Analysis of petroleum-polluted water absorption spectral properties
石油类污染水体吸收特性分析

Petroleum pollutions exist in waters in various forms, which impacts its apparent optical properties and inherent optical properties. Field works has been carried out in the rivers in Panjin city, Liaoning province of China in May 2008 in order to understand this impact. The absorption coefficient data of yellow substance, De-pigment particles and phytoplankton pigments and the corresponding water samples for laboratory measurements of chlorophyll, petroleum pollutions, and suspended material were collected. Firstly, absorption spectral features of yellow substance, De-pigment particles and phytoplankton pigments in Case II water were analyzed. Secondly, the absorption spectral properties of yellow substance and phytoplankton pigments with petroleum pollutions were discussed. Finally, the impact of petroleum pollutions on water absorption properties was analyzed using the method of algebraic difference. The results showed that (1) whether there is petroleum substance or not in water body, the absorption spectra of yellow substance and de-pigment particles all follow e-exponential attenuation trend in the research region; (2) with the presence of petroleum pollution, the absorption coefficients of yellow substance and phytoplankton pigments are both increased; (3) the absorption spectral feature of petroleum pollution appears similar to those of the yellow substance and de-pigment particles by following an e-exponential attenuation trend. However, it is feasible to distinguish them because their spectral exponential slopes have obvious difference.