined with the principle and determination steps of phosphorus molybdenum blue spectrophotometric method, and practical experience of determining phosphorus in coal, the influencing factors of determining phosphorus in coal using phosphorus molybdenum blue spectrophotometric method was discussed in this paper from aspects such as ash sample acid solution, absorbing volume of test solution, coloration temperature and time control, mixing solution making when needed, interference of impurity element, use of hydrofluoric acid.So the accuracy of determination of phosphorus content in coal could be improved.