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Flow injection analysis of free glycerol in biodiesel using a copper electrode as an amperometric detector

机译:使用铜电极作为安培检测器的流动注射分析生物柴油中的游离甘油

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摘要

The main goal of this work was to develop a simple analytical method for quantification of glycerol based on the electrocatalytic oxidation of glycerol on the copper surface adapted in a flow injection system. Under optimal experimental conditions, the peak current response increases linearly with glycerol con centration over the range 60-3200 mg kg"1 (equivalent to 3-160 mg L-1 in solution). The repeatability of the electrode response in the flow injection analysis (F1A) configuration was evaluated as 5% (n = 10), and the detection limit of the method was estimated to be 5 mg kg"1 in biodiesel (equivalent to 250 ug L-1 in solution) {S/N = 3). The sample throughput under optimised conditions was estimated to be 90 h-1. Dif ferent types of biodiesel samples (B100), as in the types of vegetable oils or animal fats used to produce the fuels, were analysed (seven samples). The only sample pre-treatment used was an extraction of glyc erol from the biodiesel sample containing a ratio of 5 mL of water to 250 mg of biodiesel. The proposed method improves the analytical parameters obtained by other electroanalytical methods for quantifica tion of glycerol in biodiesel samples, and its accuracy was evaluated using a spike-and-recovery assay, where all the biodiesel samples used obtained admissible values according to the Association of Official Analytical Chemists.
机译:这项工作的主要目的是开发一种简单的分析方法,用于基于流动注射系统中铜表面上甘油的电催化氧化,对甘油进行定量。在最佳实验条件下,峰值电流响应在60-3200 mg kg“ 1(相当于溶液中的3-160 mg L-1)范围内随甘油浓度线性增加。电极响应在流动注射分析中的可重复性(F1A)构型评估为5%(n = 10),该方法的检出限估计为5 mg kg“ 1(在生物柴油中)(相当于溶液中250 ug L-1)(S / N = 3 )。在优化条件下的样品通量估计为90 h-1。分析了不同类型的生物柴油样品(B100),如用于生产燃料的植物油或动物脂肪的类型(七个样品)。唯一使用的样品预处理是从生物柴油样品中提取甘油,其中甘油与水的比例为5 mL / 250 mg。所提出的方法改善了通过其他电分析方法获得的用于定量测定生物柴油样品中甘油的分析参数,并使用加标回收法对准确性进行了评估,其中所有使用的生物柴油样品均根据官方协会的规定获得允许值。分析化学家。

著录项

  • 来源
    《Fuel》 |2012年第1期|p.187-191|共5页
  • 作者单位

    Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, 09210-170 Santo Andre, SP, Brazil;

    Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, 09210-170 Santo Andre, SP, Brazil,Instituto de Quimica, Universidade de Sao Paulo, 05508-900 Sao Paulo, SP, 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

    biodiesel; glycerol; amperometric detector; duality control; vegetable oil;

    机译:生物柴油;甘油;安培检测器;对偶控制;植物油;

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