Rapid visual detection of aluminium ion using citrate capped gold nanoparticles

Abstract

We report the visual detection of Al(3+) using unlabeled gold nanoparticles (AuNPs) based on the complexation of Al(3+) with citric acid, resulting in the aggregation of AuNPs. The distinction of color change can be observed by the naked eye at concentrations down to 1.0 μM which is lower than the permissable level (7.4 μM) for drinking water as defined by the World Health Organization.

Colorimetric detection of chromium(III) using O-phospho-l-serine dithiocarbamic acid functionalized gold nanoparticles

“…On the other hand, the removal of the analyte results in the redispersion of the aggregated AuNPs, causing the color change from blue to red. The distance-dependent SPR absorption of AuNPs has become a useful tool for the development of colorimetric sensing of various analytes, such as metal ions [8][9][10][11][12][13][14][15][16][17][18], anions [19][20][21][22], and biomolecules [23][24][25].…”

A portable lab-on-a-chip system for gold-nanoparticle-based colorimetric detection of metal ions in water

“…We 25 and others 21 have experimentally demonstrated that the selectivity of the Pb 2þ and Al 3þ assays is sufficient to eliminate the interference of other metal ions possibly existing in water. In a previous study, 25 and Al 3þ in tap water samples, and investigating chemical routes to minimize the effect of other potential interfering ions and compounds in the samples.…”

“…[21][22][23] AuNP is particularly suitable for use in optical sensing because its optical and chemical properties are readily tunable through adjusting its size, shape, concentration in solution, surface chemistry, and aggregation state. 24 A common paradigm of using AuNPs for detection of metal ions is based on the metal-ion-induced aggregation of AuNPs in solution and the resultant change in the solution's absorbance spectrum.…”

“…GSH itself can bind with AuNPs and cause weak aggregation; with the presence of Pb 2þ , the aggregation will be significantly magnified. For detecting Al 3þ , we adopted a previously reported approach that involves citrate-capped AuNPs 21 for Al 3þ induced aggregation. Compared with other ions, Al 3þ has a much higher stable constant for citrate binding.…”

Citrate and Polyvinylpyrrolidone Stabilized Silver Nanoparticles as Selective Colorimetric Sensor for Aluminum (III) Ions in Real Water Samples

“…The proposed silver-nanoparticles-based sensor WAS successfully used for detecting Al(III) in real water samples.Materials 2020, 13, 1373 2 of 15 aluminum ions through which Al(III) enters the human food chain; plant roots are also adversely affected by the release of Al(III) ion from the acidic soil [11][12][13].Considering the strong impact of aluminum on human health and the environment, Al(III) detection is important. Analytical techniques commonly used for detecting metal ions include ion selective electrodes [14], electrochemical methods [15], atomic absorption and emission spectrometry [16,17], and colorimetric sensors [18,19].Metallic nanoparticles were proposed as colorimetric sensors for numerous metal ions in different kind of samples. Gold nanoparticles (AuNPs) as well as silver nanoparticles (AgNPs) have been used for these purposes [20][21][22][23][24][25][26].…”