Institute of Environmental Science and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Sector H-12, Islamabad 44000, Pakistan.
J Anal Methods Chem. 2012;2012:823016. doi: 10.1155/2012/823016. Epub 2012 Feb 29.
This paper illustrates systematic development of a convenient analytical method for the determination of chromium and cadmium in tannery wastewater using laser-induced breakdown spectroscopy (LIBS). A new approach was developed by which liquid was converted into solid phase sample surface using absorption paper for subsequent LIBS analysis. The optimized values of LIBS parameters were 146.7 mJ for chromium and 89.5 mJ for cadmium (laser pulse energy), 4.5 μs (delay time), 70 mm (lens to sample surface distance), and 7 mm (light collection system to sample surface distance). Optimized values of LIBS parameters demonstrated strong spectrum lines for each metal keeping the background noise at minimum level. The new method of preparing metal standards on absorption papers exhibited calibration curves with good linearity with correlation coefficients, R(2) in the range of 0.992 to 0.998. The developed method was tested on real tannery wastewater samples for determination of chromium and cadmium.
本文阐述了利用激光诱导击穿光谱（LIBS）系统地开发一种用于测定制革废水中铬和镉的简便分析方法。采用一种新方法，通过吸收纸将液体转化为固相样品表面，然后进行后续的 LIBS 分析。优化后的 LIBS 参数值为：铬为 146.7 mJ，镉为 89.5 mJ（激光脉冲能量）、4.5 μs（延迟时间）、70 mm（透镜到样品表面的距离）和 7 mm（收集系统到样品表面的距离）。优化后的 LIBS 参数值为每种金属提供了较强的谱线，同时将背景噪声保持在最低水平。在吸收纸上制备金属标准的新方法显示出校准曲线具有良好的线性，相关系数 R(2)在 0.992 到 0.998 范围内。该方法已在实际制革废水样品中用于测定铬和镉。
