首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
医学
Rain is not what it used to be. A new study reveals that much of the precipitation in Europe contains such high levels of dissol
Rain is not what it used to be. A new study reveals that much of the precipitation in Europe contains such high levels of dissol
admin
2013-10-31
66
问题
Rain is not what it used to be. A new study reveals that much of the precipitation in Europe contains such high levels of dissolved pesticides that it could be illegal to supply it as drinking water.
Studies in Switzerland have found that rain is laced with toxic levels of atrazine, alachlor and other commonly used crop sprays. "Drinking water standards are regularly exceeded in rain," says Stephan Muller, a chemist at the Swiss Federal Institute for Environmental Science and Technology in Dubendorf. The chemicals appear to have evaporated from fields and become part of the clouds.
Both the European Union and Switzerland have set a limit of 100 nanograms for any particular pesticide in a liter of drinking water. But, especially in the first minutes of a heavy storm, rain can contain much more than that.
In a study to be published by Muller and his colleague Thomas Bucheli in Analytical Chemistry this summer, one sample of rainwater contained almost 4000 nanograms per liter of 2,4-dinitrophe-nol, a widely used pesticide. Previously, the authors had shown that in rain samples taken from 41 storms, nine contained more than 100 nanograms of atrazine per liter, one of them around 900 nanograms.
In the latest study, the highest concentrations of pesticides turned up in the first rain after a long dry spell, particularly when local fields had recently been sprayed. Until now, scientists had assumed that the pesticides only infiltrated groundwater directly from fields.
Muller warns that the growing practice of using rainwater that falls onto roofs to recharge underground water may be adding to the danger. This water often contains dissolved herbicides that had been added to roofing materials, such as bitumen sheets, to prevent vegetation growing. He suggests that the first flush of rain should be diverted into sewers to minimize the pollution of drinking water, which is not usually treated to remove these herbicides and pesticides.
Muller and Bucheli found that 2,4-dinitrophenol______.
选项
A、is widely used in agriculture
B、exceeded atrazine in the rain samples
C、can be measured in the units of nanograms
D、was far in excess of limit in drinking water
答案
D
解析
第二段讲到在上述含有杀虫剂的雨水中有很多有毒成分超出了drinking water standards。后面提到Muller和Bucheli检测出的2,4-dinitrophenol的含量时用了almost一词,由此可以推断这种杀虫剂的含量是超出饮用水标准的。
转载请注明原文地址:https://kaotiyun.com/show/dhU3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
Justbeforedawnwereceivedacallthatanunresponsiveinfantwasbeingbroughtbyemergencymedicalservicestoourhospital.
Itisanaturalmarvel.Allofthelifeoftheearthdies,allthetime,inthesamevolumeasthenewlifethatdazzlesuseach
Whensomeoneasksyoutohisorherhome,itisveryclearwhoistheguestandwhoisthehost,butinvitationstorestaurantf
A、Theassistantsmustknowtheirnames.B、Theytellwhattheirmajorsare.C、Toomanynon-studentsusethelab.D、Thecomputers
AboywhostrugglestoreadEnglishprimary-schoolstorybooksyethasnotroublewithuniversityphysicstextbooksinJapanesei
Depressionisastateoflowvitalityanddiscontentwithlifeinwhichtheindividualwithdrawsfromnormallifeactivitieseve
Whilemanyapplaudtheincreasingindividualismandfreedomofchildrenwithinthefamily,otherslamentthelossoffamilyresp
Microsoftisnolongertheworld’sbiggestcompany【C1】______marketcapitalization.ThreeotherU.S.companieshaveovertaken【C
Noneofusexpectedthechairmanto______attheparty.Wethoughthewasstillinhospital.
A、IthappenedearlylastFridaymorning.B、Itlastedformorethanonehour.C、IttorethroughtheNewTerritories.D、Itcaused
随机试题
DaydreamingI.DaydreamingcanbeharmfulbecauseitwasconsideredasA.awasteof【T1】______B.a【T2】______ofneur
有关市场的论述,以下正确的是_______。
患者男性,23岁,以四肢无力3d为主诉来诊,患者于1周前淋雨,3d前出现四肢对称性乏力,以下肢为重,不能行走,且日益严重,于当地医院行血钾检测为正常,来诊。考虑患者为何种疾病
类风湿性关节炎的护理措施中最重要的是
属于药物流产禁忌证的是
A.副反应B.质反应C.量反应D.停药反应E.变态反应
下列各项中.属于利得的有()。
备注视图中的注释信息在文稿演示时(32)。
Britishuniversities,groaningundertheburdenofahugeincreaseinstudentnumbers,arewarningthatthetraditionofafree
A、Howtodealwiththeaggravatingpeople.B、Howtodealwithbosses.C、Howtomanagethesubordinates.D、Howtochangeyourself
最新回复
(
0
)