[Study and determination of trace Fe (III) with resin-phase spectrophotometry in Mongolian medicine].
Under the buffer medium of HAc-NaAc of pH = 6.00, Fe(III) and 4-(5-chloro-2-pyridylazo)-1, 3-Diaminobenzene form a colored complex which can be quantitatively absorbed on the strong acid cation exchange resin, and the amount of trace Fe(III) is determined by spectrophotometry. The maximum absorption wavelength is at 540 nm, the apparent molor absorptivity is 1.35 x 10(5) L.mol-1.cm-1. The Beer's law is obeyed in the range of 0-18 micrograms.25 mL-1 for Fe(III). The proposed method has been applied to the determination of trace Fe(III) in mongolian medicine with satisfactory results.
Bao-Di
Department of Chemistry, Inner Mongolia Normal University, Hohhot 010022, China.
Sa-Ren
Li
Jing-feng
JF
Ga-Ri-di
D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D007501:Iron / Q000032:analysis*; D010655:Phenylenediamines; D013053:Spectrophotometry / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013059:Spectrum Analysis, Raman / Q000379:methods
D004365:Drugs, Chinese Herbal; D010655:Phenylenediamines; D007501:Iron