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Citation: WANG Xiao-Gang, LIU Wang-Zhuan, WU Qing-Sheng, DING Ya-Ping, FAN Ya-Juan. Simultaneous Determination of Naphthol Isomers under the Enhancement of Surfactant with Electrochemical Method[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 996-999. shu

Simultaneous Determination of Naphthol Isomers under the Enhancement of Surfactant with Electrochemical Method

1.
a Department of Chemistry, Tongji University, Shanghai 200092;
2.
b Department of Chemistry, Shanghai University Shanghai

Corresponding author: WANG Xiao-Gang,
Received Date: 10 October 2006
Available Online: 5 January 2007
Fund Project: 国家自然科学基金(20471042) (20471042)教育部博士点基金(20040247045)资助项目 (20040247045)

A fast and convenient analytical technique was suggested to detect naphthol isomers directly and simultaneously. In 0.1 mol/L sodium phosphate buffer solution(pH=8.0), the electrochemical behaviors of 1-naphthol and 2-naphthol were investigated with differential pulse voltammetry method at the glassy carbon electrode. Each of them exhibited an irreversible oxidation peak, and the two oxidation peaks overlapped partly in the base, meaning that the presence of 1-naphthol would interfere with the determination of 2-naphthol. Via semi-derivative technique, the two oxidation peaks were separated completely and did not overlap any more. Meanwhile, the surfactant of cetyl pyridinium chloride(CTAB) was used to enhance the detection sensitivity. The semi-derivative oxidation currents of 1-naphthol and 2-naphthol increased 2.2 and 1.9 times respectively in the presence of 1.2×10^-4 mol/L of CTAB. The enhancement mechanism of surfactant was also studied, and both 1-naphthol and 2-naphthol were detected simultaneously. The linear calibration ranges were 9.2×10^-7 to 2.0×10^-4 mol/L for 1-naphthol and 1.3×10^-6 to 2.0×10^-4 mol/L for 2-naphthol, and with detection limits of 3.2×10^-7 and 4.3×10^-7 mol/L, respectively. The reproducibility and interference tests were performed. This method was also applied to the determination of naphthol isomers in simulated water samples, and the recovery was from 97.7% to 104.0%.
- naphthol isomer,
- simultaneous determination,
- surfactant,
- semi-derivative voltammetry
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