AHMED, M. F. A., LINGAPPA, Y. and GLORY, A. (2011) “SPECTROPHOTOMETRIC DETERMINATION OF ARSENIC, LEAD IN ENVIRONMENTAL AND BIOLOGICAL SAMPLES USING 2, 5­THIOPHENE DICARBOXALDEHYDE, THIOSEMICARBAZONE”, International Journal of Chemistry Research, 2(3), pp. 72–75. Available at: https://www.ijcr.info/index.php/journal/article/view/53 (Accessed: 10 December 2025).