Determination of Trace lead (II) by Resonance Light Scattering Based on Pb (II)-KI-MG System

2017 International Conference on Advanced Environmental Engineering

生态环境科学

Chen, Ninghua^1 ; Yang, Yingchun^1 ; Hao, Shuai^1 ; Li, Yangmin^1

Chengdu University of Information Technology, Department of Resources and Environment, Chengdu, China^1

关键词: Environmental water samples;    Laboratory wastewater;    Linear relationships;    Reaction conditions;    Relative standard deviations;    Resonance light scattering;    Resonance scattering;    Weak acidic solution;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/111/1/012022/pdf
DOI  :  10.1088/1755-1315/111/1/012022

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In pH=3.0 weak acidic solution, it is found that Pb2+can react with I-to form [PbI4]2-, and it further reacted with MG to form ion-association complex. As a result, the new spectra of RLS appeared and their intensities enhanced greatly. Accordingly, a new method developed for the determination of Pb (II).The appropriate reaction conditions were optimized through experiments. The results show that a strong and stable resonance scattering spectra emerge at the wavelength of 338 nm. The resonance light scattering strength (ΔIRLS) has good linear relationship with the concentration of Pb (II) in the range of 0.2 μg/mL ∼ 1.0 μg/mL. The detection limits (LOD) is 0.0155 μg/mL. The relative standard deviation (RSD) is 3.61% (n=11) for the determination of 0.6 μg/mL Pb (II) standard solution. And this method was successfully applied to the determination of three environmental water samples (nongfu spring, tap water, laboratory wastewater). Results illustrate that the addition standard recovery are 80%∼107% with relative standard deviation (RSD) between 1.8% to 4.6%.