Electronic Supplementary Material
Determination of 4-aminophenylarsonic acid using a glassy carbon electrode
modified with an ionic liquid and carbon nanohorns
Hong Daia*, Lingshan Gonga, Shuangyan Lua, Qingrong Zhanga, Yilin Lia, Shupei
Zhanga, Guifang Xua, Xiuhua Lia, Yanyu Linab, Guonan Chenb
a
College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou,
Fujian 350108,China
b
Ministry of Education Key Laboratory of Analysis and Detection for Food Safety,
and Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, China
* Corresponding author, e-mail:
Fig. S1 TEM graph of CNHs.
1
Fig. S2 Bode-phase plot of IL-CNHs/GCE in 1 M KCl.
Optimization of modified components
The
electrochemical
response
of
modified
layer
to
Fe(CN)63-/4-
and
4-aminophenylarsonic acid was supposed to be influenced by amount of IL and CNHs,
which could prove by controlling using different amount of IL and CNHs but with
same volume of modified solution, and the corresponding results were present in
Fig.3S. As showing of results, with increasing of IL, both current responses of
Fe(CN)63-/4- and 4-aminophenylarsonic acid were amplified, but electrochemical
reversibility of Fe(CN)63- decreased and positive shift of oxidation peak potential,
however, when amount of IL beyond 10 mg·mL-1, current responses of Fe(CN)63-/4and
4-aminophenylarsonic
electrochemical
reversibility
acid
of
were
dramatically
Fe(CN)63-/4-
decreased,
improved
and
while,
oxidation
the
of
4-aminophenylarsonic acid tended to be easy with negative shift of oxidation peak
potential. Also, the effect of amount of CNHs was investigated, similar to IL, with
increasing amount of CNHs, current responses for both Fe(CN)63-/4- and
4-aminophenylarsonic acid were subjected to massive signal amplification,
meanwhile, oxidation of 4-aminophenylarsonic acid is easy because of oxidation peak
2
potential transferring negative shift. But the electrochemical reversibility of Fe(CN)63decreased until 3 mg·mL-1, with further increased amount of CNHs, electrochemical
reversibility of Fe(CN)63-/4- gradually improved. When modified amount of CNHs
beyond 4 mg·mL-1, the current response both Fe(CN)63- and 4-aminophenylarsonic
acid decreased. Therefore, in order to getting optimized electrochemical sensor for
detecting 4-aminophenylarsonic acid, 10 mg·mL-1 IL and 4 mg·mL-1 CNHs were
chosen to structure modified layer.
Fig. S3 The effect of modified amount of IL (A, C) and CNHs (B, D), (A) and (B)
obtained by taking points of CVs of different modified electrodes in 5 mM
K3[Fe(CN)6] at 0.1 V•s-1, (C) and (D) in 1 mM 4-aminophenylarsonic acid at 0.1
V•s-1.
3
Table
S1
Figures
of
merit
of
comparable
methods
for
determination
4-aminophenylarsonic acid.
Method
Linear range
LOD
(µM)
(µM)
Comments
Refs
A novel method based on off-line
on-column anion selective
exhaustive injection coupled
capillary
hollow fiber based liquid liquid
0.12-9.2
0.032
liquid microextraction combined
with ASEI-CE/UV detection was
electrophoresis/ultraviolet
developed for the speciation of five
High performance liquid
An effective method has been
chromatography coupled to
developed for the separation and
[1]
phenylarsenic compounds.
ultraviolet oxidation hydride
0.00046-0.0092
0.0011
determination of three
generation atomic
organoarsenic species in the food of
fluorescence spectrometry
animal tissue origin.
[2]
A new method of Titania
immobilized polypropylene hollow
fiber as a disposable coating for stir
high performance liquid
chromatography-inductively
coupled plasma mass
bar sorptive extraction combined
0.00023-0.46
0.065
with HPLC-ICP-MS for the
[3]
speciation of phenyl arsenic
spectrometry
compounds and their possible
transformation products in chicken
tissues.
A novel method of ionic liquid
based carrier mediated hollow fiber
high performance liquid
chromatography-inductively
coupled plasma mass
liquid liquid liquid microextraction
0.00018-0.092
0.046
combined with HPLC-ICP-MS for
[4]
the speciation of five phenylarsenic
spectrometry
compounds and arsenate in chicken
and feed samples.
A simple EC sensor coating with
Electrochemistry (EC)
0.5-3480
0.5
ionic liquid assisted carbon
This
nanohorns for
work
4-aminophenylarsonic acid.
4
References
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by HPLC-Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS). Food Anal
Methods 6:370-379.
3. Mao X, Chen B, Huang C, He M, Hu B (2011) Titania immobilized polypropylene
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liquid chromatography–inductively coupled plasma mass spectrometry speciation of
arsenic in chicken tissues. J Chromatogr A 1218:1-9.
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fiber liquid liquid liquid microextraction combined with HPLC-ICP-MS for the
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