摘要
建立磷钒钼黄比色法测定复合肥料中聚合态磷含量的方法。在pH 12.0~12.5的条件下,用乙二胺四乙酸(EDTA)溶液提取肥料中有效磷(煮沸15 min);采用磷钼酸喹啉重量法测定有效磷,钼黄比色分光光度法测定正磷酸盐含量,计算得到聚合态磷的含量。实验结果表明,该方法具有准确度高、重现性好、操作简单等特点。
Phosphorous vanadium molybdate yellow colorimetric method is established to determine polymeric phosphorus in compound fertilizer. The available phosphorus is extracted from compound fertilizer by boiling 15 min with EDTA solution at pH of 12.0-12.5; Then the available phosphorus is determined by quinoline phosphomolybdate gravimetric method, orthophosphate is determined by vanadium molybdate yellow colorimetric method, difference of the two data is the amount of polymeric phosphorus. The results show that this method has a high degree of accuracy, good reproducibility, and it is also easy to operate.
引文
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