RAPID ESTIMATION OF BASE‐EXCHANGE PROPERTIES OF SOIL
RAPID ESTIMATION OF BASE‐EXCHANGE PROPERTIES OF SOIL
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DOI：
10.1097/00010694-194201000-00001
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发表时间：
1942-01
期刊：
影响因子：
--
通讯作者：
A. Mehlich
中科院分区：
文献类型：
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作者：
A. Mehlich
众所周知，涉及金属阳离子的土壤的碱交换反应相对较快。然而，土壤胶体中的氢离子被中性盐替换得非常缓慢，而且只有很小的程度。由于我们的大多数农业土壤含有氢离子，这些交换反应的速度随存在的可交换氢的量而变化。前面的参考文献（4）已经对碱交换容量和可交换氢的快速测定进行了研究。在几乎所有测定土壤中可交换阳离子的快速化学方法中，都使用酸或盐和酸的混合物（3，6）。碱交换容量和可交换氢通常不通过这些方法测定，而仅仅是可交换金属阳离子的近似量。这些数据通常不足以准确地估计土壤的盐基交换特性。本文提出的快速、近似测定碱交换容量和可交换氢的方法，是以本文和其他文献（4、5）中的结果为基础的。除了详细描述该方法外，还包括各种实际应用。本文对钡的容量法测定作了较详细的叙述。
It is well known that base-exchange reactions of soil involving metal cat-ions are relatively rapid. The hydrogen ions of soil colloids are, however, replaced very slowly and only to a small extent by neutral salts. Since most of our agricultural soils contain hydrogen ions, the rapidity of these exchange reactions varies with the amount of exchangeable hydrogen present. Previous reference (4) has been made to the rapid determination of base-exchange capacity and exchangeable hydrogen. In nearly all the rapid chemi-cal methods for determining exchangeable cations in soil, acids or mixtures of salts and acids are employed (3, 6). Base-exchange capacity and exchange-able hydrogen are not usually determined by these methods, but merely the approximate amounts of exchangeable metal cations. Such data are usually insufficient to estimate accurately the base-exchange properties of a soil. The method for the rapid, approximate determination of base-exchange capacity and exchangeable hydrogen, herewith proposed, is based on the results shown in this and other papers (4, 5). In addition to a detailed de-scription of the method, various practical applications are included. A detailed description of the volumetric determination of barium is given.