磷酸氢铈纳米吸附剂预富集-火焰原子吸收法测定水中痕量铅

摘要:目的　建立磷酸氢铈（CeP）一维纳米吸附剂预富集-火焰原子吸收法测定水体中痕量铅的新方法。方法　用10 mg CeP 对pH为2～9的200 ml水样中的Pb2+吸附富集30 min，抽滤后再用4.00 ml 2 mol/L的硝酸溶液解吸60 min，用火焰原子吸收法测定解吸液中的Pb2+。结果　该方法测定Pb2+的线性范围为10～400 μg/L，回归方程为y＝0.0011x + 0.0043，线性相关系数r＞0.999，检出限为1.14 μg/L，相对标准偏差为1.12%（n＝9，80 μg/L），加标回收率为99.8%～107.5%。结论　本方法线性范围宽，灵敏度高，准确度和精密度良好，操作条件简单，测定成本低，可应用于环境水样中痕量铅的测定。

Flame atomic absorption spectrometric determination of trace lead in water after preconcentration with nano cerium hydrogen phosphate

Abstract: Objective To establish a method for the determination of trace lead in environmental water by CeP preconcentration combined with flame atomic absorption spectrometry. Methods 10 mg CeP was used to adsorb Pb2+ for 30 min in 200mL water sample, with the pH range of 2 to 9. Then Pb2+ adsorbed on CeP was desorbed by 2 mol/L nitric acid for 60 min and detected by FAAS. Results The limit of detection for Pb2+ was 1.14 μg/L. The linear range of the determination was 10 ~ 400 μg/L with a correlation coefficient greater than 0.999. The precision was 1.12% (n = 9, 80 μg/L), and the recovery rates were 99.8% ~ 107.5%. Conclusion The method is selective, sensitive, accurate, reliable and feasible for the determination of trace lead in environmental water samples.