研究了浮选剂十八胺(ODA)对Ca^2+，Mg^2+离子络合滴定的影响，主要进行了两组对比实验：(1)滴定前将十八胺固体不过滤，直接进行滴定分析。结果表明这种情况下，十八胺对Ca^2+和Mg^2+离子的络合滴定都有较大影响，Mg^2+离子的滴定终点难以判断，Ca^2+离子的滴定终点虽然可以判断，但与不含十八胺的相应空白溶液相比有明显的分析误差。对相关溶液的紫外-可见分光光度分析进一步确认了该实验结果。(2)滴定前将十八胺不溶物过滤掉，然后进行滴定分析。结果表明这种情况下，十八胺对Ca^2+和Mg^2+离子络合滴定的影响可以被基本消除。光谱扫描和时间扫描结果显示，滴定前将十八胺过滤后，对于Ca^2+和Mg^2+两种离子，溶液最大吸收的位置及溶液吸光度的变化情况都与无十八胺的空白溶液接近。

The effect of flotation agent octadecyl amine (ODA) on the complex titration of both magnesium and calcium ions was studied with two groups of comparative experiments： (1) Before titration, the suspension was not filtered. In this case, ODA had a great effect on the complex titration of both magnesium and calcium ions. The titration end-point of magnesium ions was difficult to he determined. Although the titration end-point of calcium ions could be determined, there was an obvious experimental error compared with the blank solution without ODA. These results were confirmed by the UV-Visible spectrum analyses of the related solutions. (2) Before titration, the suspension was filtered. In this case, the influence of ODA on the complex titration of both magnesium and calcium ions could be removed. UV-Visihle spectrum studies showed that, in this case, both the spectra and time scanning curves of the tested solutions were similar to those of the blank solutions.