| Oil spill and pollution frequently occur in the process of oil exploitation andtransportation. Nowadays, oil spill and pollution are serious and have aroused theattention of people. Oil in water will destroy the ecological balance of water, and itcan not only lead to the death of aquatic organism, fishery damage and rare speciesextinction, but also endanger human health and cause huge economic loss to thegovernment and people. Therefore, it is important for the water quality managementand pollution prevention to measure the oil concentration in water with high accuracyin a short time.There are a variety of methods that can be used to measure oil concentration inwater including infrared absorption spectroscopy, ultraviolet spectrophotometer andgas chromatography, which have been widely used in daily monitoring, however, oiltype and other organic materials of samples can affect the results. In many cases, theinstrumental calibration is literally impossible because the oil composition of asample, e.g. wastewater, is rarely known. What is more, method such as infraredabsorption spectroscopy needs to take up long time to prepare samples withcomplicated operations, and it also needs reagents to extract oil component from water.So they are not suitable for online use to provide real-time responses. On the basis ofliterature review, online detection technology of oil in water based on thenear-infrared scattering method is presented.A novel technology to measure oil concentration in water is presented, andnear-infrared scattering theory was creatively introduced to oil-in-water detection inthis study. Exploratory experimental and theoretical studies were carried out onnear-infrared scattering method for the determination of oil in water.Secondly, the measurement system was designed to detect oil concentration inwater based on the near-infrared scattering theory. System is small in size, withoutchemical reagents, simple operation, suitable for in situ measurement of oil in water.Finally, we study the scattering light distribution of oil particle and establish thecorrelation between the scattering signal and the oil content. Comparing with nationalstandard method, the accuracy of the detection system is verified. By simulating the actual environment, stable and reliable experimental data are obtained.A variety of oil samples were examined to obtain both scattering and infraredabsorption spectra, and the linear correlation between light scattering intensity andmeasures with infrared spectrophotometry is more than0.98, what is more, comparingto the conventional methods, light scattering method requires no chemical reagents,and it is suitable for in situ measurement of oil in water. |
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