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为了提高土壤样品中全磷和全钾含量的检测效率,研究了连续流动法在土壤全磷、全钾含量测定中的应用,对土壤样品的前处理条件和连续流动法测定土壤样品中全磷、全钾含量的回收率、精确度进行了试验,并与国标法的测定结果进行了比较。结果表明,采用硝酸-氢氟酸-高氯酸体系微波消解,连续流动法测定土壤样品中全磷、全钾含量较理想,连续流动法在土壤样品中全磷、全钾含量的检测效率及方法稳定性上具备优势。方法的相对标准偏差全磷在0.06%~2.28%、全钾在0.03%~1.66%;全磷、全钾的检出限分别为0.01、0.05 g/kg,平均回收率分别为99.7%、105.2%;该方法的测定结果与国标法无显著性差异。方法为土壤中全磷、全钾的检测提供了一种快速、高效的检测分析方法,对土壤中全磷、全钾大量样品的检测和快速指导生产具有现实意义。
In order to improve the detection efficiency of total phosphorus and total potassium in soil samples, the application of continuous flow method in the determination of total phosphorus and total potassium in soil was studied. The pretreatment conditions of soil samples and the determination of total phosphorus in soil samples by continuous flow method , The recovery of total potassium content, the accuracy of the test, and with the national standard method of determination results were compared. The results showed that the determination of total phosphorus and total potassium in soil samples by microwave digestion and continuous flow method with nitric acid-hydrofluoric acid-perchloric acid system was better. The detection efficiency of total phosphorus and total potassium in soil samples by continuous flow method and Method stability has advantages. The relative standard deviation of the method was 0.06% -2.28% for total phosphorus and 0.03% -1.66% for total potassium. The detection limits of total phosphorus and total potassium were 0.01,0.05 g / kg and the average recoveries were 99.7% and 105.2%, respectively %; The method of determination results and national standard method no significant difference. The method provides a rapid and efficient method for the determination of total phosphorus and total potassium in soil, and has practical significance for the detection and rapid guidance of a large number of samples of total phosphorus and total potassium in soil.