Critical Comparison between Modified Monier-Williams and Electrochemical Methods to Determine Sulfite in Aqueous Solutions

Table 4

Technique	LOD	Concentration range	Method	Reference
DPV	0.3 uM	0.6–100 μM	Oxidation of sulfite by ferrocenedicarboxylic acid modified multiwall carbon nanotube paste electrode	[10]
Flow injection analysis (FIA)	0.4 mg/L	0.5−50 mg L^−1	Pervaporation-Flow injection with amperometric detection (Cooper hexacyanoferrate-carbon nanotube modified carbon paste electrode)	[12]
Amperometry	1.58 mg/L 47.5 μM	3.85–33.8 mg L^−1	Reduction of bisulfite by iron aminopolypyridyl conducting-glassy carbon modified electrode	[11]
Cyclic voltammetry	1.26 mg/L	0.4−70 mg L^−1	Reduction of SO2 by porphyrin-nafion/composite modified glassy carbon electrode	[13]
DVP using standard addition	7.2 mg/L	10−40 mg L^−1	Oxidation of sulfite at glassy carbon electrodes	This work