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应用计算机对分光光度法测定土壤中微量元素Ｃｕ，Ｚｎ，Ｍｎ，Ｆｅ的吸光度进行分析处理（ＣＰＡ法），经Ｔ检验，测定结果小于Ｔ００５，与原子吸收分光光度法（ＡＡＳ法）无显著差异，概率保证的置信程度为：Ｃｕ２＋＞Ｆｅ２＋＞Ｍｎ２＋＞Ｚｎ２＋；ＣＰＡ法根据郎伯———比耳定律给出的混合溶液各组分吸光度的加和性，分别测定混合标准溶液和待测混合溶液的多波长吸光度，应用最小二乘法和矩阵运算方法，最大限度地减少了干扰和误差，方便、快速地计算出待测溶液的２～４个组分含量，本文附有使用的ＱＢＡＳＩＣ程序。
The absorbance of trace elements Cu, Zn, Mn, Fe in soil was determined by spectrophotometry (CPA method). The result of T test was less than T005, which was in agreement with that of atomic absorption spectrophotometry Significant differences, the probability of confidence in the degree of assurance: Cu2 +> Fe2 +> Mn2 +> Zn2 +; CPA method according to the Lambert --- Beer’s law given the sum of the absorbance of the mixed solution components were measured mixed standard solution and to be Measuring the multi-wavelength absorbance of the mixed solution, the least squares method and the matrix calculation method, minimizing the interference and error, convenient and rapid calculation of the solution to be measured 2 to 4 components, this article with the use of QBASIC program.