A survey of pesticide residues in 20 samples of health tea and 13 samples of herbal tea shown in table 1 was done. Ninety-seven kinds of pesticides, that is, 13 kinds of organochlorine, 12 kinds of pyrethroid, 31 kinds of organophosphorus, 13 kinds of carbamate (containing matabolites), 25 kinds of the other organonitrogen and 3 kinds of the other pesticides were surveyed (table 2). The results were shown as follows. 1) Thirteen kinds of insecticides, that is, β-BHC, δ-BHC, op'-DDT, pp'-DDT and pp'-DDE of organochlorine, DDVP, malathion, MEP, EPN and chlorpyriphos of organophosphorus, MIPC of carbamate, diflubenzuron and pyridaben of the other organonitrogen pesticides were detected in 15 out of the 33 samples of herbal tea and health tea (table 4). 2) Pesticide except for organochlorine was not detected in tea of flower and roast tea. Organochlorine pesticides was scarcely detected in roast tea (table 3). Chlorpyriphos, MEP and EPN of organophosphorus, diflubenzuron of the other organonitrogen pesticides were detected at high levels (table 4). 3) op'-DDT in addition to pp'-DDE of highly residual pesticides were detected in high frequency. And organochlorine pesticides were detected in all of health tea and herbal tea cultivated in China (table 4, fig.1). 4) Comparing with the criteria of pesticide residues for 'tea' based on the Food Sanitation Law, DDT, MEP, EPN and chlorpyriphos were detected at exceeded levels. Therefore, inspecting levels of these pesticides by extraction method with boiling water based on that law, detection levels of all pesticides were less than that criteria. However, MEP was detected at rather high levels of 50 % of the criterion. From the above-mentioned results, it will be necessary to make a more detailed survey of pesticide residues in health tea and herbal tea.
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