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 CaseⅡwater 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.