Role of Fe(III) in preventing humic interference during As(III) detection on gold electrode: spectroscopic and voltammetric evidence.
A drawback of As(III) detection using square wave anodic stripping voltammetry (SWASV) is that it is susceptible to interferences from various metals or organic compounds, especially in real sample water. This study attempts to understand the interference of co-existing of Fe(III) and humic acid (HA) molecules to the electrochemical detection of As(III) using Fourier transform infrared (FTIR) spectrum and X-ray photoelectron spectroscopy (XPS). The electrochemical experiments include stripping of As(III) in the solutions containing HA with different concentrations, cyclic voltammetry in 0.5M H2SO4 in the presence of HA or Fe(III) with/without addition of Fe(III) or HA, and stripping of As(III) in the presence of HA or Fe(III) with/without addition of Fe(III) or HA. FTIR and XPS are employed to confirm the affinity of HA to Fe(III) or As(III) in acidic condition.
Nanomaterials and Environmental Detection Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China; Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
Zhong-Gang
ZG
Liu
Nanomaterials and Environmental Detection Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
Xing
X
Chen
Nanomaterials and Environmental Detection Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
Yong
Y
Jia
Nanomaterials and Environmental Detection Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
Jin-Huai
JH
Liu
Nanomaterials and Environmental Detection Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China; Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China. Electronic address: xingjiuhuang@iim.ac.cn.
Xing-Jiu
XJ
Huang
D001151:Arsenic / Q000032:analysis / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005290:Ferric Compounds / Q000737:chemistry*; D006046:Gold / Q000032:analysis / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D019216:Metals, Heavy / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared
D005290:Ferric Compounds; D006812:Humic Substances; D007202:Indicators and Reagents; D019216:Metals, Heavy; D009930:Organic Chemicals; D006046:Gold; D001151:Arsenic
As(III) detection; FTIR; Influence of HA and Fe(III); Stripping voltammetry; XPS