柠檬酸和琥珀酸提取牡蛎匀浆液中镉的研究

Study on the extraction of cadmium from Oyster homogenate by succinic acid and citric acid

摘要:

以琥珀酸和柠檬酸提取牡蛎匀浆液中的镉，并利用单因素试验和正交试验优化提取条件。结果表明，有机酸的pH对牡蛎匀浆液中镉的提取率影响最大，其次是料液比和时间。浓度和温度的影响因有机酸类型不同而有差异。琥珀酸提取镉的最佳条件如下：时间为2 h，温度为35 ℃，酸浓度为0.02 mol/L，料液比为1∶15，pH为2.0；柠檬酸提取镉的最佳条件如下：时间为2 h，温度为35 ℃，酸浓度为0.04 mol/L，料液比为1∶15，pH为2.5。在最佳条件下两种有机酸对牡蛎匀浆液中镉的提取率达到90.2%～91.8%。

Abstract:

The optimum conditions for the extraction of cadmium from Oyster homogenate by succinic acid and citric acid were determined using single facter and orthogonal array design methodology. The results showed that the pH value of organic acid has the maximal effect on extraction rate of cadmium in Oyster homogenate, followed by materialliquid ratio and extraction time. The effects of concentration and temperature on extraction rate were found to be slightly dependent on the type of organic acid. The optimal conditions to obtain the highest extraction rate by succinic acid and citric acid were 2 h, 35 ℃, pH 3.0, 0.02 mol/L of sucinic acid and 1∶15 of material to solution, as well as 2 h, 35 ℃, pH 2.5, 0.04 mol/L of citric acid and 1∶15 of material to liquid, respectively. Under these optimal conditions, extraction rate of cadmium from Oyster homogenate by the two organic acids reached up to 90.2%-91.8%.