Modification of the standard method for determination of non-exchangeable NH 4 -N in soil
Modification of the standard method for determination of non-exchangeable NH 4 -N in soil
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DOI：
10.17221/575/2012-pse
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发表时间：
2018-02
影响因子：
2.4
通讯作者：
P. Beuters;H. Scherer
中科院分区：
文献类型：
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作者：
P. Beuters;H. Scherer
众所周知，非交换性NH4-N在农田土壤氮素动态中起着重要作用。然而，广泛使用的Silva/Bremner法测定这一N组分非常耗时，而且使用有害的氢氟酸(HF)是必不可少的。在改进中，避免了使用氢氟化氢，单位时间的分析样品量可增加2.5倍。土壤样品经KOBr处理破坏土壤有机质后，干燥处理，用CNS分析仪测定土壤中非交换性NH4-N的含量。对4种不同土壤中的3种土壤的分析结果表明，两种方法没有显著差异。
It is well accepted that non-exchangeable NH 4 -N plays an important role in the N dynamics of arable soils. However the widely-used Silva/Bremner method for determining this N fraction is very time consuming and the use of the hazardous hydrofluoric acid (HF) is indispensable. In the modification the use of HF is avoided and the quantity of analysed samples per unit of time could be increased by a factor of 2.5. After pretreating soil samples with KOBr to destroy soil organic matter soil samples are dried and the content of non-exchangeable NH 4 -N is measured using a CNS analyzer. The results of the analysis of 3 out of 4 different soils show no significant differences between both methods.