Selective Detection of Sub-hundred Picomolar Mercuric Ion in Aqueous Systems by Visible Spectrophotometry Using Gripe Water Functionalized Gold Nanoparticles
- 20 Downloads
A selective and sensitive spectrophotometric determination of Hg2+ was designed based on gripe water functionalized gold nanoparticles (AuNP). Gripe water was employed as both a reducing and a stabilizing agent for the synthesis of gold nanoparticles. The sugar moieties of gripe water were responsible for the reduction of auric ions to Au and the resultant nanoparticles possessing an average particle size of 16 nm were highly stable over a period of 1 year. The gripe water-functionalized gold nanoparticle system was highly sensitive in detecting Hg2+ ions in aqueous medium, with the limit of detection being as low as 0.05 nM. It was also highly selective of mercury even in presence of eleven different commonly associated cations. The efficacy of the nanoparticle sensor system in the analysis of mercury in real-time samples such as bottled, tap, lake and river water has also been evaluated to be good.
KeywordsGripe water Gold nanoparticle sensor Amalgam Mercury Spectrophotometric determination
The authors are thankful to Department of Science and Technology and University Grants Commission, Government of India for the sponsored analytical facilities at the Department of Chemistry, Anna University, Chennai through DST-FIST and UGC-SAP schemes. Ms. R. Anitha is thankful to DST, New Delhi for providing Junior Research Fellowship (JRF) under DST-PURSE scheme (DST Ref. No: 9500/PD2/2014). The authors acknowledge the help rendered by Dr. E. Kirubha and Dr. S. Pugazhendhi with respect to discussions on earlier report and characterization of materials.
Compliance with Ethical Standards
Conflict of interest
There are no conflicts to declare.
- 1.WHO, Mercury and Health Fact Sheet (WHO: Geneva, 2016). Accessed from http://www.who.int/mediacentre/factsheets/fs361/en/.
- 2.U.S. Environmental Protection Agency, National Primary Drinking Water Standards, EPA, 816-F-01–007, EPA, Washington, DC (2001).Google Scholar
- 27.V. K. T. Ngo, D. G. Nguyen, T. P. Huynhand, and Q. V. Lam (2015). Nanosci. Nanotechnol. 7, 035016.Google Scholar
- 42.I. Chanda, R. Bordoloi, D. D. Chakraborty, P. Chakraborty, and S. R. C. Das (2017). J. Appl. Pharm. Sci. 7, 081–084.Google Scholar