Simple and Equipment-Free Paper-Based Device for Determination of Mercury in Contaminated Soil.

ABSTRACT: This work presents a simple and innovative protocol employing a microfluidic paper-based analytical device (µPAD) for equipment-free determination of mercury. In this method, mercury (II) forms an ionic-association complex of tetraiodomercurate (II) ion (HgI42-(aq)) using a known excess amount of iodide. The residual iodide flows by capillary action into a second region of the paper where it is converted to iodine by pre-deposited iodate to liberate I2(g) under acidic condition. Iodine vapor diffuses across the spacer region of the µPAD to form a purple colored of tri-iodide starch complex in a detection zone located in a separate layer of the µPAD. The digital image of the complex is analyzed using ImageJ software. The method has a linear calibration range of 50-350 mg L-1 Hg with the det

SUBMITTER: Nashukha HL 

PROVIDER: S-EPMC8037038 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature