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International Conference on

Recent Trends in Environmental Sustainability

ESCON22/NMsB/35
A combination approach using two functionalized magnetic nanoparticles for speciation
analysis of inorganic arsenic

b,
a
a
c
a,
Faisal Faiz , Jun-qin Qiao , Hong-zhen Lian *, Li, Mao *, Xiao-bing Cui
a State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry &
Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing
210023, China.
b Ministry of Education (MOE) Key Laboratory of Modern Toxicology, School of Public
Health, Nanjing Medical University, Nanjing 211166, China
c College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
Correspondence: hzlian@nju.edu.cn, maoli@njmu.edu.cn

Abstract
Mercapto- and amino-functionalized magnetic nanoparticles, Fe3O4@SiO2@MPTMS
(SMNPs-MPTMS) and Fe3O4@SiO2@APTES (SMNPs-APTES), have been applied as
magnetic solid-phase extraction (MSPE) sorbents to directly extract arsenite (As(III)) and
arsenate (As(V)) respectively, followed by inductively coupled plasma-mass spectrometry
(ICP-MS) detection. Various MSPE parameters were optimized including dose of magnetic
adsorbent, pH of sample solution, loading and elution conditions of analytes, adsorption
capacity and reusability of SMNPs-MPTMS and SMNPs-APTES for As(III) and As(V)
respectively. Under the optimized MSPE conditions, this combined scheme possesses excellent
selectivity and strong anti-interference ability without any oxidation or reduction prior to
capture of these two species. It is found that with a 25-fold enrichment factor, the limits of
-1
detection of As(III) and As(V) were 23.5 and 10.5 ng L , respectively. To verify the reliability
of the proposed protocol, a certified reference material of environmental water was analyzed,
and the results for inorganic arsenic species were in close agreement with the certified values.
The applicability of the combination strategy for speciation analysis of inorganic arsenic was
evaluated in spiked tap, river, lake and rain water samples. Good recoveries of 89%-96% and
90%-102% were achieved for As(III) and As(V), respectively, with the relative standard
deviation ranges of 3.2%-8.0% and 2.5%-7.6%. Through the characterization of functionalized
magnetic nanoparticles and the optimization of MSPE experiment, it is confirmed that the
existence of mercapto and amino groups on SMNPs-MPTMS and SMNPs-APTES sorbents
are responsible for the extraction of As(III) and As(V), respectively, via coordination and
electrostatic interactions.
Keywords: arsenic, nanoparticles

Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus

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