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测定全氮通常用酸溶法分解样品,此时,NO_3-N变成HNO_3逸出.当分析土壤样品时,这种损失一般都忽略不计.但对于某些含NO_3-N较高的农家肥料,例如粪肥、堆肥、陈墙土等,应该考虑NO_3-N的损失.一般用水杨酸固定NO_3-N,也有用Zn粉的.但是,北京农业大学编著的“农业分析”一书下册26页注明了没有观察出水杨酸固定NO_3-N的作用.作者研究了水杨酸固定NO_3-N的作用,对加试剂的次序和操作步骤作了一系列的变动.最后选定下述步骤:吸10毫
Determination of total nitrogen usually acid dissolution of the sample, this time, NO_3-N into HNO_3 escape when the soil samples are analyzed, the loss is generally negligible.However, some of the higher NO_3-N with farmers fertilizer , Such as manure, compost, Chen wall soil, etc., should consider the loss of NO_3-N .Salicylic acid is generally fixed with NO_3-N, but also useful for Zn powder.But Beijing Agricultural University, “Agriculture Analysis” a book The page states that no effect of salicylic acid on the immobilization of NO_3-N has been observed.The authors studied the effect of salicylic acid immobilization of NO_3-N and made a series of changes in the order and operation steps of the reagent.Finally, the following steps : Suck 10 milliliters