Analysis of metal-laden water via portable X-ray fluorescence spectrometry

被引:20
|
作者
Pearson, Delaina [1 ]
Weindorf, David C. [1 ]
Chakraborty, Somsubhra [2 ]
Li, Bin [3 ]
Koch, Jaco [4 ]
Van Deventer, Piet [4 ]
de Wet, Jandre [4 ]
Kusi, Nana Yaw [1 ]
机构
[1] Texas Tech Univ, Dept Plant & Soil Sci, Lubbock, TX 79409 USA
[2] Indian Inst Technol, Kharagpur, W Bengal, India
[3] Louisiana State Univ, Dept Expt Stat, Baton Rouge, LA 70803 USA
[4] Northwest Univ, Potchefstroom, South Africa
关键词
PXRF; Water analysis; Metals; DIFFUSE-REFLECTANCE SPECTROSCOPY; DRINKING-WATER; RAPID ASSESSMENT; SOIL PROPERTIES; PUBLIC-HEALTH; HEAVY-METALS; POLLUTION; SEDIMENTS; RISK; CONTAMINATION;
D O I
10.1016/j.jhydrol.2018.04.014
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A rapid method for in-situ elemental composition analysis of metal-laden water would be indispensable for studying polluted water. Current analytical lab methods to determine water quality include flame atomic absorption spectrometry (FAAS), atomic absorption spectrophotometry (AAS), electrothermal atomic absorption spectrometry (EAAS), and inductively coupled plasma (ICP) spectroscopy. However only two field methods, colorimetry and absorptiometry, exist for elemental analysis of water. Portable X-ray fluorescence (PXRF) spectrometry is an effective method for elemental analysis of soil, sediment, and other matrices. However, the accuracy of PXRF is known to be affected while scanning moisture-laden soil samples. This study sought to statistically establish PXRF's predictive ability for various elements in water at different concentrations relative to inductively coupled plasma atomic emission spectroscopy (ICP-AES). A total of 390 metal-laden water samples collected from leaching columns of mine tailings in South Africa were analyzed via PXRF and ICP-AES. The PXRF showed differential effectiveness in elemental quantification. For the collected water samples, the best relationships between ICP and PXRF elemental data were obtained for K and Cu (R-2 = 0.92). However, when scanning ICP calibration solutions with elements in isolation, PXRF results indicated near perfect agreement; Ca, K, Fe, Cu and Pb produced an R-2 of 0.99 while Zn and Mn produced an R-2 of 1.00. The utilization of multiple PXRF (stacked) beams produced stronger correlation to ICP relative to the use of a single beam in isolation. The results of this study demonstrated the PXRF's ability to satisfactorily predict the composition of metal-laden water as reported by ICP for several elements. Additionally this study indicated the need for a "Water Mode" calibration for the PXRF and demonstrates the potential of PXRF for future study of polluted or contaminated waters.
引用
收藏
页码:267 / 276
页数:10
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