[The concentration and source of atrazine residue in water of Guanting reservoir].

The atrazine in water was determined by SPE-LC-MS. It only took 40 min to analysis a sample. The detection limit was 10 ng/L. Atrazine was detected in water of Guanting reservoir. The concentration of atrazine in water samples of Guanting reservoir was 0.67-3.9 micrograms/L. The source of atrazine in water was discussed. A plant situated at upstream of Yanghe River was thought a primary source of atrazine in Guanting reservoir.