应用离子交换树脂的測磷方法,已經有不少人进行过研究,显然它是一条簡便,快速的分析途径。但文献中記載的一些方法,还有一定的困难和局限性,使得应用交换树脂的測磷方法,至今未能普遍运用。如交换分离后的磷酸銨鎂重量法,操作仍然繁瑣費时;交换分离的二次碱滴定法,由于滴定产物本身是一个强的緩冲剂,所以滴定終点很不明显,虽采用終点对照液(往往与样品溶液終点顏色不 Application of phosphorus ion exchange resin method, there have been many people conducted a study, apparently it is a simple and rapid way of analysis. However, some of the methods documented in the literature still have some difficulties and limitations. Therefore, the method of measuring phosphorus by using exchange resins has not been universally applied so far. Such as exchange after the separation of ammonium phosphate gravimetric method, the operation is still tedious and time-consuming; Exchange of separate secondary titration, the titration product itself is a strong buffer, so titration end point is not obvious, although the end of the control solution ( Often the color with the end of the sample solution is not