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作 者 ：夏红霞, 朱启红

期 刊 ：植物营养与肥料学报 2010年 16卷 6期 页码：1448-1455

关键词：腐植酸；Cr(Ⅵ)；吸附；潜在去除率；

Keywords:humic acid, Cr (VI), adsorption, potential removal rate,

摘 要 ：在单因素试验基础上，采用二次回归正交旋转组合设计对腐植酸去除土壤中Cr(Ⅵ)进行了优化，建立了土壤Cr(Ⅵ)潜在去除率与HA浓度（x₁）、pH(x₂)、反应接触时间(x₃)和反应温度(x₄)四个因素间的正交回归模型: Y=60.27012-2.22158X₁+2.92002X₃-4.29138X²₁-2.53068X²₂-2.00566X²₄-2.35375X₁X₂+3.68250X₁X₃-1.99875X₁X₄-1.99875X₂X₃+3.68250X₂X₄-2.35375X₃X₄。从模型推知，当HA浓度为1.86 g/L、pH值5.5、振荡时间为8.6h和反应温度25.2℃时，土壤中Cr(Ⅵ) 潜在去除率最大，达80.0%。验证结果与模型值相符。

Abstract:A single factor experiment was conducted to optimize the adsorption of soil Cr(Ⅵ) in soil by humic acid using a quadratic regression orthogonal rotation combination design. The quadratic orthogonal regression model of removal rate of Cr(Ⅵ) in soil(y) to four factors of humic acid (HA) dosage (x₁), pH(x₂), reaction time (x₃) and reaction temperature(x₄) was established as: Y=60.27012-2.22158X₁+2.92002X₃-4.29138X²₁-2.53068X²₂-2.00566X²₄-2.35375X₁X₂+3.68250X₁X₃-1.99875X₁X₄-1.99875X₂X₃+3.68250X₂X₄-2.35375X₃X₄. The optimal condition for Cr removal based on the model was: HA 1.86 g/L, pH 5.5, reaction time 8.56 h and reaction temperature 25.22℃. Under this condition, the y reached the maximum (80.0%), which was coincided with our experimental result.

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