Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.
Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States.
Anal Chem. 2020 Apr 7;92(7):4949-4953. doi: 10.1021/acs.analchem.9b05058. Epub 2020 Mar 9.
A novel method for quickly and quantitatively measuring aqueous lead in drinking water has been developed. A commercially available activated carbon felt has been found to effectively capture lead from tap water, and partnered with X-ray fluorescence (XRF) spectrometry, it provides quantitative measurement of aqueous lead in drinking water. Specifically, for a 2 L volume of tap water, the linear range of detection was found to be from 1-150 ppb, encompassing the current EPA limit for lead in drinking water (15 ppb). To make a reproducible and easy to use method for filtering, a 2 L bottle cap with a 1.25 cm diameter hole was used for filtering. Utilizing this filtration method, 75 solutions from 0 to 150 ppb lead gave a 91% sensitivity, 97% specificity, and 93% accuracy, and all the misclassified samples fell between 10 and 15 ppb. This method has also proved reliable for detecting calcium as well as several other divalent metals in drinking water including copper, zinc, iron, and manganese.
一种快速定量测量饮用水中铅的新方法已经开发出来。研究发现，市售的活性炭毡能有效地从自来水中捕获铅，与 X 射线荧光（XRF）光谱仪结合使用，可对饮用水中的铅进行定量测量。具体来说，对于 2 升体积的自来水，检测的线性范围为 1-150 ppb，涵盖了目前美国环保署对饮用水中铅的限制（15 ppb）。为了制作一种可重复使用且易于使用的过滤方法，使用带有 1.25 厘米直径孔的 2 升瓶盖进行过滤。利用这种过滤方法，对 0 至 150 ppb 铅的 75 种溶液进行检测，得到 91%的灵敏度、97%的特异性和 93%的准确性，所有误分类的样本都落在 10 至 15 ppb 之间。该方法还可可靠地检测饮用水中的钙以及其他几种二价金属，包括铜、锌、铁和锰。
