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.
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
.
DOI: 10.13305/j.cnki.jts.2012.02.002
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