Arsenic quantification and speciation at trace levels in natural water samples by total reflection X-ray fluorescence after pre-concentration with N-methyl-d-glucamine functionalized quartz supports. Issue 11 (14th October 2020)

• Record Type: Journal Article
• Authors: Sanyal, Kaushik; Chappa, Sankararao; Bahadur, J.; Pandey, Ashok. K.; Mishra, Nand Lal
• Is Part Of: Journal of analytical atomic spectrometry. Volume 35:Issue 11(2020)
• Page Start: 2770
• Page End: 2778
• Publication Date: 2020-10-14
• Subjects: Atomic spectra -- Periodicals; Atomic absorption spectroscopy -- Periodicals; 543.0858
• DOI: 10.1039/d0ja00385a
• Languages: English
• ISSNs: 0267-9477

Abstract

Abstract : 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. Abstract : 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 AuCl4 − 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.