四、阴离子交换树脂法用阴离子交换树脂来反吸附土壤固相表面活性磷,然后淋洗测定。这种方法在性质上也属于物理化学方法,经过20多年研究,本法在理论上愈趋成熟,手续较之其他物理化学方法简便得多;测定结果与多种标准方法结果之间具有极良好的相关性。故本法是一种最具有实际应用价值的速效磷物理化学测定法。 Fourth, the anion exchange resin method Anion exchange resin to adsorb the solid surface of solid-phase surface active phosphorus, and then leaching determination. This method also belongs to physicochemical methods in nature. After more than 20 years of research, this method has become more and more mature in theory. The procedure is much simpler than other physicochemical methods. The results of the determination are in good agreement with those of many standard methods Relevance. Therefore, this method is one of the most practical value of the available phosphorus physical and chemical assay.