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Joint effects of galaxolide and cadmium on actinomycetes quantities in soils.

LU Ze1,2, HU Xiao-min1**, AN Jing2, WEI Wei3   

  1. (1School of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China; 2Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China)
  • Online:2014-06-10 Published:2014-06-10

Abstract:

HHCB is one of the most significant PPCPs pollutants concerned by environmental scientists. Meanwhile, Cd is one of the most important heavy metal pollutants existing widely in environment. Combined exposure of HHCB and Cd is possible in the soil ecosystem. However, few studies have been reported regarding the impacts of joint pollution of these two pollutants on soil microbes. In this paper, the joint toxic effects of HHCB and Cd on actinomycetes were studied using soil microcosm for a 10 week duration. Results showed that single and joint effects of HHCB and Cd on actinomycetes quantities in soils were markedly significant (P<0.01). The inhibitory effect of actinomycetes quantities in soils increased with the increase of HHCB concentration under both single and combined treatments of HHCB and Cd. The doseeffect relationship between HHCB and the inhibitory rate of actinomycetes quantity in soils was logarithmic. The EC50 value was the least in the 3rd week after treatment.  In the first 5 weeks of incubation, the EC50 values were not more than 10 mg·kg-1. It was suggested the joint effects of HHCB and Cd were antagonistic. It could be concluded that the input characteristics of HHCB to soils should be considered for selecting a suitable EC50 value for assessing its ecological risks in soils.
 

Key words: assessment methodology., formation mechanism, VOSCs, Geosmin, black and odorous water body