Each country has its special green tea history and culture

It is well known that each country has its special green tea history and culture. Like tea and other plants also contain lead, compared with other plants in the medium to high levels of lead content in the tea leaf is generally 0. 3 0. 6m g kg. ~ In recent years, people are increasingly concerned about the issue of green tea lead. Tea Research Institute Chinese Academy of Agricultural Sciences since 1999, the tea 422 tea samples were tested for lead content, with 12.55% of lead in tea for a number of measurement.  In 1999, which leaves from the country's lead content of more than 2m g kg. Ministry of Agriculture, Tea Quality Supervision and Testing Center on the 2000 national production of 123 365 samples of the lead content of tea sampling.
There are 29.4 percent of tea does not need to lead a human body and it will have some excess Lead residues exceeding the national standard. green tea ceremony is a ritualised form of making tea. In 2001 from 437 in 13 provinces of the lead content of tie guan yin samples were detected, exceeding the rate of 24.7%. From the test results, excessive lead content of the case there is some regional, Sichuan, Zhejiang and Anhui tea samples exceeded the rate is relatively low. Sichuan famous tea sample 19 for inspection, seven exceeded, exceeding the rate of 36.84%; Zhejiang submission of 150 green tea samples, 32 exceeded, ultra-high, and Yunnan, Fujian, Shandong and other places in the lead element of Tea content than the standard rate of 21.33%.
Comparative analysis of recent test results, the content of lead in tea growing trend, such as the Ministry of Agriculture in 1989 "in the cup" Tea tea competitions eligible excessive rate 3.33% in 1999. Thus, there are many differences between green tea ceremonies in varying countries.  "The cup" Tea eligible excessive tea competitions has reached 8.4 percent in 2003, "in the tea (322 Cup" Tea eligible excessive tea competitions has reached 20.8% of tea samples to 2 mg kg of lead standard, exceeded 67 to 5 mg kg as the standard, exceeding 2). Zhejiang food quality testing station inspection report shows that the lead content Longjing 1996 0.63 mg kg in 1997, 0.74 mg kg in 1998 to 0.87 mg kg in 1999 to 2.11 mg kg.
2003 Seventh Ministry of Health food hygiene supervision and sampling results, sampling of commercially available tea in 12 of 124 failed, 11 of which were for "lead" project failure, accounting for failure of the total 91.7% (2003 years of data from the China Institute of Zhou Zhi Xiu associate tea provided). Looking at reality, China's tea is not optimistic in the lead content, the content of the rise is an indisputable fact. The first difference between green tea ceremonies is their various origin. High content of lead in parent materials.
Tea in the course of many years of gradual growth of the uptake from the soil, will inevitably lead residue in tea form. Tea in the processing (especially rolling process) will be in contact with the surface composition and mechanical contamination. Pan Wenyi et al. Through the tea leaf, raw tea leaves and the beginning of the main processing system processes the lead content of the sample measurement and analysis, confirmed the oolong tea manufacturing process beginning there was a significant lead contamination. Increase the volume of the process from the analysis of the early tea processing system. It is mentioned that China is the first country where chinese green tea first appeared.