DETERMINATION OF AMMONIUM IN KCL EXTRACTS OF SOILS BY THE SALICYLATE METHOD
DETERMINATION OF AMMONIUM IN KCL EXTRACTS OF SOILS BY THE SALICYLATE METHOD
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DOI：
10.1080/00103628309367431
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发表时间：
1983-01-01
影响因子：
1.8
通讯作者：
NELSON, DW
中科院分区：
文献类型：
--
作者：
NELSON, DW
本文介绍了一种直接测定土壤中2 M KCl浸提液中NH_4 ~+-N的方法，该方法是基于在高pH值下，在NaOCl存在下，NH_3与水杨酸盐反应形成的翠绿色绿色。当用显色剂处理含有二价阳离子的KCl浸提液时，通过向复合Ca 2+和Mg 2+中加入1 mL 6%EDTA消除了观察到的酒石酸盐形成。游离EDTA或络合的Ca ~（2+）或Mg ~（2+）对显色或摩尔吸光系数无明显影响。所提出的方法有效地恢复NH 4 +-N添加到2 M KCl提取物的土壤和研究表明，所提出的方法和其他2个程序不同的原则，得到了类似的值NH 4 +-N提取物的5种土壤。该方法简便、快速、准确、精密度高，可用于土壤KCl浸提液中NH ~（4+）-N的比色测定。
A method is described for the direct estimation of NH4+-N in 2 M KCl extracts of soils based on the emerald green color formed when NH3 and salicylate react in the presence of NaOCl at high pH. The reagent concentration, solution pH and time and temperature of color development specified are those giving maximum molar absorptivity. Precipitate formation observed when KCl extracts containing divalent cations were treated with color developing reagents was eliminated by addition of 1 mL of 6% EDTA to complex Ca2+ and Mg2+. Free EDTA or complexed Ca2+ or Mg2+ did not markedly affect color development or molar absorptivity. The proposed method efficiently recovered NH4+-N added to 2 M KCl extracts of soils and studies showed that the proposed method and 2 other procedures differing in principle gave similar values for NH4+-N in extracts of 5 soils. The proposed method is a simple, rapid, accurate and precise technique for the colorimetric determination of NH4+-N in KCl extracts of soils.