闽中某矿区县茶园土壤和茶叶重金属含量及健康风险

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Abstract To investigate the concentrations and health risk assessments of heavy metals in tea garden soils and tea-leaf,25topsoil (0~20cm) and 23 commercial tea samples were collected from a mine county in central Fujian province.The concentrations of 8heavy metals (Cr,Ni,Cu,Zn,As,Pb,Cd and Co) in topsoil were analyzed,and the potential ecological risk degree of heavy metals were comprehensively evaluated with the methods of geoaccumulation index (I_geo) and potential ecological risk idex (RI).The preliminary health risk assessments of these eight heavy metals in the commercial tea were evaluated with the USEPA health risk assessment model.The results showed that:(1) the average contents of Cr,Ni,Cu,Zn,As,Pb,Cd and Co were 110,23.5,23.0,107,50.7,78.0,0.23 and 14.3mg/kg in the topsoil,respectively,which were all higher than the background value in the soil in Fujian.(2) The order of I_geo was As > Cd > Cr > Pb > Zn > Co > Ni > Cu,with heavy pollution for As,medium pollution for Cd and Cr and low comtaminated risk for the other metals,respectively.(3) The order of potential risk for each element was Cd > As > Pb > Co > Ni > Cr > Cu > Zn,with Cd of higher and As of high ecological risk,and with slight ecological risk for the other heavy metals The average RI of 255.74 was a higher level,which was mainly attributed to Cd and As.(4) The contents of Cr and Cd of commercial tea samples were within the limits of corresponding quality standard,and Cu,As and Pb-abnormal only occurs in few commercial tea samples,indicating that the overall level of heavy metal in commercial tea were security level.(5) Health risk assessment results of commercial tea indicated that heavy metals of personal total annual risk was 1.01×10^-4 to 9.07×10^-5.The personal total annual risk of oolong tea was slightly higher while black and green tea were lower than the maximum acceptable levels recommended by US EPA (1.0×10^-4).The contribution rate of 90.38% for Cr was the highest health risk factor for all the 8dectected heavy metals,with the other metals within the security range.

Key words： diggings area tea garden soil tea heavy metal ecological risk assessment health risk assessment

Received: 10 August 2017

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	WANG Feng
	SHANG Rui-yang
	CHEN Yu-zhen
	LIN Dong-lian
	ZANG Chun-rong
	CHEN Chang-song
	YOU Zhi-ming
	YU Wen-quan

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WANG Feng,SHANG Rui-yang,CHEN Yu-zhen等. Concentrations and health risk assessment of heavy metals in tea garden soil and tea-leaf from a mine county in central Fujian province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 1064-1072.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/1064

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