Heavy Metal Ion Sensing By Surface Plasmon Resonance on Gold Nanoparticles

Surface Plasmon resonance (SPR) based heavy metal ions sensor is one of the most sensitive sensor for detecting toxic metal ions. It is an inexpensive, portable and also feasible for real time detection. SPR sensor is a type of optical sensor in which toxic metal ions get adsorbed on the functionalized metal (mostly Au) film causes the change in refractive index of the metal (Au)-dielectric (sensing) medium. The change of the refractive index leads to a shift in the angular spectrum of the reflected light and can be accurately monitored by optical methods. In this paper,we are trying to optimize the detection level of heavy metal ions by surface plasmon resonance on gold nanoparticles using UV-VIS spectroscopy. Polymer like chitosan is being used with gold nanoparticles to detect copper and zinc ions and detection till very low concentrations of the toxic metal ions is obtained.Keywords: Surface Plasmon Resonance, Optical sensor, metal nanoparticles, reducing agent,chelating agent, polymer capping.*Cite as: Sandhya Banti Dutta Borah, Sunandan Baruah, Waleed Soliman Joydeep Dutta “Heavy Metal Ion Sensing By Surface Plasmon Resonance On Gold Nanoparticles†ADBU-J.Engg Tech, 1(2014) 0011404(5pp

Towards a Theory of Tribal Social Work: Some Reflections on its Methodological Foundation

This paper engages with the theoretical evolution of Tribal Social Work in India, and attempts to provide a conceptual overview of some key constitutive elements of its methodological foundation. It uses the historical approach to trace the politico historical processes beginning 1935 and lays a framework that brings to bear significant processes that went into shaping meanings of categories and frames of reference vis-à-vis tribes. While unraveling varied processes surrounding the tribal debate in India from a critical perspective, the article posits a theoretico-methodological outline of tribal social work sourced from the author’s own experiences. This is done with the intention of advancing the theory of tribal social work within the Indian context and thus deepening and enriching social work discipline further