کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8954894 | 1646048 | 2019 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Feasibility of measuring Cr(III) and Cr(VI) in water by laser-induced breakdown spectroscopy using ceramics as the solid support
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Laser-induced breakdown spectroscopy (LIBS) is a multi-elemental technique with multiple advantages. However, direct determination in liquid samples is not an easy task since laser water interaction can affect the precision and accuracy of the method and cause loss of sensitivity. To enable LIBS application in liquid sample analysis, some strategies such as liquid-to-solid transfer have been used. This work proposes the quantification of chromium in water samples by LIBS using ceramic as the solid support. Results showed that the ceramic selectively adsorbs Cr(III) species at pHâ¯7 and quantification of Cr(VI) species by LIBS was also possible after reduction of this species to Cr(III) using Fe(II) as the reducing agent. Instrumental parameters were optimized, and the best conditions found included a 65â¯Î¼m spot size, 430 accumulated pulses with 20â¯mJâ¯pulseâ1, and 0.75â¯ms of delay time. Calibration was carried out with synthetic calibration standards prepared by adsorption of increasing concentrations of chromium in ceramic. Tap water samples spiked with 0.9â¯mgâ¯Lâ1 of Cr(III) and 0.1â¯mgâ¯Lâ1 of Cr(VI) were analysed by the proposed method and recoveries of 105â¯Â±â¯2% and 103â¯Â±â¯3% were obtained for Cr(III) and Cr(VI), respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microchemical Journal - Volume 144, January 2019, Pages 33-38
Journal: Microchemical Journal - Volume 144, January 2019, Pages 33-38
نویسندگان
Alexandrina A.C. Carvalho, Daniel M. Silvestre, Flávio O. Leme, Juliana Naozuka, Danielle P. Intima, Cassiana S. Nomura,