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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front Envir Sci Eng    2012, Vol. 6 Issue (4) : 518-523    https://doi.org/10.1007/s11783-012-0427-6
RESEARCH ARTICLE
Assessment of toxicity of two nitroaromatic compounds in the freshwater fish Cyprinus carpio
Hongyan SHEN1,2(), Jixi GAO1,3, Jinsheng WANG1
1. College of Water Science, Beijing Normal University, Beijing 100875, China; 2. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China; 3. Nanjing Institute of Environmental Sciences, SEPA, Nanjing 210042, China
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Abstract

This study was conducted to evaluate the toxicological response of p-nitrotoluene and p-nitroaniline to the key fish species, Cyprinus carpio. A freshwater fish bioassay based on the 96 h LC50 was used to estimate the single and joint toxicity of the two chemicals. The toxicity of p-nitrotoluene was greater than that of p-nitroaniline based on 96 h LC50 values of 40.74 mg·L-1 and 48.99 mg·L-1, respectively. Both compounds had moderate toxicity toward Cyprinus carpio, and this toxicity increased with the exposure duration and concentration. Binary mixtures of the compounds were more toxic than the individual compounds at 96 h, and they acted upon partial addition. When the exposure time was longer, the toxicity increased for mixtures of compounds with the same concentration or toxicity. The results of this study suggest that exposure to a combination of these chemicals would result in a higher environmental risk in aquatic systems than exposure to either compound alone. Further research is needed to investigate the combined effects and sublethal toxicity of p-nitrotoluene and p-nitroaniline, since they are both still used in China.

Keywords joint toxicity      Cyprinus carpio      LC50      p-nitrotoluene      p-nitroaniline      toxic unit     
Corresponding Author(s): SHEN Hongyan,Email:shy0405@sina.com   
Issue Date: 01 August 2012
 Cite this article:   
Hongyan SHEN,Jixi GAO,Jinsheng WANG. Assessment of toxicity of two nitroaromatic compounds in the freshwater fish Cyprinus carpio[J]. Front Envir Sci Eng, 2012, 6(4): 518-523.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0427-6
https://academic.hep.com.cn/fese/EN/Y2012/V6/I4/518
labellingclassificationcriteria
R50very toxic to aquatic organismsacute toxicity (LC50 (fish), or EC50 (daphnia), or IC50 (algae))≤1 mg·L-1
R50 and R53very toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environmentacute toxicity≤1 mg·L-1, and the compound is not readily degradable, or n-octanol/water partition coefficients (lg Kow)≥3 (unless experimentally derived bioconcentration factors (BCF)≤100)
R51toxic to aquatic organismsacute toxicity>1 mg·L-1 and≤10 mg·L-1
R51 and 53toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environmentacute toxicity>1 mg·L-1 and≤10 mg·L-1, and the compound is not readily degradable, or lg Kow≥3 (unless experimentally derived BCF≤100)
R52 and 53harmful to aquatic organisms and may cause long-term adverse effects in the aquatic environmentacute toxicity>10 mg·L-1 and≤100 mg·L-1, and the compound is not readily degradable, or lg Kow≥3 (unless experimentally derived BCF≤100)
R53 may cause long-term adverse effects in the aquatic environmentsolubility less than 1 mg·L-1, and not readily degradable, and lg Kow≥3 (unless experimentally derived BCF≤100)
Tab.1  Criteria in Annex VI to the European Community legislation on classification and labelling (Directive 67/548/EEC)
exposure time/hchemicalssingle LC50/(mg·L-1)equitoxic ratio LC50/(mg·L-1)equiconcentration ratio LC50/(mg·L-1)
24p-nitroaniline76.6743.7436.98
p-nitrotoluene44.7336.3636.98
48p-nitroaniline64.8243.7436.36
p-nitrotoluene44.2236.3636.36
72p-nitroaniline57.9640.2336.36
p-nitrotoluene42.7333.4436.36
96p-nitroaniline48.9936.9929.24
p-nitrotoluene40.7430.7529.24
Tab.2  Joint toxicity of -nitroaniline and -nitrotoluene in equiconcentration ratio and equitoxic ratio against
binary mixtureexposure time/hTUp-nitroanilineTUp-nitrotolueneM0Maction type
equiconcentration ratio240.4820.8271.5831.309partial addition
480.5610.8221.6821.383partial addition
720.6270.8511.7371.478partial addition
960.5970.7181.8321.315partial addition
equitoxic ratio240.5710.8131.7021.383partial addition
480.6750.8221.8211.497partial addition
720.6940.7831.8871.477partial addition
960.7550.7552.0001.510partial addition
Tab.3  Action of mixture toxicity of nitroaniline and nitrotoluene against
Fig.1  Diagram of combined effects of two binary mixtures on
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