TY - JOUR T1 - Determination of ten sulfonyl urea herbicides in unpolished rice by solid-phase extraction cleanup and LC-diode array detection. AU - Akiyama,Yumi, AU - Yoshioka,Naoki, AU - Tsuji,Masahiko, PY - 2002/7/3/pubmed PY - 2002/8/7/medline PY - 2002/7/3/entrez SP - 99 EP - 103 JF - Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan JO - Shokuhin Eiseigaku Zasshi VL - 43 IS - 2 N2 - A liquid chromatographic (LC) method with diode array detection (DAD) was developed for screening of 10 sulfonyl urea herbicide residues in unpolished rice. The investigated herbicides were azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron, ethoxysulfuron, flazasulfuron, imazosulfuron, metsulfuron-methyl, pyrazosulfuron-ethyl and tribenuron-methyl. Acetonitrile-water (2:1) extracts of rice samples were cleaned up with solid-phase extraction cartridges (octadecylsilane-bonded silica (ODS) and graphitized carbon black (GCB)). Three fractions of the GCB eluate were taken for analysis using 3 separate injections in order to avoid interference in LC-DAD analysis and to reduce analyte coelution problems. Recoveries from rice samples fortified with the 10 herbicides at 0.05 and 0.2 microgram/g ranged from 46.6 to 119.6%, and coefficients of variation were 3.1-12.6%. The quantitation limits were 0.01-0.02 microgram/g. SN - 0015-6426 UR - https://www.unboundmedicine.com/medline/citation/12092420/Determination_of_ten_sulfonyl_urea_herbicides_in_unpolished_rice_by_solid_phase_extraction_cleanup_and_LC_diode_array_detection_ DB - PRIME DP - Unbound Medicine ER -