几种有机酸对广东共和花岗岩风化壳样品中稀土元素的浸泡实验结果表明:①稀土的浸出量随酸浓度的增加而明显升高;②低浓度的有机酸对稀土的浸出量随着水岩比的增加而增加;③有机酸与风化壳样品的作用结果导致介质的pH值会发生变化,大多数是pH值升高;稀土的浸出量随着pH降低有升高的趋势;④与硫酸铵所浸出的稀土相比,有机酸对风化壳稀土的浸出结果是Ce负异常减弱,Eu负异常增加,(La/Sm)N和(Gd/Yb)N比值相对减少,即有机酸对风化壳稀土分异作用作出了贡献.
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