四苯硼酸钾重量法和火焰光度计法测定复混(合)肥中氧化钾含量比较

Potassium Oxide Content Comparison between Potassium Tetraphenylborate Gravimetric Method and Flame Photometer Method in Compound Fertilizer

本实验对比了四苯硼酸钾重量法和火焰光度计法测定复混（合）肥料中氧化钾的含量的差别。结果表明：1四苯硼酸钾重量法测得的结果明显高于火焰光度法。2四苯硼酸钾重量法的沉淀、烘干时间较长,回收率为97.6%~99.0%,精密度0.02%~0.5%;火焰光度法仅需0.5 h,精密度〈0.5%,回收率97.8%~98.3%,2种方法均可满足分析要求。32种方法测定结果可通过回归方法 Y=1.2 X修正,误差范围为0.01%~0.11%。

The experiment was conducted to compare the potassium oxide content differences between potassium tetraphenylborate gravimetric method and flame photometer method in compound fertilizer.The results showed that the measured values by potassium tetraphenylborate gravimetric method were significantly higher than those measured by flame photometer method.The potassium tetraphenylborate gravimetric method had longer setting and drying time with recovery ratio of 97.6% ~ 99.0%and precision of 0.02% ~ 0.5%; while the flame photometer method had the setting and drying time of 0.5 h with the precision of less 0.5% and the recovery ratio of 97.8% ~ 98.3%.Both of the two methods could meet analysis requirements.The analysis results can be amended by error-correction model Y=1.2X with error range of 0.01%~0.11%.