AHMED, M. F. A., Y. LINGAPPA, and A. GLORY. “SPECTROPHOTOMETRIC DETERMINATION OF ARSENIC, LEAD IN ENVIRONMENTAL AND BIOLOGICAL SAMPLES USING 2, 5­THIOPHENE DICARBOXALDEHYDE, THIOSEMICARBAZONE”. International Journal of Chemistry Research, vol. 2, no. 3, Jan. 2011, pp. 72-75, https://www.ijcr.info/index.php/journal/article/view/53.