Mercury
Mercury
Mercury
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2) The large amount of phosphates such as trimeric<br />
sodium phosphate ( 三 聚 磷 酸 钠 Na 5 P 3 O 10 )<br />
contained in detergents can cause eutrophy( 富 营<br />
养 化 ) to the water bodies. It’s estimated in Britain<br />
and U.S. and other other countries that 30%~75%<br />
phosphorus in the urban sewage comes from<br />
detergents. Also due to the large amount of<br />
discharged waste water, it would constitute<br />
hazards to aquatic plants and fish.<br />
3) Surface active agents can accelerate the<br />
emulsification and dispersion of petrol, PCBs and<br />
other indissolvable organic matters in water, thus<br />
raising the difficulty of waste water treatment.