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This paper presents a new photochemiluminescent system for the determination of chlorsulfuron in water samples. The light from a low-pressure mercury lamp is used as a clean, reproducible, and inexpensive "reagent" for the derivation of the pesticide, performed in glycine buffer at pH 9.5. Then, the photo-products from irradiation are oxidized by permanganate in sulfuric acid solution. The oxidation reaction was favored by using high temperatures. A comparative study and discussion about the use of polyphosphoric acid instead of sulfuric acid in the oxidation reaction is also presented.The use of solenoid valves allows for the easy, complete automation of the process with low sample and reagent consumption. The calibration graph was linear over the range 0.1-1.3 mg L 21 of chlorsulfuron, the limit of detection was 0.06 mg L 21 , and the throughput was 25 h 21 . The proposed method was applied to the determination of the pesticide in spiked mineral water samples.

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