Cr(III)/Cr(VI) speciation determination of chromium in water samples by luminescence quenching of quercetin

Facile preparation of glutathione-stabilized gold nanoclusters for selective determination of chromium (III) and chromium (VI) in environmental water samples

“…The lowest detectable response was equal 3 times of the standard deviation (SD) of 7 parallel blank measurements [33]. The solution of GSH-Au NCs (2.5 mM) in the absence of metal ions was used as a blank.…”

“…This method could be considered as environmentally friendly for the use of minute amount of gold nanoclusters, and compared to some fluorimetry and colorimetry methods [33][34][35] shown in Table 2, it gives comparable or even superior LODs and wider detection range. Compared with other methods such as ETAAS [4,5], …”

Quinine doped hybrid sol–gel coatings for wave guiding and optical applications

“…It can be observed that the PL intensity increases with the quinine concentration reaching the highest intensity for sample with 12%wt and decreasing for higher concentrations. This decrease is due to a quenching for concentration (fluorescence inhibition) which appears when concentration reaches a maximum from which there is an significant self-absorption of fluorescent radiation by the solution [36]. In the inset of Fig.…”

Novel catalytic fluorescence method for speciative determination of chromium in environmental samples

“…An extensive coverage of the available methods for chromium determination was put forth by Gomez and Callao, including the various types of sample matrices selected for the determination (Gomez and Callao 2006). Reagents such as bis-[2-hydroxy-1-naphthaldehyde] thiourea (Kiran et al 2008), quercetin (Hosseini and Belador, 2009), chromotropic acid (CA) (Themelis et al 2006), bis (salicylaldehyde) orthophenylenediamine (BSOPD) (Arancibia et al 2012 andSoomro et al 2011), etc. have been used.…”