响应面法优化超声辅助提取土壤中的有效态铅镉锌镍铜

Ultrasonic Assisted Extraction of Available Lead,Cadmium,Zinc,Nickel and Copper from Soil by Response Surface Method

建立了响应面法-超声辅助提取土壤中5种有效态重金属的方法。试验在单因素基础上,根据Box-Behnken中心组合试验设计,采用三因素三水平数学模型和响应面法,考察各个因素对土壤中有效态重金属提取效果的影响。结果表明:有效态重金属超声辅助提取的最佳条件为:超声时间30 min;提取功率252 W;提取液pH 7.3。在选定的条件下有效态重金属提取率与环境部标准方法基本一致,且提取时间缩短至30 min。响应面法优化得到的提取条件操作简单,可作为土壤中有效态重金属提取的一种有效方法。

A response surface method-ultrasonic assisted extraction of five available heavy metals from soil was established.Based on the single factor experiment,the design of Box-Behnken central combination experiment,the effects of each factor on the effective extraction of heavy metals in soil were investigated by using three factors and three level mathematical model and response surface method.The results showed that the optimum conditions of ultrasonic assisted extraction of available heavy metals were as follows:ultrasonic time 30 min,extraction power 252 W,and pH 7.3.Under the selected conditions,the effective extraction rate of heavy metals is basically consistent with the standard method of the ministry of environment,and the extraction time is shortened to 30 min.The extraction conditions optimized by response surface method are easy to be obtained and can be used as an effective method for the extraction of available heavy metals in soil.