Hg2+ detection using a disposable and miniaturized screen-printed electrode modified with nanocomposite carbon black and gold nanoparticles
- 859 Downloads
A miniaturized screen-printed electrode (SPE) modified with a carbon black-gold nanoparticle (CBNP-AuNP) nanocomposite has been developed as an electrochemical sensor for the detection of inorganic mercury ions (Hg2+). The working electrode surface has been modified with nanocomposite constituted of CBNPs and AuNPs by an easy drop casting procedure that makes this approach extendible to an automatable mass production of modified SPEs. Square wave anodic stripping voltammetry (SWASV) was adopted to perform Hg2+ detection, revealing satisfactory sensitivity and detection limit, equal to 14 μA ppb−1 cm−2 and 3 ppb, respectively. The applicability of the CBNP-AuNP-SPE for the determination of inorganic mercury has been assessed in river water by a simple filtration and acidification of the sample as well as in soil by means of a facile acidic extraction procedure assisted by ultrasound.
KeywordsMercury detection Anodic stripping voltammetry Screen-printed electrode Carbon black Gold nanoparticles Soil
F.A. likes to acknowledge the Minister of Defense, Aptamer BW project for financial support. The authors thank Julian Ramirez for revising the English manuscript.
- Agency for Toxic Substances and Disease Registry (ATSDR) Substance Priority List (2015) http://www.atsdr.cdc.gov/spl/. Accessed 21 January 2016
- Han Y, Kingston HM, Boylan HM, Rahman GM, Shah S, Richter RC, Link DD, Bhandari S (2003) Speciation of mercury in soil and sediment by selective solvent and acid extraction. Anal Bioanal Chem 375:428–436Google Scholar
- Lindqvist O, Jernelöv A, Johansson K, Rodhe H (1984) Mercury in the Swedish environment, global and local sources—SNV PM 1816, Swedish Environmental Protection Agency, S-171 85 Solna, SwedenGoogle Scholar
- UNEP (2013) Global Mercury Assessment 2013: Sources, Emissions, Releases and Environmental Transport. UNEP Chemicals Branch, Geneva, SwitzerlandGoogle Scholar
- Vicentini FC, Ravanini AE, Figueiredo-Filho LC, Iniesta J, Banks CE, Fatibello-Filho O (2015) Imparting improvements in electrochemical sensors: evaluation of different carbon blacks that give rise to significant improvement in the performance of electroanalytical sensing platforms. Electrochim Acta 157:125–133CrossRefGoogle Scholar
- Welch CM, Nekrassova O, Dai X, Hyde ME, Compton RG (2004) Fabrication, characterisation and voltammetric studies of gold amalgam nanoparticle modified electrodes. Chem Phys Chem 5:1405–1410Google Scholar