浊点萃取-火焰原子吸收光谱法测定水样中的微量钴

文章研究了浊点萃取-火焰原子吸收光谱法测定微量钴。以8-羟基喹啉（8-HQ）作为钴的络合剂，以Triton X-100为表面活性剂进行浊点萃取。探讨了影响浊点萃取的因素，如溶液的pH,络合剂的浓度，表面括性剂的浓度，缓冲溶液的浓度，加入表面活性剂后的平衡温度和时间。该方法具有低毒，高效，安全，简便等特点，并用于自来水、湖水、江水、雨水中微量钴的溯定，其富集率最高可达100％，回收率在90％～100％之间，方法可行。

Determination of Trace Cobalt by Use of Flame Atomic Absorption Spectrometry after Preconcentration by Cloud-Point Extraction

Cloud-Point Extraction for determination of trace amounts of Cobalt in water sample by flame atomic absorption spectrometry was studied. It was based on cloud-point extraction using 8-HQ as complex and using Triton X-100 as surfactant. The optimization step was performed involving the factors such as solution pH, complex concentration, volume of surfactant, buffer solution concentration. After adding surfactant, temperature and time of equilibrium were discussed. The procedure was high efficiency and safe. It can be used in determination of traces of Cobalt and Copper in tap water, lake water, river water, rain easily. The ratio of preconcentration can be up to 100 %, and the recovery was 90 %-100 %. It showed that the method was satisfactory.