A polymeric compound of urushiol Al modified carbon paste electrode was examined for the determination of trace silver in water. In 0 1 mol/L KNO 3 and HAc NaAc solution(pH=5 5), silver is accumulated on the surface o...A polymeric compound of urushiol Al modified carbon paste electrode was examined for the determination of trace silver in water. In 0 1 mol/L KNO 3 and HAc NaAc solution(pH=5 5), silver is accumulated on the surface of the modified carbon paste electrode at -0 1 V( vs .SCE). In the following step, a sensitive oxidation peak of Ag + at 0 22 V could be observed by anodic stripping voltammetry. The peak current is linearly related to the concentration of silver ranged from 4 0×10 -9 mol/L to 2 5×10 -7 mol/L. The detection limit(signal to noise=3) is 1 5×10 -10 mol/L after 20 min accumulation, the average recovery is 100 3%.展开更多
文摘A polymeric compound of urushiol Al modified carbon paste electrode was examined for the determination of trace silver in water. In 0 1 mol/L KNO 3 and HAc NaAc solution(pH=5 5), silver is accumulated on the surface of the modified carbon paste electrode at -0 1 V( vs .SCE). In the following step, a sensitive oxidation peak of Ag + at 0 22 V could be observed by anodic stripping voltammetry. The peak current is linearly related to the concentration of silver ranged from 4 0×10 -9 mol/L to 2 5×10 -7 mol/L. The detection limit(signal to noise=3) is 1 5×10 -10 mol/L after 20 min accumulation, the average recovery is 100 3%.
