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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 7
BKCSDE 29(7)
July 20, 2008 

Electrochemistry and Determination of 1-Naphthylacetic Acid Using an Acetylene Black Film Modified Electrode
Wensheng Huang*, Wanyun Qu, Dazhai Zhu
Acetylene black (AB), Film modified electrode, 1-Naphthylacetic acid (NAA), Determination
The acetylene black (AB) was dispersed into water in the presence of dihexadecyl hydrogen phosphate (DHP) via ultrasonication, resulting in a stable and well-distributed AB/DHP suspension. After evaporation of water, an AB/DHP composite film-modified electrode was prepared. The electrochemical responses of K3[Fe(CN)6] at the unmodified electrode, DHP film-modified electrode and AB/DHP film-modified electrode were investigated. It is found that the AB/DHP film-modified electrode possesses larger surface area and electron transfer rate constant. Furthermore, the electrochemical behaviors of 1-naphthylacetic acid (NAA) were examined. At the AB/DHP film-modified electrode, the oxidation peak current of NAA remarkably increases. Based on this, a sensitive and convenient electrochemical method was proposed for the determination of NAA. The linear range is in the range from 4.0 × 10?8 to 5.0 × 10?6 mol L?1, and the detection limit is 1.0 × 10?8 mol L?1. Finally, this new sensing method was employed to determine NAA in several soil samples.
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