Study suggests besides the visible plastic, smaller bits also foul the waters
研究表明，除了可见的塑胶，（不可见的塑胶）小颗粒也在污染着海水 [attach]194252[/attach]
By Rachel Ehrenberg
作者：瑞秋 爱恩伯格
Web edition : Thursday, August 20th, 2009
网络版：2009年8月20日，星期四
1）WASHINGTON — From the beer cooler at the bow to flotation devices and bumpers, life on the sea often involves light, white foamed plastic, commonly known by the trademark Styrofoam.
2）But life in the sea is encountering the plastic as well.
但是海洋中的生命也一样遭受着塑胶的威胁。
3）The chemical building blocks of foamed polystyrene have been detected in several areas of the Pacific Ocean and lab experiments demonstrate that the plastic degrades at seawater temperatures, researchers reported August 19 at a meeting of the American Chemical Society.
4）“Plastics are a contaminant that goes beyond the visual,” says Bill Henry of the Long Marine Laboratory at the University of California, Santa Cruz.
加州大学圣克鲁兹分校长期海洋实验室的比尔亨利说：“塑胶是一种污染物，其危害性超出人们预料。”
5）The researchers’ reports are important, he says, because they provide “some of the first evidence of polystyrene as a potential contaminant to wildlife that’s more on the molecular level.”
6）Polystyrene foam is a manufactured plastic primarily made up of rings of carbon and hydrogen, called phenyl groups, attached to long hydrocarbon chains that can break into smaller styrene units.
7）Studies suggest that the smallest of these units — the styrene monomer — is carcinogenic in mice, but its effect on other organisms isn’t yet clear.
研究表明：最小的单元——苯乙烯单体——对小鼠有致癌性，但是（这种单体）对其他生物有无影响还不明确。
8）Water samples collected off Malaysia and the U.S. Pacific coast and in the northern Pacific Ocean all contained styrene monomers, as well as styrene dimers and trimers, reported Katsuhiko Saido of Nihon University in Chiba, Japan.
10）The team found that the various smaller styrene units were present in the same relative quantities Katsuhiko Saido of Nihon University in Chiba, Japan in both the lab and in the water samples.
11）Much of the research on plastic pollution in the oceans has focused on what can be seen with the naked eye, says Joel Baker of the University of Washington Tacoma.
位于塔科马地区华盛顿大学的乔尔贝克说：很多关于海洋白色污染的研究过去聚焦在能被肉眼看见的污染物上。
12）Studies on animals tend to investigate damage from plastic nets or ingestion of visible chunks.
关于动物的研究趋向于查明塑料网和对可见塑胶块吞食（给动物带来）的危害。
13）But this new work adds to a growing body of evidence that many kinds of plastics break down in seawater into pieces too small to see.
但是这项新研究增添了更多的证据证明很多种塑料制品在海水中降解到肉眼不可见的小颗粒。
14）“We are concerned that plastic pollution is also caused by these invisible materials and that it will harm marine life,” Saido said.
赛一朵说：“我们担心白色污染（不止有可见的污染物）也由这些不可见的、危及海洋生物的物质组成。”
15）While the potential toxicity of these tiny plastic constituents is understudied for much of marine life, plastics are abundant in many forms.
16）Marine litter is now 60 to 80 percent plastic, reaching 95 percent in some areas, according to a review by Charles Moore of the Algalita Marine Research Foundation in Long Beach, Calif., published in October 2008 in Environmental Research.
17）And plastics, including polystyrene, are common in the wads of accumulated undigested matter that young black-footed albatrosses cough up before they fledge, Henry says.
18）Getting at the effects on marine life is challenging—plastics travel long distances, their distribution in the oceans isn’t uniform and scientists are still refining methods to detect and analyze the materials. But, Baker says, “almost all of the plastic that enters the ocean stays in the ocean.”
19）Though plastics have benefits, Baker says, there’s a lot of gratuitous use. “Now is a ripe opportunity to be more judicious with how and when we use plastics to avoid this loading of the ocean,” he says.