Application of on-line dialysis in the determination of nitrite and nitrate in vegetables by ion chromatography
文献类型: 外文期刊
第一作者: Xu Xia
作者: Xu Xia;Ying Xing-Hua;Duan Bin-Wu;Chen Neng
作者机构:
关键词: dialysis;ion chromatography;vegetables;nitrite;nitrate
期刊名称:CHINESE JOURNAL OF ANALYTICAL CHEMISTRY ( 影响因子:1.134; 五年影响因子:0.909 )
ISSN: 0253-3820
年卷期: 2007 年 35 卷 11 期
页码:
收录情况: SCI
摘要: An on-line dialysis coupling with ion chromatographic method for the simultaneous determination of nitrite and nitrate in vegetables using suppressed conductivity detection was reported. The nitrite and nitrate were extracted from the vegetable by mixing and diluting the samples with boiled water. The water-soluble giant molecule, impurity and pigment etc. were removed by on-line dialysis with dialysis cellulose acetate membrane of pore size 0. 20 mu m. A standard or sample containing the anions was separated on an anion-exchange column (250 mm x 4 mm) with 1.8 mmol/L Na2CO3 + 1.7 mmol/L NaHCO3 as eluent and was detected by suppressed conductivity detector. Parameters such as linearity, limit of detection, precision and accuracy of the method were investigated. The relative standard deviation for the proposed method was lower than 10% and considering a sample of 20. 0 g ( n = 6), the detection limit of the method was 0. 075 mg/kg and 0. 105 rng/kg of nitrite and nitrate, respectively. The recoveries of nitrite and nitrate in vegetable matrices were 80. 6% - 98. 7% and 90. 5% - 114%, respectively. The proposed method was compared with a reference method official AOAC reference method for the determination of nitrite and nitrate in foodstuffs). These results demonstrated that the proposed method is simple, sensitive and reliable for the determination of nitrite and nitrate in vegetables, despite the presence of the particularly complex matrix.
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