Determination of heavy metals in activated charcoals and carbon black for Lyocell fiber production using direct solid sampling high-resolution continuum source graphite furnace atomic absorption and inductively coupled plasma optical emission spectrometry

TALANTA

卷:81

Article

Lepri, Fabio G.¹  Borges, Daniel L. G.¹  Araujo, Rennan G. O.^1,2  Welz, Bernhard^1,3  Wendler, Frank⁴  Krieg, Marcus⁴  Becker-Ross, Helmut⁵ 

[1] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil

[2] Univ Fed Sergipe, Dept Quim, BR-49100000 Sao Cristovao, SE, Brazil

[3] Univ Fed Bahia, INCT Energia & Ambiente, CNPq, BR-40170115 Salvador, BA, Brazil

[4] Thuringian Inst Text & Plast Res, Ctr Excellence Polysaccharide Res, D-07407 Rudolstadt, Germany

[5] Dept Berlin, Leibniz Inst Analyt Sci, ISAS, D-12489 Berlin, Germany

关键词: Lyocell process;    Activated charcoal;    Trace element determination;    Direct solid sampling analysis;    High-resolution continuum source atomic absorption spectrometry;    Inductively coupled plasma optical emission spectrometry;   

DOI  :  10.1016/j.talanta.2010.01.050

来源: Elsevier

【 摘 要 】

Reactivity and concentration of additives, especially activated charcoal, employed for the Lyocell process, enhance the complexity of reactions in cellulose/N-methylmorpholine-N-oxide monohydrate solutions. Analytical control of the starting materials is a basic requirement to know the concentration of heavy metals, which are potential initiators of autocatalytic reactions. Seven activated charcoal and two carbon black samples have been analyzed regarding their content of seven elements, Cr, Cu, Fe, Mn, Mo, Ni and V using direct solid sampling high-resolution continuum source graphite furnace AAS (SS-HR-CS GF AAS) and inductively coupled plasma optical emission spectrometry (ICP OES) after microwave-assisted acidic digestion as a reference method. The limits of detection of the former technique are 1-2 orders of magnitude lower than those of ICP OES and comparable to those of more sophisticated techniques. For iron the working range of HR-CS GF AAS has been expanded by simultaneous measurement at two secondary absorption lines (344,099 nm and 344,399 nm). Partial least-squares regression between measured and calculated temperatures for beginning exothermicity (T-on) has been used to investigate the prediction capability of the investigated techniques. Whereas the ICP OES measurements for seven elements resulted in an error of prediction of 3.67%, the results obtained by SS-HR-CS GF AAS exhibited a correlation coefficient of 0.99 and an error of prediction of only 0.68%. Acceptable correlation has been obtained with the latter technique measuring only three to four elements. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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