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A rapid and sensitive voltammetric determination of sulphur in biodiesel in samples no treated and treated with TMAH

机译：快速灵敏的伏安法测定未经TMAH处理和处理的样品中生物柴油中的硫

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摘要

The control of environmental pollution has demanded increasingly determination of sulphur in a variety of matrices. Different analytical methods have been developed for the determination of this analyte in biodiesel fuel using various analytical techniques, including spectroanalytic and chromatographic methods. In this work a square-wave cathodic adsorptive stripping voltammetric (SW-AdCSV) procedure is proposed for the determination of sulphur in biodiesel, using a glassy carbon electrode modified with mercury-film (MFE). A buffer solution containing sodium acetate 1.4 mol L-1 and acetic acid 2% was used as supporting electrolyte in two different media (methanol an propanol). The voltammetric measurements were performed adding 70 mu L of biodiesel sample previously treated with tetramethylammonium hydroxide (TMAH) to the supporting electrolyte. The method showed good linearity (r = 0.998) in the determination of sulphur in biodiesel (medium-concentration of 2.68 x 10(-8) mol L-1 (1.07 x 10(-3) mg kg(-1)) for a confidential level of 95%. Low values of limit of detection-LOD (3.29 x 10 (-10) mol L-1 (1.32 x 10(-5) mg kg(-1)) and limit of quantification-LOQ (1.10x10(- 9) mol L-1 (4.40 x 10(-5) mg kg(-1)) indicate a good sensitivity of the method. A validation of the procedure was carried out by comparing this procedure with the results obtained by an official method, using the same sample, through Teste-t of Student (confidence level of 95%). These results indicated that both methods are statistically equivalent, thus demonstrating the feasibility of the new method. (C) 2017 Elsevier Ltd. All rights reserved.
机译：控制环境污染已要求越来越多地测定各种基质中的硫。已经开发出了各种分析方法，用于使用各种分析技术（包括光谱分析和色谱方法）测定生物柴油燃料中的这种分析物。在这项工作中，提出了一种方波阴极吸附溶出伏安法（SW-AdCSV）程序，该程序使用汞膜修饰的玻璃碳电极（MFE）测定生物柴油中的硫。在两种不同的介质（甲醇和丙醇）中，将含有1.4 mol L-1乙酸钠和2％乙酸的缓冲溶液用作支持电解质。进行伏安法测量，将70 µL事先用四甲基氢氧化铵（TMAH）处理过的生物柴油样品添加到支持电解质中。该方法在生物柴油中硫的测定中表现出良好的线性（r = 0.998）（介质浓度为2.68 x 10（-8）mol L-1（1.07 x 10（-3）mg kg（-1）））机密水平为95％。检测限低（3.29 x 10（-10）mol L-1（1.32 x 10（-5）mg kg（-1））和定量限（1.10x10） （-9）mol L-1（4.40 x 10（-5）mg kg（-1））表明该方法具有良好的敏感性，通过将该程序与官方提供的结果进行比较，对该程序进行了验证（S）2017 Elsevier Ltd.版权所有（C）2017年爱思唯尔有限公司（Elsevier Ltd.） 。

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  • 来源
    《Fuel》 |2017年第15期|464-469|共6页
  • 作者

    Viegas H. D. C.; Almeida J. M. S.; Lacerda C. A.; Silva J. B.; Marques A. L. B.; Marques E. P.;

  • 作者单位

    Univ Fed Maranhao, Dept Chem LPQA NEPE, Sao Luis, MA, Brazil;

    Univ Fed Maranhao, Dept Chem LPQA NEPE, Sao Luis, MA, Brazil;

    Univ Fed Maranhao, Dept Chem LPQA NEPE, Sao Luis, MA, Brazil;

    Fed Inst Piaui IFPI, Parnaiba Campus, Teresina, PI, Brazil;

    Univ Fed Maranhao, Dept Chem Technol LAPQAP NEPE, Sao Luis, MA, Brazil;

    Univ Fed Maranhao, Dept Chem LPQA NEPE, Sao Luis, MA, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SW-AdCSV; Glassy carbon; Mercury-film; TMAH; Biodiesel;

    机译：SW-AdCSV;玻璃碳;汞薄膜;TMAH;生物柴油;

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