The method for determining oil consists of oil extraction with a liquid organic extractant with a high concentration of the sample and subsequent measurement of the optical density of the filtrate by a photometric method. It was found that oil absorbs light much better in the near ultraviolet region of the spectrum (315 nm), available for modern photocolorimeters.
Method 1. A portion of water contaminated with oil is placed in a 100 ml volumetric flask with a glass stopper and 1.5 ml of benzene is added. Stopper and mix by inverting the flask several times. After stratification, the extract is taken with a medical syringe with a long needle. Pour a new portion of benzene and repeat the extraction operation 3-4 times. The volume of the extract is adjusted to 10 ml with benzene. Measurement of the optical density of the resulting solution is carried out on a photocolorimeter at a wavelength of 315 nm. It was found that the optical density in the range of low concentrations linearly depends on the oil concentration.
Method 2. 1 liter of contaminated water is passed through a paper filter with a yellow ribbon, which is located in a glass funnel. The filter is dried and placed in a 10 ml plastic medical syringe, which is filled with 3 ml benzene. The extract is then pushed out of the syringe. This operation is carried out at least 2 times. The washing operation is repeated with a new portion of benzene. Both portions of the extract are placed in a 10 ml pycnometer and brought up to the mark with benzene. Photometry the resulting solution at a wavelength of 315 nm.
- high sensitivity of the method – analytical limit for determining the concentration of oil in water 0.003 mg / l;
- analysis of fresh and sea water possible.
- the analytical limit for determining the concentration of oil in water according to method 1 is 0.003 mg / l;
- according to method 2 for a solution containing 0.2 mg of oil per 1 liter of water, the optical density in a cell with a working layer thickness of 10 mm was 0.103. If we assume that the limit for determining the optical density is 0.001, then the possible limit for determining the concentration of oil is 0.002 mg.
The development is designed to determine low concentrations of oil in natural and industrial waters by the photometric method.
TECHNICAL AND ECONOMIC EFFECT:
The use of possible equipment is a photoelectric colorimeter, for example, KFK-2MP, which makes it possible to measure the optical density in the near ultraviolet region of the spectrum.
Monitoring the state of drinking and natural water, industrial effluents.
Ready for implementation.
Ready for implementation.
Sale of patents. Sale of licenses. Joint industrialization.
2 patents of Ukraine.