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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 14, Number 1
BKCSDE 14(1)
January 20, 1993 

Studies on the Spectrophotometric Determination and Electrochemical Behavior of Heavy Lanthanide Ions in Nonaqueous System and Heavy Metal Chelate Complexes with Bidentate Legands : (Part Ⅰ) Flow Injection Spectrophotometric Determination of Heavy Lant
Sam-Woo Kang, Chong-Min Park, Kwang-Hee Cho, Hong-Seock Han
Spectrophotometric determination of some heavy lanthanide ions by flow injection method is described. Xylenol Orange forms water soluble chelates with lanthanide ions in a tris[hydroxymethyl]-aminomethane-buffered medium having pH 8.3 and containing cetyltrimethylammonium bromide. The molar absorptivities of Ln(Ⅲ)-XO complexes were increased by the ternary system with cetyltrimethylammonium bromide with the concomitant bathochromic shift of absorption maxium compared to those of the binary system without cetyltrimethylammonium bromide. The calibration curves are linear in the range 0.25-1.00 ppm for Gd(Ⅲ), Dy(Ⅲ), Er(Ⅲ), Tm(Ⅲ) and Yb(Ⅲ) and the dynamic range are very wide. The detection limits (S/N=2) are from 2 ppb for Gd(Ⅲ) to 30 ppb for Yb(Ⅲ) and the relative standard deviations are from 1.2% for 0.5 ppm Gd(Ⅲ) to 1.8% for 0.5 ppm Yb(Ⅲ). The sample throughput was ca. 50 h-1.
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