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Idaho State Police Forensic Services Toxicology Work Instructions Rev. 1 Issued: 1/16/13 Issuing Authority: Quality Manager 1 of 4 WORK INSTRUCTIONS 2.3 .6 Cocaine a nd Cocaine Metaboli tes Employ ing Unit ed C hemic al T echno log ies (U CT) 200 mg CLEAN SCREEN® DAU Extracti on Column  REFERENCE MATERIAL Stock Solutions 1mg/mL Benzoylecgonine, Cocaine, Ecgonine Methyl Ester and Mepivacaine. Working Control Solution  Add designated volume of Stock Solutions to 10mL Methanol. Solution is stable for one year when stored under refrigeration. . Working Internal Standard Solution  Add 100μL Mepivacaine stock solution to 10mL Methanol. Solution is stable for one year when stored under refrigeration. ELUTION SOLVENT Elution solvent must be prepared fresh. Mix 20mL 2-Propanol with 2mL Ammonia Hydroxide in 100mL ball flask. Bring up to volume wi th Methylene Chloride and mix well. Stock Solution Volume (  L) ng /  L Benzoylecgonine 100 10 Cocaine (optional) 100 10 Ecgonine methyl ester (optional) 100 10

Work Instructions 2.3.6 BECG Rev 1

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