Determination of Maleic Hydrazide Residues in Tobacco

The residues of maleic hydrazide (MH) in 239 domestic tobacco leaf, 49 imported tobacco leaf and 12 imported cigarette samples were determined according to ISO 4876-1980.The results showed that:1) the detectable rate of MH in the domestic tobacco leaves was 6.69%, the highest residue was 54.00mg/kg, the lowest 1.50mg/kg, and the mean value 6.82mg/kg;2) the detectable rate of MH in the foreign cigarettes was 58.33%, the highest residue was 42.75mg/kg, the lowest 7.75mg/kg, the mean value 17.57mg/kg;and 3) the detectable rate of MH in the imported tobacco leaves was 30.61%, the highest residue was 14.00mg/kg, the lowest 1.50mg/kg, and the mean value 5.63mg/kg.