▎ 摘　　要

Arsenic (As-III), a notorious environmental hazard poses threat to the lives of several hundred million people. Notwithstanding radical developments of As-III detection in water, a fast, simple and sensitive electrochemical process with lower detection limit for the quantification of As-III in saliva and urine samples has scarcely ever been tried. Here, we have detected the poisoning due to As-III in the saliva and urine samples of tobacco-chewers/smokers using a novel one-pot synthesized MnO2/polyoxytyramine/rGO nanocomposite. The composite was characterized by various analytical techniques such as UV-Vis. and FT-IR spectroscopic analyses, XRD, SEM, TEM, EDAX and elemental mapping analyses. The proposed As-III quantification system has a wide linearity range (0.01-0.900 ppb) and the lowest detection limit (42 parts per trillion).