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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 15, Number 12
BKCSDE 15(12)
December 20, 1994 

Determination of Ultratraces of Rhodium by Adsorptive Stripping Voltammetry of Formaldehyde Complex
Tae-Kee Hong*, Myung-Zoon Czae, Chul Lee, Young-Soon Kwon, Mi-Jeong Hong
An ultrasensitive and selective stripping voltammetric scheme for the determination of rhodium is described. By the use of combined accumulation and catalytic effects in formaldehyde-hydrochloric acid medium, substantial improvement in the limit of detection can be obtained. Optimal experimental conditions were found to be 0.42 M hydrochloric acid solution containing 0.008% formaldehyde, an accumulation potential of -0.70 V (vs. Ag/AgCl) and an accumulation time of 20 s. The stripping mode was differential pulse voltammetry. In these conditions the limit of detection lies at 2 × l0-12 M (0.21 ppt). The relative standard deviation at 5 × l0-11 M was 4.9% (n=5). There were no serious interferences from other platinum group metal ions being the tolerable amounts more than 500 times that of rhodium.
1035 - 1037
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