Determination Method of Cinosulfuron Residue in Rice

A determination method of cinosulfuron residue was established. The residue was extracted by methanol, cleaned with liquid-liquid extraction and C18 SPE column. The target ingredient was separated by high performance liquid chromatography and detected by UV detector at 250 nm. The recoveries of the method ranged from 69 to 95%, with the coefficient of variation from 3.5 to 9.0%. The minimum detectable quantity of cinosulfuron standard was 2.0×10-9 g. The lowest detectable concentration of field water, soil, rice straw, rice shell and hulled rice samples were 0.005 mg/L, 0.01, 0.05, 0.05, 0.01 mg/kg, respectively. The determination method can be widely applied on different environmental and plant samples.