@article {671588, title = {Portable X-Ray fluorescence as a rapid determination tool to detect parts per million levels of Ni, Zn, As, Se and Pb in human toenails: A South India case study}, journal = {Environ. Sci. \& Technol.}, year = {2021}, author = {M. Bhatia and A. Specht and V. Ramya and D. Suleiman and M. Konda and P. Balcom and E. Sunderland and A. Qureshi} }