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研究了离子强度和SO2 - 4对土壤吸附Al的影响 ,结果表明 :在所研究的pH范围内 ,随着NaCl支持电解质浓度的提高 ,土壤对Al的吸附量基本保持不变 ,并且当pH <3 9时 ,即土壤表面净电荷为正时 ,土壤对Al的吸附量仍然很大 ,超过最大吸附量的 5 0 % ,而用CaCl2 作支持电解质时 ,当pH <4 5时 ,在溶液中CaCl2 浓度最高的情况下 ,Al的吸附量最小 ,在其余两种浓度条件下则基本相等 ;当pH >4 5时 ,Al的吸附量几乎不受CaCl2 浓度变化的影响 .SO2 - 4的加入对土壤吸附Al没有影响 .这些都说明土壤吸附Al的作用机制主要为专性吸附 .
The effects of ionic strength and SO2 - 4 on the adsorption of Al on soil were studied. The results showed that the adsorption capacity of Al on the soil remained unchanged with the increase of the concentration of supporting electrolyte in the investigated pH range. When pH < When the net charge on the soil surface is positive, the amount of Al adsorbed by the soil is still large, exceeding 50% of the maximum adsorption capacity. When CaCl2 is used as the supporting electrolyte, when the pH is less than 45, When the concentration of CaCl2 was the highest, the adsorption capacity of Al was the smallest, and the adsorption capacity of Al was almost the same under the other two concentrations. The adsorption capacity of Al was almost unaffected by the concentration of CaCl2 when pH> Soil adsorption of Al has no effect, which shows that the main mechanism of soil adsorption of Al is specific adsorption.