K. Miyaishi, T. Imasaka, N. Ishibashi
Mar 1, 1981
Citations
0
Influential Citations
44
Citations
Journal
Analytica Chimica Acta
Abstract
Thermal lensing spectrophotometry is applied to the determination of iron(II) with 4,7-diphenyl-1,10-phenanthroline disulfonic acid in aqueous solution, and in chloroform by ion-pair extraction with trioctylmethylammonium chloride. A phase-sensitive detection system with digital processing was used, the optimum modulation frequency being 5–10 Hz. A baseline drift of 0–03% was achieved. In water, the enhancement factor (sensitivity relative to conventional spectrophotometry) was 70 at an exciting power of 800 mW, and 2 × 10-9 M iron(II) was determined. In chloroform 2 × 10-10 M iron(II)—complex could be detected, the enhancement factor being 1200.