两种不同还原剂对Olsen-P测定值的影响

Effect of Two Different Reducing Agents on Value of Olsen-P Detection

对少量样品同一浸出液分别用氯化亚锡和抗坏血酸作还原剂，测定ＯＬｓｅｎ－Ｐ值。结果表明，在稳定时间内，这两种体系的Ｏｌｓｅｎ－Ｐ值相近，经ｔ检验，差异不显著；但ＳｎＣｌ２－ＨＣｌ体系超过稳定时间１０ｍｉｎ，Ｏｌｓｅｎ－Ｐ值已降低，经ｔ检验，差异达极显著水平。故ＳｎＣｌ２体系不适宜大批量样品的测定，而应采用钼锑抗体系。

Stannous chloride and ascorbic acid were applied as reducing agents to the same extractive material of a small amount of sample soil for detecting the Olsen-P value. The results show that within the time of stable coloration the Olsen-P values with two methods were close to each other and there was no significant difference between them as demonstrated by t test. But with SnCl2-HCl method the Olsen-P value decreased after 10 minutes of stable coloration and there was a significant difference between it and that of molybdenum-antimony-ascorbic acid method as demonstrated by t test. So the SnCl2 method is not suitable for detection of large amount of samples while the molybdenum-antimony-ascorbic acid method can be adopted without problem.