【摘要】 因为"干法"含磷复肥是含酸解磷剂与磷矿粉的混合物,故测定该产品有效P2O5需用质量分数2%柠檬酸溶液作提取液(一次提取即可)或用质量分数3.75%EDTA二钠盐溶液进行两步提取,均可得到正确结果,不能用质量分数20%柠檬酸铵溶液作为提取液,并对此问题进行了讨论与说明。更多还原

【Abstract】 Based on the dry-process phosphorus-contenting compound fertilizer as a mixture containing acidolysis phosphorus agent and ground phosphate rock,the determination on available P2O5 is needed to use either mass fraction 2% citric acid(one-step process)or mass fraction 3.75% EDTA Na salt solution (two-step process)as extract agent,the mass fraction 20% ammonium citrate solution not as extract agent,and these are discussed and description.更多还原