Determination of Nitrate and Nitrite in Tea by Ion Chromatography

CAI Hui-mei; HOU Ru-yan; GAO Zhu; PENG Chuan-yi; WAN Xiao-chun

doi:10.13305/j.cnki.jts.2012.02.002

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Journal of Tea Science ›› 2012, Vol. 32 ›› Issue (2) : 95-99. DOI: 10.13305/j.cnki.jts.2012.02.002

Determination of Nitrate and Nitrite in Tea by Ion Chromatography

CAI Hui-mei¹, HOU Ru-yan¹, GAO Zhu², PENG Chuan-yi¹, WAN Xiao-chun^1*

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Abstract

A method for simultaneous determination of nitrite and nitrate in tea was established. Tea samples were pre-treated by ultrasonic extraction, PVPP and solid-phase extraction cartridge clean up, and the resulting supernatants were injected into a high-capacity anion exchange column with suppressed conductivity detection. The results showed that the recovery nitrate was 88.6%~107.5% and nitrite was 89.3%~101.2%. The relative standard deviations (RSD) were 1.67% and 1.13% respectively. It was concluded that the advantages of the method are simple operation, fast and high accuracy.

Key words

ion chromatography / nitrate / nitrite / tea

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CAI Hui-mei, HOU Ru-yan, GAO Zhu, PENG Chuan-yi, WAN Xiao-chun. Determination of Nitrate and Nitrite in Tea by Ion Chromatography[J]. Journal of Tea Science. 2012, 32(2): 95-99 https://doi.org/10.13305/j.cnki.jts.2012.02.002

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