Toxicity Effects of Pentachlorophenol on the Growth,the Contents of Pigments and Soluble Protein of Scenedesmus obliquus

Toxicity effects of pentachlorophenol(PCP) under different mass concentrations(0,0.02,0.05,0.10,0.50,1.00 mg/L) on the growth,the contents of pigments and soluble protein of Scenedesmus obliquus decreased with the increase of PCP mass concentration.EC_(50) value for 24,48,72,96 and 120 h was 0.883,0.283,0.225,0.168 and 0.192 mg/L respectively.The growth of algae was almost completely inhibited when PCP mass concentration was higher than 0.50 mg/L.Meanwhile,the mass concentrations of pigments and soluble protein in 96 h-culture algae solution were also determined.The total levels of pigments,soluble protein and the ratio between chlorophyll a and b declined as PCP mass concentration increased.The susceptibility of pigments to PCP followed the order of carotenoidchlorophyll achlorophyll b.There was an obvious linear relationship between the contents of pigments and soluble protein (r=0.793,n=6)。