title: [Survey of pesticide residues in imported tea (1992.4-2010.3)].
abstract: A survey of pesticide residues in 116 imported tea samples on the Tokyo market from April 1992 to March 2010 was carried out. Twenty-two kinds of pesticides, including organophosphorus, organochlorine, pyrethroid and others, were detected at levels between trace (below 0.01 ppm) and 4.0 ppm in 76 samples. The rate of detection was 90% in non-fermented tea, 89% in semi-fermented tea, and 49% in fermented tea. Organophosphorus pesticide was not detected in puer tea, which is fermented with bacteria. The pesticide residues tended to be decreased by a fermentation process. However, organochlorine and pyrethroid pesticides appeared to be chemically stable, so they were still detected in fermented teas. Residue levels of these pesticides were calculated as less than 1% of ADI, except for ethion (45% of ADI) based on the daily intake of tea. Therefore, these teas should be safe when drunk in customary amounts.
authors.affiliation: Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunin-cho, Shinjuku-ku, Tokyo 169-0073, Japan. Maki_Kobayashi@member.metro.tokyo.jp
authors.forename: Maki
authors.initials: M
authors.lastname: Kobayash
authors.forename: Kenji
authors.initials: K
authors.lastname: Ohtsuka
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tamura
authors.forename: Sanae
authors.initials: S
authors.lastname: Tomizawa
authors.forename: Teruaki
authors.initials: T
authors.lastname: Kinoshita
authors.forename: Kyoko
authors.initials: K
authors.lastname: Kamijo
authors.forename: Keiko
authors.initials: K
authors.lastname: Iwakoshi
authors.forename: Chizuko
authors.initials: C
authors.lastname: Sato
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nagayama
authors.forename: Ichiro
authors.initials: I
authors.lastname: Takano
mesh_terms: D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis; D008452:Maximum Allowable Concentration; D009943:Organophosphorus Compounds / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis; D013662:Tea / Q000737:chemistry*; D014041:Tokyo
chemical_list: D006843:Hydrocarbons, Chlorinated; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D011722:Pyrethrins; D013662:Tea