Sensitive distance-based paper-based quantification of mercury ions using carbon nanodots and heating-based preconcentration.

ABSTRACT: This article reports the first fluorescent distance-based paper device coupled with an evaporating preconcentration system for determining trace mercury ions (Hg²⁺) in water. The fluorescent nitrogen-doped carbon dots (NCDs) were synthesized by a one-step microwave method using citric acid and ethylenediamine. The fluorescence turn-off of the NCDs in the presence of Hg²⁺ was visualized with a common black light, and the distance of the quenched fluorescence correlated to Hg²⁺ concentration. The optimal conditions for pH, NCD concentration, sample volume, and reaction time were investigated. Heating preconcentration was used to improve the detection limits of the fluorescent distance-based paper device by a factor of 100. Under the optimal conditions, the na

SUBMITTER: Ninwong B 

PROVIDER: S-EPMC9050213 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature