有机质四种检测方法的比较及影响因素研究

A Comparison among Four Test Methods for Organic Matter and Its Influence Factors

以不同种类有机物为对象,分别用灼烧法、国标GB18877-2002、行标NY/T525-2002及油浴法检测,比较不同检测方法所得有机质含量的差异及检测影响因素。结果表明:不同有机肥的氧化校正系数不同,由有机肥所含还原物质的多少和氧化难易程度共同决定;油浴法和NY/T525-2002法有机质氧化温度较高,氧化较彻底,与灼烧法比较,校正系数值为1.25～1.37;GB18877-2002法水浴温度较低,氧化效果相对要差,与灼烧法比较,校正系数值1.23～1.45;含氯化肥,尤其是氯化铵对有机质检测结果影响较大。

In order to find out the difference of organic matter contents from different test methods and influencing factor for these test methods, the burning method, the national standard （GB18877-2002）, the Industry Standard （NY/ T525-2002） and oil bath assay were used for test different types of organic matter, respectively. The results indicated that the oxidation correction coefficient of different organic fertilizer is different, which is determined by the content of reducing matter in organic fertilizer and the difficulty of oxidation; in comparison with burning method, the oil bath assay and NY/T525-2002 method have higher oxidation temperature and more complete oxidation with 1.25～1.37 of correction coefficient; in comparison with burning method, the GB18877-2002 method has lower bath temperature and worse oxidation effect with 1.23 ～1.45 of correction coefficient. The chlorine-containing fertilizers, especially ammonium chloride have large impact on test results.