Abstract
This work provides a method with application of valid techniques to extract and determinate inorganic species of antimony (Sb) for water. The procedure involves•the simultaneous accumulation of Sb(III) and Sb(V) on passive samplers like Diffusive Gradient in Thin Films (DGT) with iron (Fe) oxide gel, eliminating the risk of speciation changes due to transport and storage;•application of less concentrated acid (50mM Na2EDTA) for elution and preservation of Sb species from DGT resin;•subsequent analytical determination of inorganic species with High Performance Liquid Chromatography–Isotopic Dilution–Inductively Coupled Plasma Mass Spectrometer (HPLC-ID-ICP MS) based on determination of the isotope ratio (123Sb/121Sb) of isotopes in the samples after spiking with 123Sb enriched standard solution, reducing the effect of signal drift and matrix effect on the final value.
Highlights
S (DGT) with iron (Fe) oxide gel, eliminating the risk of speciation changes due to transport and storage; application of less concentrated acid (50 mM Na2EDTA) for elution and preservation of Sb species from Diffusive Gradient in Thin Films (DGT) resin; subsequent analytical determination of inorganic species with High Performance Liquid Chromatography
We report the first investigation of use of Fe-oxide gels in Diffusive Gradient in Thin Films (DGT) for incorporation of inorganic chemical forms of antimony, especially Sb(III), coupled with High Performance Liquid Chromatography–Isotopic Dilution–Inductively Coupled Plasma mass spectrometer (HPLC-ID-ICP MS)
The diffusion coefficients of each inorganic species, measured in laboratory using DGT devices in aqueous solution with know concentration of Sb species at pH 5 and 0.01 M, were 7.60 Æ 0.05 10À6 cm2 sÀ1 for Sb(III) and 5.23 Æ 0.02 7.60 Æ 0.05 10À6 cm2 sÀ1 for Sb(V). These values reflect the ionic characteristics of antimony species [2] and they were applied in DGT equation (Eq (2)) for Sb species determination aqueous solutions
Summary
ABSTRACT This work provides a method with application of valid techniques to extract and determinate inorganic species of antimony (Sb) for water. Isotopic Dilution–Inductively Coupled Plasma Mass Spectrometer (HPLC-ID-ICP MS) based on determination of the isotope ratio (123Sb/121Sb) of isotopes in the samples after spiking with 123Sb enriched standard solution, reducing the effect of signal drift and matrix effect on the final value. ARTICLE INFO Method name: DGT, HPLC, ICP MS, isotopic dilution Keywords: Trivalent antimony, Pentavalent antimony, Diffusive gradient in thin film, Chromatography–Inductively Coupled Plasma Mass Spectrometer, Water, Isotopic dilution Article history: Received 27 October 2015; Accepted 4 December 2015
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