Abstract
An analytical method for down to 0.1 ppm of oil in waste water was studied and the recommended analytical procedure was presented. Small amounts of oil was found to be selectively absorbed by sericite powder and carbon of the powder absorbing oil was determined. Absorption method for small amounts of oil, effect of pH of sample solution and co-existing materials in the solution, analytical method for determination of carbon in the powder absorbing oil and oil itself and pretreatment of sample solution were studied and discussed in details. The recommended procedure is as follows.
Sample solution (10-100 ml) is filtrated by Nuclepore filter (5μ) and washed by ethyl alcohol. The filtrate is mixed for about 1 min with 10 mg of sericite powder under ultrasonic agitation (40.5 KHz). The powder absorbing oil is separated by filtration with Nuclepore filter (1μ) and washed by water. The powder with the filter is dried at about 50°C. After the filter is removed, carbon of the powder absorbing oil is determined by the conventional combution carbon analyzer at the combution temparature of 900°C.
