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土壤中有机质的测定是测定土壤样品的主要项目之一。所用FeSO_4标准溶液中的Fe~(2+)易被氧化成Fe~(3+)而在再次使用之前都必须先标定或重新配制。这不仅麻烦而且也浪费FeSO_4试剂。如果能解决这个问题,将给分析工作带来很大的方便。笔者在FeSO_4标准溶液加入0.15%的铝片效果很好。具体做法如下:
The determination of organic matter in soil is one of the main items in the determination of soil samples. The Fe ~ (2 +) in the FeSO_4 standard solution is easily oxidized to Fe ~ (3 +) and must be calibrated or reconstituted before reuse. This is not only troublesome but also a waste of FeSO4 reagent. If we can solve this problem, it will bring great convenience to the analysis. The author of 0.15% aluminum in the FeSO_4 standard solution works well. Specific practices are as follows: