Label-free heavy metal ion sensing via smartphone based app

Quantifying arsenic and mercury in aqueous media via bio-inspired gold nanoparticles modified by mango leaf extract

“…It turns out that the obtained linearity is consistent within a considerable concentration range of 1 to 20 ppb along with a regression value of ∼0.99. Following, [6][7][8][9][10][11] the limit of detection is found to be 1.5 ppb using the formula 3s/m where s and m correspond to standard error and slope of linear t, respectively. Likewise, we did estimate the sensing attributes for arsenic(III) ion.…”

“…Chitosan, a biodegradable biopolymer, is used as a reducing agent in the manufacture of gold nanoparticles. [5][6][7][8][9][10][11] These environmentally benign, biochemically mediated gold nanoparticles can be utilized to nd heavy metals in aqueous medium.…”

“…The most dangerous and harmful ions are mercury(II) and arsenic(III), whose consumption can lead to a variety of health issues, including brain damage, kidney failure, skin cancer, nervous system issues, etc. [6][7][8] Mercury and arsenic concentrations in water are permitted to be no more than 6 ppb and 10 ppb, respectively as per the World Health Organization's guidelines. [8][9][10] Monitoring metal ions in water has become a difficult task for the scientic community because of the increased application of heavy metal ions in industrial domains.…”

“…For the detection of arsenic(III) using a colorimetric method, functionalized gold nanoparticles, S-layer functionalized gold nanoparticles, aptamer and gold nanoparticles, aptamer conjugated silver nanoparticles, and citrate capped gold nanoparticles have all been described. [5][6][7] Meanwhile, colorimetric detection of mercury(II) utilizing silver and gold nanoparticles has also been reported. [10][11][12] It has been shown that most of the investigators used the chemical reduction method to create nanoparticles, which involves the use of rigorous chemical reagents such as sodium borohydride or trisodium citrate.…”