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On-line chemical vapor generation for determination of total sulfur dioxide in wine samples using an atomic fluorescence spectrometer

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Abstract

Sulfur dioxide (SO2) is used as a universal additive to wine due to its excellent antioxidative, antimicrobic, and anti-brown characteristics and also because it is the product of natural fermentation of grapes. The concentration of SO2 in wine is strictly regulated since SO2 at high concentrations can damage tissues, organs, and various systems of human beings. In this study, an atomic fluorescence spectrometer (AFS) was used for the determination of SO2 by measuring its molecular fluorescence signal excited by a zinc hollow cathode lamp (Zn HCL, 213.8 nm) under simple and mild conditions without igniting the atomizer. The instrumental settings were first optimized by detecting gaseous SO2 prepared in advance. Under the optimal conditions, the instrumental limit of detection (LOD) for SO2 was found to be 0.17 μg, and the relative standard deviation (RSD) of 200 μg SO2 was 1.3%. The method was developed for determining the total SO2 in wine samples extracted by sodium hydroxide and generated in the form using sulfuric acid. The LOD of 0.79 μg mL−1 for this method was achieved for the total SO2 analysis of wine samples with a 5.2% RSD at a concentration level of 30 μg mL−1. The advantages of this method are simplicity, high throughput, less interference, relatively low cost, and less chemical consumption.

Graphical abstract: On-line chemical vapor generation for determination of total sulfur dioxide in wine samples using an atomic fluorescence spectrometer

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Publication details

The article was received on 07 Oct 2017, accepted on 20 Nov 2017 and first published on 20 Nov 2017


Article type: Paper
DOI: 10.1039/C7JA00336F
Citation: J. Anal. At. Spectrom., 2018, Advance Article
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    On-line chemical vapor generation for determination of total sulfur dioxide in wine samples using an atomic fluorescence spectrometer

    H. Yu, C. Zheng, X. Jiang, X. Wu and X. Hou, J. Anal. At. Spectrom., 2018, Advance Article , DOI: 10.1039/C7JA00336F

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