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      Selective colorimetric detection of Cr(iii) and Cr(vi) using gallic acid capped gold nanoparticles

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          Abstract

          A colorimetric assay is proposed for the selective detection of Cr( iii) and Cr( vi) via the aggregation-induced color change of gallic acid capped gold nanoparticles (GA-AuNPs).

          Abstract

          A colorimetric assay is proposed for the selective detection of Cr( iii) and Cr( vi) via the aggregation-induced color change of gallic acid capped gold nanoparticles (GA-AuNPs). The AuNPs are characterized using UV-vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and Fourier-transform infrared spectrometry (FT-IR). To detect Cr( iii) and Cr( vi) coexisting in a sample, citrate and thiosulfate were applied to mask Cr( vi) for the detection of Cr( iii), and ethylenediaminetetraacetic acid disodium salt (EDTA) was applied to mask Cr( iii) for the detection of Cr( vi). At optimized experimental conditions, the selectivity of these AuNPs-based detection systems is excellent for Cr( iii) and/or Cr( vi) compared with other types of metal ions. The limit of detections (LODs) of a mixture of Cr( iii) and Cr( vi), Cr( iii) and Cr( vi) by eye vision are 1.5, 1.5 and 2 μM, respectively, and those by UV-vis spectroscopy are 0.05, 0.1 and 0.1 μM, respectively. The minimum detectable concentrations for Cr( iii) or Cr( vi) are all below the guideline value set by the US Environmental Protection Agency (EPA). The applicability of the AuNPs-based colorimetric sensor is also validated by the detection of Cr( iii) and Cr( vi) in electroplating wastewater and real water samples with high recoveries.

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          Selective Colorimetric Detection of Polynucleotides Based on the Distance-Dependent Optical Properties of Gold Nanoparticles

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            Mechanisms of chromium toxicity, carcinogenicity and allergenicity: Review of the literature from 1985 to 2000

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              Toxicity and carcinogenicity of Cr(VI) in animal models and humans.

              M Costa (1997)
              The toxicity and carcinogenicity of hexavalent chromium (Cr) in animal and human models are reviewed. The focus of this review is not on the well-established fact that hexavalent Cr compounds of low and high water solubility can induce respiratory cancers, but rather this review addresses other types of cancers induced by exposure to hexavalent Cr compounds. Additionally, non-cancer endpoints are also discussed with documentation of human and animal studies showing non-cancer health effects of hexavalent Cr exposure on the respiratory system, GI system, immune system, liver, and kidney. There is an emerging understanding that because hexavalent chromate is isostructural with phosphate and sulfate, it is readily taken up by the G.I. tract and penetrates to many tissues and organs throughout the body. This is supported by animal studies and experiments using human volunteers. From the epidemiological studies, there is suggestive evidence that hexavalent Cr causes increased risk of bone, prostate, lymphomas, Hodgkins, leukemia, stomach, genital, renal, and bladder cancer, reflecting the ability of hexavalent chromate to penetrate all tissues in the body. A high accumulation of Cr(III) in all tissues and organs is a strong indication of the wide toxic potential of exposure to soluble hexavalent Cr in the drinking water and in the ambient environment.
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                Author and article information

                Journal
                ICHBD9
                Dalton Transactions
                Dalton Trans.
                Royal Society of Chemistry (RSC)
                1477-9226
                1477-9234
                2016
                2016
                : 45
                : 20
                : 8347-8354
                Affiliations
                [1 ]School of Chemistry and Chemical Engineering
                [2 ]Anqing Normal College
                [3 ]Anqing
                [4 ]China
                [5 ]Key Laboratory of Magnetic Materials and Devices
                [6 ]Chinese Academy of Sciences & Division of Functional Materials and Nano Devices
                [7 ]Ningbo Institute of Materials Technology & Engineering
                [8 ]Chinese Academy of Sciences
                [9 ]Ningbo
                Article
                10.1039/C5DT04099J
                9d05678a-1cf8-47b9-93c5-ab62a4854a95
                © 2016
                History

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