Flow-injection fluorimetric determination of nabam and metham

A simple and sensitive flow-injection fluorimetric method was developed to determine nabam or metham in water and cereal samples. The procedure is based on the oxidation of these pesticides by thallium(III) with the concomitant formation of fluorescent thallium(I). Lineal calibration graphs were obtained between 0.25 and 2.56 muml(-1) for nabam, and between 0.26 and 2.65 mug ml(-1) for metham. The sampling rate was 80 samples h(-1). The method was satisfactorily applied to the direct analysis of water, wheat, barley and oat samples spiked with nabam or metham.