Dissolved organic matter(DOM) in nature waters(e.g. ground water, lake, river and ocean) receives much attention because of its remarkable ecology and the environment function. More importantly, DOM can affect the fate of the contaminants in environment. For instance, interactions between contaminants and DOM can change their transport, toxicity and bioavailability, attenuating their harm for organisms. In this work, we fractionated large amounts of lake water into hydrophobic DOM-fractions and determined t...