Analysis of Trace Metals and Perfluorinated Compounds in 43 Representative Tea Products from South China

Six trace metals (Cd, Pb, Cr, Cu, Zn, and Mn) and 2 perfluorinated compounds (PFCs), perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), were analyzed in 43 representative tea products (including 18 green, 12 Oolong, and 13 black teas) from 7 main tea production provinces in China, u...

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Bibliographic Details
Published in:Journal of food science 2014-06, Vol.79 (6), p.C1123-C1129
Main Authors: Zheng, Hai, Li, Jian‐Long, Li, Hai‐Hang, Hu, Guo‐Cheng, Li, Hua‐Shou
Format: Article
Language:English
Subjects:
Alkanesulfonic Acids - analysis
atomic absorption spectrometry
Black tea
Cadmium
Camellia sinensis
Caprylates - analysis
China
Chromatography, High Pressure Liquid
Chromium
copper
Fluorocarbons - analysis
Food Contamination - analysis
Food safety
green tea
heavy metals
Humans
lead
Lead (metal)
manganese
Metals, Heavy - analysis
perfluorocarbons
perfluorooctane sulfonate
perfluorooctanoic acid
principal component analysis
Principal components analysis
south China
Sulfonates
Tandem Mass Spectrometry
Tea
Tea - chemistry
Trace elements
Trace Elements - analysis
Trace metals
zinc
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Summary:Six trace metals (Cd, Pb, Cr, Cu, Zn, and Mn) and 2 perfluorinated compounds (PFCs), perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), were analyzed in 43 representative tea products (including 18 green, 12 Oolong, and 13 black teas) from 7 main tea production provinces in China, using the atomic absorption spectrophotometer for trace metals analysis and HPLC‐MS/MS for PFOS and PFOA analysis. The average contents of the 3 essential metals Mn, Cu, and Zn ions in the tea samples were 629.74, 17.75, and 37.38 mg/kg, whereas 3 toxic metals Cd, Cr, and Pb were 0.65, 1.02, and 1.92 mg/kg, respectively. The contents of heavy metals in the 3 types of tea were in the order of black tea > Oolong tea > green tea. Both PFOS and PFOA contents were low and PFOA content was higher than PFOS in the tea samples. The highest concentration of PFOA was 0.25 ng/g dry weight found in a Hunan green tea. The Principal component analysis was performed with the trace metals and PFCs to analyze the relationships of these indices. The results showed that black teas had higher trace metals and PFCs than green and Oolong teas, and the teas from Hunan and Zhejiang provinces had higher Pb and Cr than others.
ISSN:0022-1147
1750-3841
DOI:10.1111/1750-3841.12470