Spectroscopic Determination of Trace Nitrite in Water and Meat Following Solid Phase Extraction

被引：0
|
作者：
Li C. [1 ]
Li L. [1 ]
Zhu Y. [1 ]
Wu T. [1 ]
Du Y. [1 ]
机构：
[1] Shanghai Key Laboratory of Function Materials Chemistry, East China University of Science and Technology, Shanghai
来源：
Shipin Kexue/Food Science | 2021年 / 42卷 / 12期
关键词：
NaNO[!sub]2[!/sub; Rapid determination; Solid phase extraction; Solid phase extraction combined with spectroscopy; Ultraviolet-visible diffuse reflectance spectroscopy;
D O I：
10.7506/spkx1002-6630-20191104-043
中图分类号：
学科分类号：
摘要：
A spectroscopic method was used for the quantitative analysis of sodium nitrite after solid phase extraction. The analytical wavelength was set at 472.5 nm, and the derivatization conditions were optimized as follows: pH 4.74, derivatization time 15 min, and derivatization reagent composition sodium nitrite:p-aminobenzenesulfonic acid:1-naphthol molar ratio of 1:3:3.Enrichment was accomplished using a nylon membrane with a loading volume of 10 mL.In the concentration range of 0.002-0.030 mg/L, the absorbance (y) had a quadratic relationship with nitrite concentration (x), expressed as y = -268.76x2 + 14.55x + 0.03, with a correlation coefficient (R2) of 0.999, and the limit of detection (LOD) of the presented method was 1.29 μg/L. The method was applied to the detection of NaNO2 in tap water with spiked recoveries of 91.3%-114.0%, and relative standard deviations (RSDs) of 4.21%-7.90%.The results of this method for sodium nitrite in bacon agreed with those of ion chromatography, with standard deviations of 8.51% and 9.98% in parallel experiments on American-style and Shuanghui-branded bacons, respectively. This study has provided a rapid, sensitive, accurate and precise method for the determination of NaNO2 with high selectivity. © 2021, China Food Publishing Company. All right reserved.
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页码：309 / 314
页数：5
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