We are planning to perform multiresidue analysis for pesticides in water. The target groups are OCP, OP, Carbamates and Pyrethroids. Due to multiple sampling sites, collecting 500ml water for each target group will result in handling difficulties related to large quantities and logistic issue. Any suggestion on recent and validated methods with higher recoveries using small amount of water?
I think rotary evaporator is the best possible solution in this regard. Any solvent (i.e. Petroleum Ether, Chloroform, Methanol, Acetone, n-hexen or even water) can be easily evaporate with the help of rotary evaporator. In this device the solution (mixture of water and extract of pesticide) is heated at a controlled temperature where the chemical nature of that extract (components) remain unchanged. the round shaped flask containing the mixture rotating throughout a water (Cold) bath So that the temp. of the extract within the limit. A vacuum pump attached with that system substantially reduce the pressure within the evaporator system. A collecting flask (round shaped) at the bottom of the condenser attached by a clip, to store the distilling solvent after re-condensed.
There are many ways to reduce sample size that fall under the disperse liquid-liquid microextraction technique (DLLME) which can be used in your case
https://link.springer.com/article/10.1007/s00216-017-0798-4
Thanks all for your answers.
Dr. Sabry, the paper shared by you is extremely helpful and is exactly what I was looking for. Thanks a lot!!
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