Determination of Cu, Ni, Mn and Zn in diesel oil samples using energy dispersive X-ray fluorescence spectrometry after solid phase extraction using sisal fiber

TALANTA

卷:225

Article

Anjos, Shirlei L.¹  Almeida, Jorge S.^2,3  Teixeira, Leonardo S. G.^2,3  da Silva, Ana Cristina M.¹  Santos, Alane P.¹  Queiroz, Antonio F. S.⁴  Ferreira, Sergio L. C.^2,3  Mattedi, Silvana¹ 

[1] Univ Fed Bahia, Escola Politecn, BR-40210630 Salvador, BA, Brazil

[2] Univ Fed Bahia, Inst Quim, Dept Quim Analit, Campus Univ Ondina, BR-40170115 Salvador, BA, Brazil

[3] Univ Fed Bahia, Inst Quim, INCT Energia & Ambiente, Campus Univ Ondina, BR-40170115 Salvador, BA, Brazil

[4] Univ Fed Bahia, Inst Geociencias, Nucleo Estudos Ambientais, Campus Univ Ondina, BR-40170115 Salvador, BA, Brazil

关键词: EDXRF;    Metals determination;    Agave;    Sisalana;    Sisal fiber;    Solid phase extraction;    Diesel oil;   

DOI  :  10.1016/j.talanta.2020.121910

来源: Elsevier

【 摘 要 】

As a natural adsorbent, sisal (agave sisalana) fibers were used to extract Cu, Ni, Mn, and Zn from diesel oil samples for posterior determination (i.e., direct analytical measurements on the solid support) of the analytes by energy dispersive X-ray fluorescence spectrometry (EDXRF). In the proposed procedure, 0.2 g of sisal fiber was directly added to 5.0 mL of diesel oil contained in a glass tube. After 5 min of contact time, the mixture was filtered, and the collected fibers were oven-dried for 30 min at 70 degrees C. After drying, the analytes were quantified directly by EDXRF using the sisal fibers as a solid support. The calibration curves showed linear concentration ranges of 0.09-1.00, 0.12-1.00, 0.09-1.00, 0.06-1.0 mu g g(-1) for Cu, Ni, Mn, and Zn, respectively. The limits of detection (LOD) for Cu, Ni, Mn, and Zn were 0.03, 0.04, 0.03, and 0.02 mu g g(-1), respectively. The repeatability, evaluated by performing ten measurements at a concentration of 0.50 mu g g(-1) for each metal, with the results expressed in terms of the relative standard deviation (RSD), was 3.2, 6.5, 6.8, and 6.1% for Cu, Ni, Mn, and Zn, respectively. The results obtained by the proposed method were compared with the results obtained by a comparative method using inductively coupled plasma optical emission spectrometry, and both results showed good agreement. The proposed method was applied for Ni, Cu, Mn, and Zn determination in diesel oil samples collected from different gas stations.

【 授权许可】

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