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稀土元素是我国丰产元素之一,矿区和冶炼厂有废水排出,要治理废水,需要测试废水中稀土的含量,目前未见报导.我们研究了CPAmN测试工业废水中铈组稀土的含量,以后再研究钇组稀土的测试方法.废水中含有许多其他离子,其中钙、钪、钛、钍和锆对测定有严重干扰,为了消除干扰,用PMBP萃取分离后再行测定. 过去用苯或氯仿做PMBP的溶剂,因其毒性大,有害于人体健康,我们用石油醚代替苯或氯仿,在给定条件下,等体积、一次萃取入有机相,再用等体积pH1.9甲酸溶液反萃取,除钐的回收率为84%外,其余铈组稀土均在90%以上.比耳定律的范围为0～12微克铈.铈的摩尔吸光系数为8.5×10~4升/摩尔·厘米;Sandell灵敏度为0.00165微克铈/厘米~2.以河水和工业废水为例,铈的回收率在95.8～100.3%之间,对测定结果感到满意.
Rare earth elements are one of the high yielding elements in our country, there are waste water discharged from mining areas and smelters, so it is necessary to test the content of rare earth in waste water to treat waste water, so far we have not reported.We studied the content of rare earth in cerium group in CPAmN test industrial waste water Study of yttrium group of rare earth test method.Wastewater contains many other ions, of which calcium, scandium, titanium, thorium and zirconium on the determination of serious interference, in order to eliminate interference, with PMBP extraction and determination before the line with benzene or chloroform to do PMBP solvent, because of its toxicity, harmful to human health, we use petroleum ether instead of benzene or chloroform, under the given conditions, the same volume, once extracted into the organic phase, and then an equal volume of pH1.9 formic acid solution back-extraction, Except that the recovery rate of samarium was 84%, all other rare earth cerium groups were over 90% .The Beer’s law ranged from 0 to 12 micrograms cerium.The molar extinction coefficient of cerium was 8.5 × 10 ~ 4 l / mol · cm. Sandell Sensitivity of 0.00165 micrograms of cerium / cm ~ 2. To river water and industrial wastewater, for example, the recovery rate of cerium between 95.8 ~ 100.3%, the results were satisfied.