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为了研究含有配体乳酸的络合萃取体系的萃取分离效果,对LaCl3-乳酸(HLac)水溶液的紫外和红外光谱性质进行了分析。采用紫外吸收光谱法确定了镧与配体乳酸形成了配合物,并采用摩尔比法测定了配合物的组成,发现镧-乳酸水溶液中形成了1∶1和1∶2型配合物,即La(Lac)2+和La(Lac)+2。红外光谱分析表明,配合物中出现了羧酸盐特有的反对称伸缩振动吸收峰νas和对称伸缩振动吸收峰νs,配合物以羧基氧桥式双齿配位形式存在。
In order to study the extraction and separation of the complexed extraction system containing lactic acid, the UV and IR spectra of LaCl3-lactic acid (HLac) aqueous solution were analyzed. The complexes of lanthanum with lactic acid were determined by UV absorption spectroscopy. The composition of the complex was determined by molar ratio method. It was found that the lanthanum-lactic acid solution formed complexes of 1: 1 and 1: 2, ie La (Lac) 2+ and La (Lac) +2. Infrared spectrum analysis showed that the complex appeared in the carboxylate unique anti-symmetrical stretching vibration absorption peak νas and symmetrical stretching vibration absorption peak νs, the complex with carboxy oxygen bridge bidentate coordination form.