NDLI: LC-ICPMS speciation of arsenite and arsenate oxyanion mixtures during their adsorption with dried sludge

Content Provider	Royal Society of Chemistry (RSC)
Author	Sánchez-Rivera, Diana Perales-Pérez, Oscar Román, Félix R.
Copyright Year	2013
Abstract	This report describes the speciation of arsenic oxyanion mixtures using a liquid chromatography coupled with inductively coupled plasma mass spectrometry (LC-ICPMS) technique. The proposed method allowed a fast, sensitive and environmentally friendly determination of arsenic inorganic species in water. The speciation was carried out during adsorption experiments using dried sludge as an adsorbent. The dried used sludge was generated as discarded material from a water plant after coagulation and sedimentation stages and was selected due to its chemical and mineralogical composition. The sludge composition includes high proportions of silica, aluminium and iron minerals, which are known to be responsible for the adsorption of arsenic species. The As speciation results demonstrated a low limit of detection (LOD) of 5.26 ppb for arsenite and 9.85 ppb for arsenate species. The arsenate species was removed faster compared to the arsenite species when both are present as mixtures. These findings confirm that electrostatic interactions between the sludge components and charged H2AsO4−, arsenate predominant species at pH 6.0, result in a faster equilibrium than H3AsO3 (arsenite, a predominantly neutral species at pH 6.0). The adsorption was fitted by Langmuir and Freundlich models; the second one being the one which better represented the adsorption process. The Freundlich parameter k, the relative uptake capacity of the adsorbent, was 0.221 (mg g−1) (L mg−1)n for arsenite and 0.101 (mg g−1) (L mg−1)n for arsenate. The data from competitive adsorption tests suggested that the removal mechanism for arsenic species is due to the formation of an outer sphere complex via electrostatic or van der Waals attractions. The results show the capability of the dried sludge as a green alternative to remove trace levels of both arsenic oxyanions from contaminated or wastewaters. Also, the developed speciation protocol allowed a better understanding of the adsorption mechanism of arsenic species by Fe-rich sludge.
Starting Page	1583
Ending Page	1589
Page Count	7
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	5
Issue Number	6
Journal	Analytical Methods
DOI	10.1039/c3ay26352e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Arsenic Oxyanion Aluminium Chromatography Silicon dioxide Van der Waals force Freundlich Adsorption Arsenate Langmuir Flocculation PH Inductively coupled plasma mass spectrometry Arsenite Speciation Langmuir adsorption model
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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