From a Material Safety Data Sheet - Benzene has a Specific Gravity of .88 with water at 1.0, so it will float on the surface of the river. It is slightly soluble in water, 0.18%. Therefore, it should act much like a gasoline spill on water- mostly evaporate over time - flammable under the right conditions. This is a huge spill and the cold temperatures won't help evaporation, but long-term it should not be a huge disaster. If they had their act together, they could be using floating booms and skimming it off the water. Not very likely in China, I'm afraid.
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