闽中某县茶园土壤-茶树-茶汤中镉含量及健康风险评价研究

doi:10.13305/j.cnki.jts.2018.05.011

Abstract

Abstract: Extensive soil and tea tree samples were collected from 8 tea gardens in central Fujian Province to assess the cadmium (Cd) distributions and explore the Cd transportation from tea garden soil, tea leaf to tea soups. Their relations with soil physical and chemical properties were also discussed, and the preliminary health risk assessments of the Cd in tea were conducted using the USEPA health risk assessment model. The results showed that the average total soil Cd content was 112.74βμg·kg^-1, which was 2.06 times higher than the background value in Fujian. The average available soil Cd content and available rate were 26.44βμg·kg^-1 and 24.86%. The total and available soil Cd contents had significant but negative correlations with soil organic matter and pH value, and the available soil Cd rate was positively and significantly correlated with total and available soil phosphorus. The Cd contents of the main and secondary roots had a positive and significant correlation with the total and available Cd as well as soil organic matter. The Cd content in new leaves had a positive and significant correlation with soil available Cd and total phosphorus. The Cd distribution in tea plant followed the order as: lateral roots (1β253.89βμg·kg^-1) > main roots (382.20βμg·kg^-1) > main stem (167.25βμg·kg^-1) ≈secondary stem (154.65βμg·kg^-1) >older leaves (30.60βμg·kg^-1) ≈ new leaves (27.13βμg·kg^-1). The enrichment coefficients in roots were significantly higher than other tissues, suggesting the preferential accumulation of Cd in tea roots. The average Cd content in tea soup was 192.28βng·L^-1, which was far below the sanitary standard for drinking water (GB 5749—2006). The dissolution ratio of Cd was 15.29%. Health risk assessment results of the tea soup and dry tea indicated that Cd of personal total annual risk of approximately 6.33×10^-7and 4.42×10^-6, which were one or two order of magnitude lower than the threshold recommended by ICRP (1.0×10^-5). Thus, these tea would be safe to drink.

Key words: tea garden soils, tea plants, cadmium, distribution characteristics, enrichment coefficient, health risk assessment

CLC Number:

WANG Feng, SHAN Ruiyang, CHEN Yuzhen, LIN Dongliang, ZANG Chunrong, CHEN Changsong, YOU Zhiming, YU Wenquan. A Case Study of Cadmium Distribution in Soil-Tea Plant-Tea Soup System in Central Fujian Province and Relative Health Risk Assessment[J]. Journal of Tea Science, 2018, 38(5): 537-546.

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A Case Study of Cadmium Distribution in Soil-Tea Plant-Tea Soup System in Central Fujian Province and Relative Health Risk Assessment

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