D3230_11 (13)

To a dry, 100 milliliter, graduated glass-stoppered cylinder, add 15 milliliters of xylene, and using the same type of volume transferring device used in section 10.3 of the standard, that is either a 10 milliliter pipette total delivery-- see section 6.3 of the Written Standard-- or 10 milliliter graduated cylinder-- see section 6.3.1 of the Written Standard-- where applicable. Transfer 10 milliliters of the crude oil sample into the 100 milliliter, graduated glass stoppered cylinder. Rinse the 10 milliliter pipette or 10 milliliter graduated cylinder with xylene until free of oil. Make up 50 milliliters with xylene. Stopper and shake the cylinder vigorously for approximately 60 seconds. Dilute to 100 milliliters with mixed alcohol solvent. And again, shake vigorously for approximately 30 seconds. After allowing the solution to stand for approximately 5 minutes, pour it into the dry test beaker. Follow the procedure in section 10.4 of the Written Standard to obtain voltage and current readings. Record the indicated electrode current to the nearest 0.01 milliamperes and to the nearest voltage. See note 6. Remove the electrodes from the sample solution and clean the apparatus.