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《Journal of Agro-environmental Science》 2004-05
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Influence Factors on Lead Contents in Longjing Tea

SHI Yuan-zhi,HAN Wen-yan,MA Li-feng,RUAN Jian-yun(Key Lab.of Tea Chemical Engineering,Ministry of Agriculture,Tea Research Institute Chinese Academy of Agricultural Sciences,Hangzhou 310008,China)  
Employing pot trials and investigation, we found that available le a d contents in soil and total lead in tea shoots were increased significantly, wh en tea gardens were polluted by lead. The available lead could be one of main le ad sources of tea shoots. We also found that available lead contents in the soil with 0~40 cm had a significantly positive correlation with lead contents in t ea shoots (P 0.01), and a negative correlation with the soil pH value (P 0.05) , indicating it was possible to control the pollution of lead on tea, if the pH value was able to be adjusted. In addition, we also found that the lead contents in tea shoots increased when the shoots became older. For the tea gardens near roadside, atmospheric deposition may be another contribution of lead resource. H owever, we found that it's influence would be within 150 m along the load. Durin g the process of Longjing tea, we found that lead pollution may be from processi ng machine rather than the tea-making oil.
【Fund】: 杭州市科技计划项目
【CateGory Index】: X835
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