title: Extraction of pesticide residues in tea by water during the infusion process.
abstract: The extraction rate of pesticide residues in water during the infusion process is dependent on the water solubility. The extraction of pesticide residues by boiling water can be regarded as a reversible equilibrium between adsorption and dissolution. The influence of chemical degradation is not important. When the water solubility is lower than 5 mg/kg, the extraction rate is 1-4%. Within the water solubility range of 10-150 mg/kg the extraction rate (Ri) is very sensitive to the water solubility (S); the relationship can be described as Ri = 59.8log S-42.5. When water solubility is higher than 170 mg/kg, the extraction rate is 90-100%.
authors.affiliation: Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou.
authors.forename: H
authors.initials: H
authors.lastname: Wan
authors.forename: H
authors.initials: H
authors.lastname: Xia
authors.forename: Z
authors.initials: Z
authors.lastname: Chen
mesh_terms: D010573:Pesticide Residues / Q000302:isolation & purification*; D012995:Solubility; D013662:Tea / Q000737:chemistry*; D014867:Water
chemical_list: D010573:Pesticide Residues; D013662:Tea; D014867:Water