·554· 2023年第 43卷
化工环保
ENVIRONMENTAL PROTECTION OF CHEMICAL INDUSTRY
3 结论
a)本实验通过基于烷醇的超分子溶剂和涡旋
辅助分散,对水中的Cr(Ⅵ)进行萃取富集,采用
分光光度法测定其浓度,测定波长为545 nm。
b)在以癸醇与四氢呋喃的摩尔比为1∶1制
备的超分子溶剂为萃取剂、萃取剂用量为200 μL
(Cr(Ⅵ)溶液4 mL)、涡漩时间为2.0 min、氯化钠
加入量为0.25 g/mL的最优萃取条件下,取得了较宽
的线性范围(0.004~2.000 μg/mL),回归方程为y =
1.272 79x - 0.004 71,R2
为0.999 83,检出限为0.15
μg/L,定量限为0.45 μg/L,加标回收实验的回收率
为96.80%~103.50%,RSD为0.45%~2.50%。
c)该方法具有操作简单、溶剂用量少、灵敏
度高、精密度好、准确度高、萃取时间短的特点,
可较好地满足水中Cr(Ⅵ)的测定要求。
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