土壤农化分析中 ,常规分光光度法测量微量元素时常遇到待测液浓度过稀 ,比色结果低于最低色阶 ,而认为被测浓度在标准曲线以外 ,得不到可确认的数据的情况。经作者多次用标准溶液添加法或称以浓测稀法操作发现可以得到补救。现举一例以作参考 :1　土样 :预东薄地小麦田 ,黄潮土 Soil analysis, the conventional spectrophotometric method of measuring trace elements often encountered the test solution concentration too thin, the colorimetric results below the minimum level, and that the measured concentration outside the standard curve, can not be confirmed data Happening. The author repeatedly with the standard solution to add method or concentration test thinning method found to be remedied. Take an example for reference: 1 soil samples: Pre-thin wheat fields, yellow soil