Sensitivity and Resolution Captan and Coumaphos


I have a GCMSMS TQ (8990GC/7010B GCTQ) and developing a Pesticides method. Captan and Coumaphos recoveries (responses)/resolution in the lower half of the calibration is bad to non existence. Using CF,20 min method and AP with sandwich technique. Other compounds look good. Any suggestions on how to improve the sensitivity/resolution for those 2? 


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