SPE preparation waste water
Posted: Wed Apr 23, 2014 11:14 am
I'm trying to find an SPE method for the analysis of organophosphor and organochloride pesticides in wastewater.
currently i'm using Oasis HLB column with following method:
1) wash column with DCM, ACN and water
2) load sample
3) wash with 30% MeOH in water
4) dry for 30 minutes
5) elute with DCM
6) inject with Large-volume injection on GC/MS (single quad)
this method works for drinking water,... but for wastewater i still have a lot of coeluting peaks. there is still a lack of selectivity...
any help to improve this method?
.
currently i'm using Oasis HLB column with following method:
1) wash column with DCM, ACN and water
2) load sample
3) wash with 30% MeOH in water
4) dry for 30 minutes
5) elute with DCM
6) inject with Large-volume injection on GC/MS (single quad)
this method works for drinking water,... but for wastewater i still have a lot of coeluting peaks. there is still a lack of selectivity...
any help to improve this method?
.