Arsenic quantification and speciation at trace levels in natural water samples by total reflection X-ray fluorescence after pre-concentration with -methyl--glucamine functionalized quartz supports
Total reflection X-ray fluorescence (TXRF) spectrometry is a very effective multi-elemental analytical technique for the determination of metals at ultra trace concentrations in aqueous samples. In this work a novel and simple TXRF based method has been developed for the quantification and speciatio...
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| Published in | Journal of analytical atomic spectrometry Vol. 35; no. 11; pp. 277 - 2778 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
04.11.2020
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| Online Access | Get full text |
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| Summary: | Total reflection X-ray fluorescence (TXRF) spectrometry is a very effective multi-elemental analytical technique for the determination of metals at ultra trace concentrations in aqueous samples. In this work a novel and simple TXRF based method has been developed for the quantification and speciation of arsenic (As) at ultra trace levels in water samples. The quartz supports used for TXRF measurements were functionalized by anchoring (3-glycidyloxypropyl)trimethoxysilane by the sol-gel method and subsequently reacting with
N
-methyl-
d
-glucamine (NMDG). The novelty of this work is the introduction of gold nano particles (Au-Nps) as an internal standard on the sample support itself. We have utilized
in situ
reduction of chloroauric acid to gold nanoparticles which are grafted on sites of the NMDG membrane attached to the quartz sample supports. Thus, the anchored NMDG on quartz support serves dual objectives as it binds with As(
v
) and reduces AuCl
4
−
ions to form Au nanoparticles. The As loaded quartz supports were presented for direct TXRF measurements and As determination. The TXRF determination of As species after separation resulted in speciation and quantification of As in water samples. The developed method was used for quantification and speciation of arsenic in water samples by TXRF and thus has a great societal application for the quality assessment of water samples in As contaminated areas.
A TXRF method for the speciation and determination of As at ultra-trace levels in natural water based on the use of an Au-loaded NMDG membrane immobilized on a quartz reflector for extraction. |
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| Bibliography: | pre-concentrated on NMDG modified quartz from aqueous solution in a concentration range of 0.3-50 ng mL 1 sorption to NMDG-quartz; linear calibration plot obtained using As v 10.1039/d0ja00385a sorption efficiency of the NMDG modified quartz as a function of pH of the aqueous medium; effect of aqueous sample volume on the As See DOI for TXRF measurements; table showing TXRF determination results for the total arsenic content in simulated water samples containing As(III) and As Electronic supplementary information (ESI) available: Photograph of quartz sample supports after immobilization of NMDG on their top surfaces; TXRF spectrum of the NMDG modified quartz support loaded with Au NPs; absorption spectra of the Au-loaded NMDG modified quartz support showing the surface plasmon resonance around 500-600 nm due to the formation of AuNPs; the estimated size distribution of Au NPs on the NMDG modified quartz support obtained from the image analysis of the micrograph obtained by FESEM; As |
| ISSN: | 0267-9477 1364-5544 |
| DOI: | 10.1039/d0ja00385a |