SHARMA, I.D.MISHRA, RAJANISH CHANDRA2016-07-232016-07-232011http://krishikosh.egranth.ac.in/handle/1/69469ABSTRACT The present investigation entitled, “Solid phase extraction and cleanup of apple, cabbage and cauliflower for Gas Chromatographic determination of pesticides” was carried out under laboratory conditions from 2008 to 2010. Forty one pesticides (α-HCH, β-HCH, γ-HCH, δ-HCH, aldrin, chlorpyrifos, α-endosulfan, p’p,- DDE, o’p,-DDD, β-endosulfan, p’p,-DDE, endosulfan sulfate, o’p,DDE, dicofol, diazinon, p’p,-DDT, λ-cyhalothrin, cypermethrin, fenpropathrin, deltamethrin, fenvalerate, phorate, chlorpyrifos- methyl, methyl-parathion, fenitrothion, malathion, fenthion, quinalfos, profenofos, ethion, anilophos, phosalone, chlorfenvinfos, chlorothalonil, fluchloralin, alachlor, pendimethalin, fipronil, butachlor, fenazaquin and hexaconazole) were analyzed by using three different analytical methods viz., Solid Phase Extraction, QuEChERS and CDFA in apple, cabbage and cauliflower. The cleanup efficiency of six different solvents (dichloromethane, hexane, acetone, ethyl acetate, dichloromethane:hexane:acetonitrile and dichloromethane:acetone) from seven different SPE mini columns (silica gel, cyclohexyl, aminopropyl, Florisil, cynopropyl, C18 and C8) in SPE method were evaluated. In addition, five different QuEChERS cleanup adsorbents (florisil, silica gel, aluminium oxide, charcoal and PSA+GCB) were also evaluated. Acceptable relative recoveries of forty one pesticides using all the three methods ranged between 60.42-97.42%, 60.7397.94% and 58.80-95.98%, respectively in apple, cabbage and cauliflower. Among different solvents, the mixture of dichloromethane:hexane:acetonitrile (50:48.5:1.5) exhibited the best recoveries (88.05%) for all the pesticides. Among SPE mini columns, Florisil gave maximum recoveries of pesticides which ranged from 91.40-92.11% irrespective of plant matrices. The LOQ of al the pesticides was found to vary between 2-3 time of the LOD. Among different methods, QuEChERS method was found to be the most economical (Rs 157.00) and time saving (45 minutes) for sample processing giving >90% recovery of pesticides.en##Unable to generate tags mishra pdfnew1.pdfApples, Cabbage and Cauliflowe,pesticidesThesis