聚磷酸铵中磷含量的测定方法研究

通过对测定肥料中磷含量3种标准的不同方法的差异对比，并对含短链低聚磷酸铵的肥料样品进行实际检测，结果表明：测得的磷（以P2O5计）含量明显不同；HG／T2770--2008测得的数据高于另外2种标准，符合样品实际含量；GB／T8573--2010和NY／T1977--2010测得的数据明显低于实际含量。对于添加短链低聚磷酸铵的肥料，测定水溶肥料磷含量的方法建议按HG／T2770--2008进行，并对NY／T1977--2010标准中磷的测定方法加以修订改进，以适应国内肥料市场的进一步发展。

Study of Method for Determination of Phosphorus Content in Ammonium Polyphosphate

Discrepancy exists in different methods for the determination of phosphorus content in fertilizers based on 3 standards and is compared, and actual detection is carried out of fertilizer samples containing short-chain low-polymer ammonium phosphate. Results show that the phosphorus （ as P2O5 ） content determined is markedly different ; the data obtained by HG/T 2770--2008 is higher than those of the other two standards but agree with the actual content of the sample ; those by GB/T 8573--2010 and NY/T 1977--2010 are markedly lower than the actual content. For fertilizers with the addition of short-chain low-polymer, the methods for determination of water-soluble fertilizer phosphorus content are suggested to follow HG/T 2770--2008, the methods for phosphorus determination by NY/T 1977--2010 are rexised and improved, to be adaptable to the further development of the domestic fertilizer market.