外加锌在土壤中形态的研究

本文采用化学逐级提取法对吸附锌后的土壤分别提取了交换态、CaCO_3结合态、氧化物结合态和有机质结合态的锌量,并讨论pH、温度和溶液中锌离子浓度对不同形态锌分布的影响。实验结果表明:外加锌被石灰性土壤吸附后,高pH值(7.5)时形态分布为:CaCO_3结合态≥交换态>氧化物结合态>有机质结合态;低pH值(5.5)时则为:交换态>CaCO_3结合态>氧化物结合态>有机质结合态。各形态锌的分配系数还受到吸附时的温度和溶液中锌离子浓度的影响。

STUDY ON FORMS OF ADDED Zn IN SOIL.

In this paper,a sequential extraction procedure was used to determine the forms of Zn added in soil as follows i exchangeable ibound to carbonates,bound to oxides and bound to organic matter. The effects of pH,temperature and Zn concentration in solution on distribution of each form of Zn were investigated. The resuls obtained show that the distribution of Zn forms in terms of percentage is in the order, bound to carbonates >>exchangeable>bound to oxides>bound to organic matter at pH7.5; or exchangeable>bound to carbonates> bound to oxidesl>bound to organic matter at pH 5. 5. The experimental data also showed that temperature and Zn concentration have great influence on the distribution of forms of Zn added in soil.