Use of unmodified silver nanoparticles (AgNPs) as colorimetric Hg(II) sensor: A new approach to sensitive and high sample throughput determination of Hg(II) under high influence of ionic suppression

Puchum, Sodsai; Meelapsom, Rattapol; Muniandy, Sunderishwary S.; Lee, Hooi Ling; Pencharee, Somkid; Amatatongchai, Maliwan; Suttisintong, Khomson; Jarujamrus, Purim

doi:10.1080/03067319.2019.1580703

Cited by 10 publications

(1 citation statement)

References 32 publications

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“…Recently, digital image-based colorimetry is receiving more attention as an alternative to the conventional methods, owing to its green, low-cost, portable and simple analytical procedure to analyze chemical compounds including metals [8][9][10][11], anions [12,13], organics [14,15], biochemical compounds [16,17] and medical applications [18][19][20]. The dynamic range of the digital image represented by red-green-blue or RGB color space (i.e., from 0 to 255), is much broader than conventional colorimetry or spectrophotometry methods (i.e., from 0 to 2.0 absorbance) providing the opportunity to improve the sensitivity of detection [8,18].…”

Section: Introductionmentioning

confidence: 99%

Smartphone Coupled with a Paper-Based Colorimetric Device for Sensitive and Portable Mercury Ion Sensing

et al. 2019

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The rapid development of information and communication technology provides an opportunity for scientists to develop a quantitative analytical method that is built on a mobile gadget as a detector. In this paper, we report a low-cost, simple and portable analytical method for mercury ion quantification based on digital image colorimetry coupled with a smartphone application. A small amount of silver nanoparticles (AgNPs) was used as a colorimetric agent that is selective only to mercury ions. The yellowish brown color of AgNPs instantly changed to colorless after the addition of mercury ions due to a redox reaction. To increase the portability, we attached the AgNPs onto a medium to create a paper-based analytical device. The final data processing of the colorimetric analysis was conducted using an android application available on the Google Play Store, called "Mercury Detector". The proposed method has good sensitivity, with a detection limit of 0.86 ppb, which is comparable to those of bulk and more expensive instruments. This allows for the detection of mercury ions as low as 2 ppb (10 nM), which is also the maximum contaminant level permitted in drinking water by the US Environmental Protection Agency. The proposed method was applied to real samples that provide satisfactory results on accuracy (2.4%) and precision (2.5%).

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