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Differences in of West Lake green tea ceremony in various countries is vast.Tea is a long history, nutrient-rich natural health beverage, has become second only to carbonated beverages and drinking water of the world's third largest beverage, beverage experts predict will be the 21st century era of tea. As people's living standards improve, people's increasing demand for health tea, tea in the emphasis on the human body can produce quick indicators of pesticide hazards, based on the human body has begun to focus on the late effects of hazardous heavy metals content of indicators, particular elements of lead content.  This paper, the current lead in the tea for a discussion of relevant issues. 1 tea harmful lead levels and trends of heavy metals.
Part of the tea garden soil background value of lead content is high, and because of the role plants have accumulated, so that excessive intake of tea in the growth of lead, resulting in excessive levels of lead. Some people in the city traffic and traffic-intensive areas, soil heavy metal pollution is very prominent. Nanjing, an auto repair shop in the soil surface to detect lead-up to race 900m g kg. Soil organic tie guan yin garden in China's current quality standard values of lead and AA grade green food value of the soil environmental quality standards in the lead were <60m g kg, Germany, a lead in the soil to allow a maximum of 100m g kg. After the popular Japanese Sada emerged, West Lake green tea ceremony was transmitted to Japan.
Thus, lead in tea is not for normal health threat, tea as a beverage is safe and healthy. Therefore, we should vigorously promote and improve public awareness of environmental protection. And gasoline in the car to promote the use of unleaded gasoline. Shelterbelts can reduce wind speed and hinder the spread of pollutants, the proposed establishment of shelterbelts surrounding the tea in order to reduce automobile exhaust pollution. Lead contamination in soil is difficult to purify, has contaminated soil should not operate on tea. And let the tea as much as possible away from the lead-polluted areas. Another tea may lead contamination from pesticides,. The second diversity lies in the varieties of West Lake green tea.
Copper content in tea testing methods are flame atomic absorption spectrometry and sodium diethyl dithiocarbamate method. I flame atomic absorption spectrometry in samples of soil and tea lead and copper content. 1 Materials and methods 1.1 collection, transport and use. Copper deficiency will lead to "low blood copper syndrome", a series of iron metabolism changes. However, excessive intake of copper may harm human health. Copper can result in substantial accumulation of human liver. Have called "liver pox" diseases of copper metabolism. UN Food and Agriculture (FAO) and World Health Organization (wHO) to determine the weight of 60 kg person on the maximum allowable daily intake of 30mg.  As of July, 2000, some importing countries who are members of EU proposed a number of stricter detection criteria on pesticide residues of West Lake green tea products.
Tea gardens, were labeled L0, H1, H2, H3, S1, g of lead nitrate, dissolved in 2% nitric acid and dilute to 1 L, shake, S2, s3, J1, J2, J3. March-April 2007, in accordance with each tea in a random, equal mixture of principle and multi-point, using the S-distribution method, collecting the vertical depth of O-20 cm of the soil in plastic bags, each tea soil samples taken 10 to 20, mixing, quartering take about 1 kg. Seal and label, back to the laboratory [41. 1.2.2 Collection of samples of tea which has a lead concentration of lL. Lead Standard Solution A: accurate drawing lO rIll lead standard stock solution at 100 frIl flask, add nitric acid (1 +1) 20 rnl, with 2% nitric acid to the mark, shake, the solution concentration of lead is 100 m grumble.West Lake chinese green tea ceremony is a kind of art.