Determination of Dye Uptake of Malachite Green by Square Wave Voltammetry
Determination of Dye Uptake of Malachite Green by Square Wave Voltammetry
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DOI：
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发表时间：
2008
影响因子：
1.2
通讯作者：
Ma Ming
中科院分区：
文献类型：
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作者：
Ma Ming
采用循环伏安法和方波伏安法研究了孔雀石绿色在pH 1.0的硫酸溶液中的电化学行为，在CPE上发现孔雀石绿在0.82V（Pa，2）处有一个不可逆氧化峰，在0.51V（Pa，1）以及0.48 V（Pc）处的还原峰（所有vs.SCE）在0.1 V/s的扫描速率下观察到。在0.05 ~ 0.9V/s范围内，三个峰的峰电流均与扫描速率的平方根成正比，测得电极的扩散系数为2.31×10-7 cm ~ 2/s，表面覆盖率为1.18×10- 11 mol/孔雀石绿色浓度在8.00×10-6 ~ 1.0×10-4 mol/L范围内与峰电流呈良好的线性关系，检出限为6.6×10-6 mol/L（S/N=3）。孔雀石绿色染色体系中存在着染色工艺中常用的匀染剂脂肪醇聚氧乙烯醚和其它无机离子用该方法测定了染色腈纶的孔雀石绿色上染率，结果与分光光度法一致。
The electrochemical behavior of malachite green was studied at pH 1.0 of sulfuric acid solution with cyclic voltammetry and square wave voltammetry at CPE.One irreversible oxidation peak at 0.82 V(Pa,2) and a pair of quasi reversible oxidation peak at 0.51 V(Pa,1) as well as reduction peak at 0.48 V(Pc)(all vs.SCE) were observed at scan rate of 0.1 V/s.The peak currents of three peaks were all proportional to the square root of scan rate in the range of 0.05 to 0.9 V/s,which indicated that their electrode processes were diffusion-controlled.The diffusion coefficient was estimated as 2.31×10-7 cm2/s and the surface coverage was determined to be 1.18×10-11mol/cm2 by using chronocoulmetry.The peak currents of the reduction peak Pc were proportional to the concentration of malachite green in the range of 8.00×10-6-1.0×10-4 mol/L.The limit of detection was 6.6×10-6 mol/L(S/N=3).Fatty alcohol polyoxyethylene ether which was often used to be leveling agent in dying technique and other inorganic ions presented in malachite green dying system did not interfere with the determination.This method was used to determine malachite green dye uptake of dying acrylic fiber.The results were accordance with the spectrophotometric method.