diazinon is highly soluble in water i.e.0.04 g/L (40 mg/L) at 20 °C and 30 °C it is soluble in ethyl ether+ petroleum ether or petroleum ether alone has been used for the residue of this pesticide, reports on acetone+hexane mixture also available.

I suggest ethyl ether+ petroleum ether mixture.

wish you good luck

You can apply QuEChERs method and then GC or LC-MS. Be carefull with th estone the MRL include this.

I think Quick, Easy, Cheap, Effective, Rugged, and Safe, the QuEChERS method is based on work done and published by Anastassiades et al.( AOAC Int. 86 (2003) 412-431.) QuEChERS is developed from fruits and vegetables, pesticides extraction with cleanup of carbohydrates, fats,  proteins, pigments, etc . This technique is an alternative to liquid-liquid and solid phase extractions. The procedure includes two simple phases. First, the homogenized samples are extracted and partitioned using an organic solvent and salt solution. Then, the supernatant is further extracted and cleaned using a dispersive solid phase extraction (dSPE) technique. These methods are appraised general acceptance.

• Original Unbuffered Method

Fast and Easy Multiresidue Method Employing Acetonitrile Extraction/Partitioning and “Dispersive Solid-Phase Extraction” for the Determination of Pesticide Residues in Produce [Anastassiades et al.( AOAC Int. 86 (2003) 412-431.)]

• European EN 15662 Method EN 15662, Foods of Plant Origin—Determination of Pesticide Residues Using GC-MS and/or LC-MS/MS Following Acetonitrile Extraction/Partitioning and Clean-up by Dispersive SPE—QuEChERS method, 2008. http://www.chromnet.net/Taiwan/QuEChERS_Dispersive_SPE/QuEChERS

• AOAC Official 2007.01 Method AOAC Official Method 2007.01, Pesticide Residues in Foods by Acetonitrile Extraction and Partitioning with Magnesium Sulfate, 2007. http://www.weber.hu/PDFs/QuEChERS

In the case of Diazinon in dates I recoommend to use the CEN  method with PSA to clean the extract as much as possible

I agree it could be a better option

Be aware that extract clean-up with PSA should be avoided in case of acidic analyses.