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The Accumulation and Distribution of Heavy Metals in Teas on Both Sides of Highway

WU Yong gang,JIANG Zhi lin,LUO Qiang(College of Forest Resources and Environment Nanjing Forestry University,Nanjing 210037,China)  
The heavy metals concentration and distribution in different organs of tea and in soil on the both sides of National Highway 312 are studied.The results show that Pb,Cd,Cr,Cu,Mn,Ni,Zn concentrations are significantly different in different organs of tea.The ranges of them respectively are 1.2~9.4 ,0.06~0.36,0.84~0.9,3.6~12.6,66~461,3.7~7.6,18.2~35.9 mg/kg.The concentrations of Pb,Cd,Zn are higher in tender branches.While the accumulation of Cu,Mn,Ni is higher in tea leave.Tea has the significant function of accumulating Cd.The concentration order of 7 heavy metals in tender leaves is CuZnMnCdNiPbCr.Pb pollution from tail gases emitted by automobiles diffuses mainly within 60 m apart from the highway.Because tea is manufactured from tender leaves,the standard to decide whether it is suitable to plant tea trees in both sides of highways is the comparison between the Pb content in tender leaves and the National Health Standard.The study shows that the Pb content in tender leaves exceeds the National Health Standard when the distance of tea plantation from highways is less than 60 meters.So without protective measures,it is not suitable to plant tea plantation within above mentioned distance.
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