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美国科学60秒 SSS 2012-12-17

时间:2013-06-25 08:31来源:互联网 提供网友:gmeng   字体: [ ]
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 This Scientific American’s podcast is sponsored by audible.com, the number-one online resource for best-selling audio books and more. And now audible.com is offering Scientific American listeners a free audio book of your choice. For details go to audible.com/sciam.

 
Onions and garlic add pizzazz to your cooking. But they can also do a more distasteful job: onions and garlic can suck heavy metals from industrial wastewater. So finds a study in the International Journal of Environment and Pollution. 
 
Good recipes start with the right ingredients. So Indian researchers rounded up onion and garlic peels from the canning industry, and dried and powdered them. They got industrial runoff from an electric motor factory in Delhi, laced with pollutants1 like arsenic2, iron, lead, nickel and tin. They spiked3 that runoff with even more heavy metals. And then added a pinch of onion powder.
 
In just half an hour, the onion gunk mopped up nearly 70 percent of the lead, iron and tin in the wastewater. It might work because onions and garlic contain a dietary fiber4 called inulin, which can bond with metal ions.
 
Conventional wastewater treatment is pricey - small industries in developing countries can't afford it. So low-tech solutions like this might help clean up waterways like India's Yamuna River - a waterway so polluted that it might be freshened by onions and garlic.

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1 pollutants 694861490fe64672170a0da250a277c7     
污染物质(尤指工业废物)( pollutant的名词复数 )
参考例句:
  • Pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
  • The 1987 Amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条(g)的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法
2 arsenic 2vSz4     
n.砒霜,砷;adj.砷的
参考例句:
  • His wife poisoned him with arsenic.他的妻子用砒霜把他毒死了。
  • Arsenic is a poison.砒霜是毒药。
3 spiked 5fab019f3e0b17ceef04e9d1198b8619     
adj.有穗的;成锥形的;有尖顶的
参考例句:
  • The editor spiked the story. 编辑删去了这篇报道。 来自《简明英汉词典》
  • They wondered whether their drinks had been spiked. 他们有些疑惑自己的饮料里是否被偷偷搀了烈性酒。 来自辞典例句
4 fiber NzAye     
n.纤维,纤维质
参考例句:
  • The basic structural unit of yarn is the fiber.纤维是纱的基本结构单元。
  • The material must be free of fiber clumps.这种材料必须无纤维块。
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