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1.近百个红黄壤类土壤标本的分析结果表明,我国酸性土壤的代换性酸主要是由铝离子所引起。代换性氢量一般都很少,仅占总酸度的(?)1—3%,只有在土壤含有大量有机质时,氢量才可超通每100克土壤中0.1毫当量。土壤pH 在5.5以上时,代换性铝量即很少。2.滴定曲线和氢铝的转化试验指明,在人为地制成氢质土壤后,代换性氢也会逐渐为铝离子所代替,这种转化过程进行极快,主要发生于最初的一小时内。有机质含量对氢铝的转化速度有一定影响,土壤的有机质含量愈高,则转化速度愈慢。3.土壤用酸处理以去除一部分易分解的铝以后,非代换性铝转化成代换性状态者的速度减低。但是即使在用浓酸处理以使晶格受到剧烈破坏以后,仍有大量铝迅速转化为代换性状态,说明晶格中的铝也可与氢相代换。4.各种土壤中的代换性铝易于被KCl 溶液代出的程度(活动度)是不同的,高者97%,低者仅30%;在灼烧以后,活动度降低。5.作者根据所得的试验结果而认为,氢质土是不稳定的,在自然情况下,即使有氢离子进入土壤的吸收复合体,也会逐渐为铝离子所代替。
Nearly a hundred red-yellow soils soil samples analysis results show that China’s acid soil replacement acid is mainly caused by aluminum ions. Replacement of the amount of hydrogen are generally very small, only accounting for the total acidity (?) 1-3%, only in the soil contains a large amount of organic matter, the amount of hydrogen can be exceeded per 100 grams of soil 0.1 milliequivalents. When the soil pH is above 5.5, the amount of substitutional aluminum is very small. 2. The titration curve and the conversion experiments of aluminum and aluminum show that after artificially making hydrogen-containing soil, the substitutional hydrogen will gradually be replaced by the aluminum ion. The conversion process is very fast, mainly occurring in the first hour Inside. The content of organic matter has a certain influence on the conversion rate of aluminum and aluminum. The higher the organic matter content of soil, the slower the conversion rate. 3. When the soil is treated with acid to remove some of the readily decomposable aluminum, the rate at which non-substituted aluminum is converted into substitution is reduced. However, even after treatment with concentrated acid to severely damage the crystal lattice, a large amount of aluminum is still rapidly converted to an alternative state, indicating that aluminum in the crystal lattice can also be exchanged with the hydrogen phase. The degree (activity) of substitutional aluminum in various soils is easily replaced by KCl solution, with the highest being 97% and the lowest being only 30%. After burning, the activity decreased. 5. Based on the results of the tests obtained, the authors believe that hydrogenous soil is unstable and that in the natural case, hydrogen ions are gradually replaced by aluminum ions even if they enter the soil’s absorption complex.