痕量亚硝酸根的测定及其反应动力学研究

doi:10.3964/j.issn.1000-0593(2014)06-1619-05

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Abstract A catalytic kinetic spectrophotometric method for the determination of nitrite, NO₂^--S₂O^2-₈-MR, was developed. It is based on the fading reaction of methyl red (MR) oxidized by potassium persulfate which can be catalyzed by NO^-₂ in the medium of dilute HCl. The optimum experimental conditions were gained by combining single factor experiments with orthogonal experiments. Calibration curve, detection limit, precision, and anti-interference under the optimum experimental conditions were researched. Its kinetics principles and parameters were discussed. Its quantitative principle was investigated. The results show that the optimum experimental conditions of this method should be as follows: 1.0 mL 0.3 mol·L^-1 HCl，1.0 mL 0.01 mol·L^-1 K₂S₂O₈，0.6 mL 0.2 g·L^-1 MR，reaction temperature 80 ℃ and reaction time 9 min. The principles for the quantitative determination of trace nitrite is that variation of MR concentration at the maximum absorption wavelength of 518 nm, ln(A₀/A), shows a good linear relationship with the concentration of NO^-₂ under the optimum experimental conditions. Its determination range is 0.01～0.80 mg·L^-1 and its detection limit is 0.007 mg·L^-1. The kinetic characteristics are that the reaction order in NO^-₂ is 1 and the fading reaction is a pseudo first order reaction. Its apparent activation energy is 85.04 kJ·mol^-1. Its apparent rate constant is 0.021 4 min^-1, and the half-life is 32.39 min at 80 ℃. The kinetic principle is that the variation of MR concentration is directly proportional to the concentration of NO^-₂, ln(A₀/A)=kｃ_NO^-₂. This new method for the determination of trace nitrite has never previously been reported in the published literature so far. It is highly sensitive and selective. Most of the common ions don’t interfere with the determination of nitrite. This method has the advantages of convenient operation and the regents used are cheap and nontoxic. It was applied to the determination of trace nitrite in food and water samples with satisfactory results.

Key words：Nitrite;A catalytic kinetic spectrophotometric method;Trace determination;Chemical reaction kinetics

Received: 2013-10-17 Accepted: 2014-02-04

ZTFLH:

O657.3

Corresponding Authors: LUO Zhi-yong E-mail: luozy@cqu.edu.cn

Cite this article:

LUO Zhi-yong,ZHENG Huai-li. Determination of Trace Amounts of Nitrite and Its Chemical Reaction Kinetics[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(06): 1619-1623.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2014)06-1619-05 OR https://www.gpxygpfx.com/EN/Y2014/V34/I06/1619

[1] Sonia Senra-Ferreiro, Francisco Pena-Pereira, Isela Lavilla, et al. Analytica Chimica Acta, 2010, 668(2): 195.
[2] Hayati Filik, Derya Giray, Burak Ceylan, et al. Talanta, 2011, 85(4): 1818.
[3] GB2760—2011. Standards for Uses of Food Additives(食品添加剂使用标准). National Standards of the People’s Republic of China(中华人民共和国国家标准).
[4] Ministry of Environmental Protect of P. R. C.(国家环境保护总局). Standard Methods for Monitoring and Analysis of Water and Waste Water(水和废水监测分析方法). 4th ed.(第四版). Beijing: China Environmental Science Press(北京: 中国环境科学出版社), 2002.
[5] ZHENG Huai-li, YAO Bing-hua, YAO Jia-fei, et al(郑怀礼, 姚秉华, 姚加飞, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2005, 25(8): 1312.
[6] Zou Mingqing, Zhai Qingzhou. Journal of Analytical Chemistry, 2010, 65(6): 602.
[7] Ali Sheibani, Reza Shishehbore M, Zahra Towakdian Ardakani. Chinese Chemical Letters, 2011, 22(5): 595.
[8] Reza Shishehbore M, Ali Sheibani, Ehsan Mirparizi. Chinese Chemical Letters, 2012, 23(5): 611.
[9] WANG Shu-min, FAN Xue-mei, ZHANG Xiao-jing, et al(王书民, 樊雪梅, 张晓晶, 等). Metallurgical Analysis(冶金分析), 2013, 33(6): 42.
[10] Ramazan Giirkan, Halil Ibrahim Ulusoy, Mehmet Akcay. Eurasian J. Anal. Chem. 2010, 5(1): 16.
[11] Ali A Ensafi, Amini M. Sensors and Actuators B: Chemical, 2010, 147(1): 61.
[12] Zenovia Moldovan. Rev. Roum. Chim.，2011, 56(1): 39.
[13] Seema Singh, Jeena Harjit, Kataria H C, et al. Journal of Chemical and Pharmaceutical Research, 2012, 4(7): 3695.
[14] Zenovia Moldovan. Bull. Chem. Soc. Ethiop.，2012, 26(2): 159.
[15] LUO Zhi-yong, ZHANG Sheng-tao, ZHAO Hui-ming(罗志勇, 张胜涛, 赵会明). Physical Testing and Chemical Analysis, Part B: Chemical Analysis(理化检验·化学分册), 2005, 41(10): 788.
[16] PENG Shao-wei(彭少伟). Chinese Journal of Spectroscopy Laboratory(光谱实验室), 2007, 24(3): 303.
[17] GB5009.33—2010. Determination of Nitrite and Nitrate in Foods(食品中亚硝酸盐与硝酸盐的测定). National Standards of the People’s Republic of China(中华人民共和国国家标准).