Abstract
A colorimetric probe for determination of As(III) ions in aqueous solutions on basis of localized surface plasmon resonance (LSPR) was synthesized. The dithiothreitol molecules with two end thiols covalently combined with Au Nanorods (AuNRs) with an aspect ratio of 2.9 by Au-S bond to form dithiothreitol coated Au Nanorods (DTT-AuNRs), acting as colorimetric probe for the determination of As(III) ions. With the adding of As(III) ions, the AuNRs will be aggregated and leading the longitudinal SPR absorption band of DTT-AuNRs decrease due to the As(III) ions can bind with three DTT molecules through an As-S linkage. The potential factors affect the response of DTT-AuNRs to As(III) ions including the concentration of DTT, pH values of DTT-AuNRs, reaction time and NaCl concentration were optimized. Under optimum assay conditions, the DTT-AuNRs colorimetric probe has high sensitivity towards As(III) ions with low detection limit of 38 nM by rules of 3σ/k and excellent linear range of 0.13–10.01 μM. The developed colorimetric probe shows high selectivity for As(III) ions sensing and has applied to determine of As(III) in environmental water samples with quantitative spike-recoveries range from 95.2% to 100.4% with low relative standard deviation of less than 4.4% (n = 3).
Highlights
Arsenic (As) is an inorganic element with high toxicity and occurrence abundant in the environment samples including soil, water, food, rain and vegetations which has attracted great attention worldwide [1,2]
Many analytical methods with expensive instrumental have been applied to detect arsenic in environmental matrices, such as high performance liquid chromatography combined with inductively coupled plasma mass spectrometry (HPLC–ICP-MS) [8], hydride generation atomic
We developed a dithiothreitol (DTT) modified Au Nanorods (AuNRs) (DTT-AuNRs) as colorimetric probe for determination of As(III)
Summary
Arsenic (As) is an inorganic element with high toxicity and occurrence abundant in the environment samples including soil, water, food, rain and vegetations which has attracted great attention worldwide [1,2]. Arsenic has several oxidation states (−3, +3, 0, and +5) in the environment but in water samples it is mostly found as trivalent arsenite or pentavalent arsenate. World Health Organization (WHO) and Environmental Protection Agency (EPA) both set a provisional guideline of 133 nM (10 μg·L−1 ) for maximum arsenic content in ground water in. Several analytical methods have been established to determine the concentration of arsenic in various samples. Many analytical methods with expensive instrumental have been applied to detect arsenic in environmental matrices, such as high performance liquid chromatography combined with inductively coupled plasma mass spectrometry (HPLC–ICP-MS) [8], hydride generation atomic
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