A new simple sensitive differential pulse polarographic method for the determination of acrylamide in aqueous solution.
A new simple sensitive differential pulse polarographic (DPP) method was investigated for the determination of acrylamide (AA) directly in a neutral aqueous solution. The AA showed a well-defined and well-resolved peak in pure aqueous LiCl at -1.84V in the potential range from -1.6V to -1.97V at nitrogen pressure of 0.5kgcm(-2). Among the various electrolytes studied, the AA showed good DPP response in the presence of LiCl and tetra methyl ammonium iodide, while it showed poor response in the presence of tetra butyl ammonium hydroxide and tetra butyl ammonium bromide due to their strong adsorption on the surface of electrode which hindered its reduction. The effect of LiCl concentration, the cyclic voltammetric response and the drop time study showed that AA exhibited an irreversible adsorptive electrochemical behavior. The good electrochemical response in pure aqueous medium suggested that hydrogen bonding might be involved which may favor the electrode reaction. Under optimized conditions, the peak current was linear in the entire concentration range from 0.2 mgL(-1) to 20 mgL(-1) with the correlation coefficient of R(2)=0.9998. The method showed good reproducible results with R.S.D. of 0.3% (n=16). The detection limit (LOD) was 27 microgL(-1). The influence of various interfering agents was also studied. The method was applied successfully for the quantification of AA in water samples without any interference effect from alkali metals.
Niaz
Abdul
A
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Sindh 76080, Pakistan.
Sirajuddin
Shah
Afzal
A
Bhanger
Muhammad Iqbal
MI
Saeed
Munawar
M
Jamali
Mohammad Khan
MK
Arain
Mohammad Balal
MB
D020106:Acrylamide / Q000032:analysis*; D000327:Adsorption; D007202:Indicators and Reagents; D018021:Lithium Chloride; D011048:Polarography / Q000379:methods* / Q000592:standards; D012996:Solutions; D014867:Water
D007202:Indicators and Reagents; D012996:Solutions; D014867:Water; D020106:Acrylamide; D018021:Lithium Chloride