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采用化学浸提方法,研究了5种低分子量有机酸(草酸、柠檬酸、酒石酸、苹果酸、乙酸)对不同合成磷源的释磷效应。结果表明:供试有机酸(低浓度乙酸除外)均能促进不同合成磷源(DCP、OCP、FA、Fe-P、A l-P)中磷素的释放;其释磷效果与有机酸的种类和浓度有关,强弱顺序依次为柠檬酸、草酸、酒石酸、苹果酸、乙酸,有机酸浓度越高其释磷效果越好;有机酸与氟磷灰石(FA)反应后,溶液pH值升高。低浓度条件下pH值变化较大,而高浓度条件下pH值变化较小。
The effects of five kinds of low molecular weight organic acids (oxalic acid, citric acid, tartaric acid, malic acid and acetic acid) on phosphorus release from different synthetic phosphorus sources were studied by chemical leaching method. The results showed that all the tested organic acids (excluding low concentration of acetic acid) promoted the release of phosphorus from different synthetic phosphorus sources (DCP, OCP, FA, Fe-P, AlP) Concentration, the order of strength was citric acid, oxalic acid, tartaric acid, malic acid and acetic acid. The higher the concentration of organic acid was, the better the phosphorus releasing effect was. The organic acid and fluorapatite (FA) . Under the condition of low concentration, the pH value changes a lot, while the pH value changes little under the condition of high concentration.