原子吸收分光光度法测定复混肥料中高含量钾

国标中采用四苯基合硼酸钾重量法测定复混肥料中的钾含量，2次测定结果允许相差0.20%。用原子吸收分光光度法测定钾含量是经典方法，但测定高含量的钾，而且精度要达到常规重量法的水平则较为困难。本方法通过选择合适的测定条件、仪器参数，解决了这一问题。

Determination of Higt Potassium Content in Compound Fertilizers by Atomic Absorption Spectrophotometry

In line with the national standard, the potassium content in compound fertilizers is determined by gravimetry with tetraphenyl potassium borate, and the permissible error of two results of determination is 0.20%. The determination of potassium content by atomic absorption spectrometry is a classic method, but for the determination of high potassium content it is difficult to reach the level of routine gravimetry in precision. This method has solved the problem by the selection of appropriate conditions of determination and instrument paraneters.