Detection of Sulfur Dioxide in Preserved Fruits with High Resolution Continuum Source Atomic Absorption Spectrometry Assisted with Distillation
ZU Wen-chuan1, 2, WANG Yu2*, ZHANG Yu-xiang2, LI Bing-ning2, LIU Cong2, REN Min2
1. Beijing Institute of Technology, College of Chemistry, Beijing 100081, China 2. Beijing Center for Physical & Chemical Analysis, Beijing 100089, China
Abstract：The CS diatomic molecules can be transformed from sulfur in fuel-rich air acetylene flame. The absorbance of CS can be detected with atomic absorption spectrometry as the CS line profile is similar to the atomic absorption. A novel method was established to detect the sulfur dioxide in preserved fruits with high resolution continuum source atomic absorption spectrometry. The sulfate ions can be transformed from the SO2 in preserved fruits after the experience of acidity, distillation and oxidation with H2O2.The instrumental parameters influencing on the sensitivity of SO2 determination were optimized, including the velocity of acetylene, the flame height, etc. And the interference of different S species, such as SO2-4, S2O2-3, etc on the SO2 recovery was observed. In the optimal conditions, the limit of detection under the wavelength of 257.961 nm was 52.4 mg·kg-1, and the relative standard deviation was below 10%. The average spiked recoveries between 85.7% and 115.7% were achieved when this method was used for real preserved fruits samples analysis. It’s proved that this method has the merits of high accuracy rapid analysis and low interference, and the application areas of atomic absorption spectrometry were extended.
[1] YIN Jie, ZHU Jun-li, LI Jian-rong(尹 洁，朱军莉，励建荣). Food Science and Technology(食品科技)，2009，34(11)：292. [2] WANG Li-li, JI Shu-juan, LI Shun(王丽丽，纪淑娟，李 顺). Food and Drug(食品与药品)，2007, 9(2)：64. [3] GB2760—2011. National Food Safety Standard for Use of Food Additives(食品安全国家标准 食品添加剂使用标准), 2011. [4] GB/T 5009.34—2003. The Determination of Sulfite in Food(食品中亚硫酸盐的测定), 2003. [5] CHEN Xiu-jie, TAN Qian, YU Tao(陈秀杰，谭 倩，余 涛). Chinese Journal of Health Laboratory Technology(中国卫生检验杂志)，2014, 24(1)：38. [6] LUO Li-li, WNAG Hai-bo, LIU Han-xia, et al(雒丽丽，王海波，刘汉霞, 等). Food Science and Technology(食品科技)，2011, 36(8)：397. [7] LI Liang, WANG Qing(李 良，王 晴). Science and Technology of Food Industry(食品工业科技)，2012, 33(17): 330. [8] CAI Gang, XING Hai-long, LIN Yong-tong(蔡 刚，邢海龙，林永通). Chinese Journal of Health Laboratory Technology(中国卫生检验杂志)，2012，24(4)：338. [9] Huang M D, Helmut Becker-Ross, Stefan Florek, et al. Spectrochimica Acta Part B, 2006，(61)：181. [10] Huang M D, Helmut Becker-Ross, Stefan Florek, et al. Anal. Bioanal. Chem.，2005，382: 1877.
