title: Photodegradation and flow-injection determination of simetryn herbicide by luminol chemiluminescence detection.
abstract: A novel and simple flow injection chemiluminescence method is reported for the determination of simetryn, a common herbicide. The method is based on the direct oxidation of luminol by the photoproducts of the simetryn in alkaline medium in the absence of catalyst/oxidant. The linear concentration range was 0.01 - 2 microg mL(-1) simetryn with a correlation coefficient (r(2)) of 0.9997 and relative standard deviations (RSD; n = 4) in the range of 0.9 - 2.3%. The limit of detection (S/N = 3) was 7.5 ng mL(-1) with a sample throughput of 100 h(-1). The proposed method has been applied to determine simetryn in natural waters using Sep-Pak C(18) cartridges for solid phase extraction (SPE) procedure. The recoveries were in the range of 97 +/- 1 to 104 +/- 2%. The mechanism of chemiluminescence reaction has also been discussed briefly.
authors.affiliation: Department of Chemistry, University of Balochistan, Quetta, Pakistan. waseemq2000@hotmail.com
authors.forename: Amir
authors.initials: A
authors.lastname: Waseem
authors.forename: Mohammad
authors.initials: M
authors.lastname: Yaqoob
authors.forename: Abdul
authors.initials: A
authors.lastname: Nabi
mesh_terms: D002138:Calibration; D017022:Flow Injection Analysis / Q000295:instrumentation / Q000379:methods*; D006540:Herbicides / Q000032:analysis* / Q000528:radiation effects; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods*; D008165:Luminol / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012972:Sodium Hydroxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D013997:Time Factors; D014227:Triazines / Q000032:analysis* / Q000528:radiation effects
chemical_list: D006540:Herbicides; D014227:Triazines; C033807:simetryn; D012972:Sodium Hydroxide; D008165:Luminol