Table of Contents
ISRN Nanomaterials
Volume 2013 (2013), Article ID 207239, 7 pages
Research Article

Harmful Impact of ZnS Nanoparticles on Daphnia sp. in the Western Part (Districts of Bankura and Purulia) of West Bengal, India

1Department of Physics, Ramananda College, Bishnupur, Bankura, West Bengal 722 122, India
2Department of Zoology, Ramananda College, Bishnupur, Bankura, West Bengal 722 122, India
3Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan

Received 24 June 2013; Accepted 7 August 2013

Academic Editors: S. Misra, X. Tian, and Z. Xu

Copyright © 2013 Baibaswata Bhattacharjee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


ZnS nanoparticles of different sizes are synthesized employing a simple wet chemical method. These nanoparticles are used to study their impact on the Daphnia sp. through traditional toxicity tests. The percentage of mortality is found to increase initially with increasing nanoparticle concentration or exposure time and is finally found to saturate for higher concentrations or exposure times. Mortality is found to be higher for smaller particles. Hopping frequency and heart rate are also found to increase with increasing nanoparticle exposure time for a fixed nanoparticle concentration. These observations can be attributed to the enhanced surface photooxidation property of the ZnS nanoparticles. Thus the present study will help people to understand the hitherto unknown harmful impact of ZnS nanoparticles on aquatic organisms in the western part of West Bengal (Bankura and Purulia districts), India.