南京大学学报(自然科学版) ›› 2013, Vol. 49 ›› Issue (3): 387–393.

• • 上一篇    下一篇

 大气CO2浓度升高对砷污染水体生态风险的影响*

 孙曙光，尹颖，郭红岩**
  

  • 出版日期:2015-11-05 发布日期:2015-11-05
  • 作者简介: (污染控制与资源化研究国家重点实验室，南京大学环境学院，南京，210046)
  • 基金资助:
     水利部公益型项目(201001010)

 Elevated CO2 levels affects the ecological risk of arsenic pollution water

 Sun Shu一Guang ,Yin Yinh ,Guo Honk-Yan   

  • Online:2015-11-05 Published:2015-11-05
  • About author: (State Key Laboratory of Pollution Control and Resources Rcuse,School of Environment
    Nanjing University,Nanjing,210046,China)

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摘要：  本文在开顶式气室OTC(Opcn Top Chamber)平台下，构建水生微宇宙系统.通过向底泥中外
源添加砷的方式污染水体.初步研究了当CO2浓度升高至550-650 ?mol/mol时，通气一段时间后，水
体I}化参数pH,Eh的变化规律.参照US Environmental Protection Agency慢性毒性标准测试方法，探
究了不同处理组水体综合毒性的大小，并以此来指示不同大气条件下砷污染水体生态风险的变化规律.
结果表明:通气一年后，与正常大气条件相比，CO2升高条件清洁水体的pH降低了0. 47,Eh降低了
13. 12 mv;砷污染水体pH降低了0. 58,Eh降低了12. 68 mv;底泥中pH和Eh也有降低趋势.羊角月牙
藻和大型蚤慢性毒性测试结果表明:CO2升高条件下，砷污染水体对羊角月牙藻的生长抑制作用强于正
常大气条件下砷污染水体，且CO2浓度的升高也加剧了砷污染水体对大型蚤繁殖能力的抑制作用，两
种生物毒性测试的结果基木一致.表明CO2浓度升高加剧了砷污染水体的生态风险，但导致风险加剧
的机理还有待进一步研究.

Abstract:  With increasing global industrialization,the atmospheric CO2concentration has risen from approximately
280?mol/mol in prcindustrial times to approximately 380 ?mol/mol now,and it is expected to continue increasing in
the future. increasing atmospheric CO2 causes climate warming and ocean acidification problems, It affects photosyn-
thesis of submerged plant and floating algae in the water and changes community structure of aquatic organisms.The
speciation of the minor elements together with the concentration of dissolved organic matter(DOM)in the water can
also be affected，thus bioavailability of minor elements will be changed.
Arsenic is a ubiquitous clement，which occurs naturally in the earth’s crust.lt has been used in various fields
such as medicine,clectronics,agriculture and metallurgy. Human activities such as mining,the burning of fossil fuels
and pesticide application are the main sources of arsenic pollution. Arsenic is toxic to both plants and animals and in
organic arsenicals arc proven carcinogens in humans. A wide range of arsenic toxicity has been determined that de
ponds on arsenic speciation. Recently, arsenic pollution accidents happened occasionally in China’s lakes and rivers，
which poses serious threat to the aquatic environment safety. Because of the chronic toxicity effects of arsenic, loner
term exposure to low concentration arsenic is still harmful to aquatic organisms, In the future, the concentration of
atmospheric CO2 will continue increasing, meanwhile, the living environment of aquatic organism, the speciation of at-
senic,and the concentration of arsenic adsorbed onto the surface of DOM or metal oxides will be changed. Will these
changes aggravate or alleviate the ecological risk of arsenic pollution water? It is a question to be answered.
This article simulated aquatic microcosms under Open Top Chamber(OTC) with 550一650 ?mol/mol of CO2
The ecological risk of arsenic pollution water was studied in these aquatic microcosms.The water was polluted by
adding sodium arsenate to the sediment of the aquatic microcosm, pH and Eh were measured in this article and chro-
nic toxicity testing with Daphnia magna and Sclenastrum capricornutum as the testing organism was performed. Af-
to a ycar,compared to the ambience condition, the pH of the norrpolluted water was reduced by 0.47 and the Eh
was reduced by 13. 12 mv,while the pH of the arsenic pollution water was reduced by 0. 58 and the Eh was reduced
by 12. 68 mv. Elevated CO2 levels also affected the pH and Eh of the sediment，but the differences were not signifi-
cant. Results of the bictoxicity testing showed that the arsenic pollution water under the elevated COQ condition had
more strongly inhibited the growth of Sclenastrum capricornutum,and the reproduction of Daphnia magna than the
arsenic pollution water under the ambience condition.This says that the elevated CO2 levels will increase the ecologi-
cal risk of arsenic pollution water, but the mechanism needs to be further studied.

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