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选择小白菜和通心菜作为研究样品，在高温（１２０—１２４℃）高压（１０．８×１０４—１２．７×１０４Ｐａ）条件下，采用浓度为０．１ｍｏｌ／Ｌ的过硫酸钾作为氧化剂，进行总磷（ＴＰ）、总氮（ＴＮ）联合消解的研究，并按常规消解方法进行对比试验。结果表明，本文提供的联合消解法与常规消解法的ＴＰ、ＴＮ平均相对偏差分别为１．９％、０．７６％，平均加标回收率分别为９５．９５％、９０．６％。精密度试验结果表明，ＴＰ、ＴＮ的标准偏差分别为１．９×１０－３和９×１０－３，变异系数分别为８．３６％和８．４１％。
Choosing Brassica chinensis and Tongxinbai as research samples, using 0.1mol / L potassium persulfate as oxidant under high temperature (120-124 ℃) under high pressure (10.8 × 104-12.7 × 104Pa) , The total phosphorus (TP), total nitrogen (TN) combined digestion research, and according to the conventional digestion method comparative test. The results showed that the average relative deviations of TP and TN between the combined digestion method and the conventional digestion method were 1.9% and 0.76%, respectively. The average recoveries were 95.95% and 90.6% respectively. The results of the precision test showed that the standard deviations of TP and TN were 1.9 × 10-3 and 9 × 10-3, respectively, and the coefficients of variation were 8.36% and 8.41% respectively.