title: An on-site colorimetric technique for routine determination of chromium, iron and copper in bath solutions for chromium(III) conversion coating.
abstract: An on-site colorimetric technique was developed for the routine determination of chromium, iron and copper in bath solutions for the chromium(III) conversion coating. A portable colorimeter with a red-green-blue light emitting diode was used for the absorbance measurements. Iron and copper were determined as Fe(III)-thiocyanate and Cu(I)-bathocuproindisulfonate, respectively. Chromium(III) was determined simultaneously with iron or copper using green and blue light. A correction method of the matrix effect was proposed and its applicability was demonstrated. Analytical errors were within 500, 5 and 0.3 mg L(-1) for chromium(III), iron and copper, respectively.
authors.affiliation: Interdisciplinary Graduate School of Medical and Engineering Science, University of Yamanashi, Takeda, Kofu, Japan. akawakubo@yamanashi.ac.jp
authors.forename: Susumu
authors.initials: S
authors.lastname: Kawakubo
authors.forename: Katsuhisa
authors.initials: K
authors.lastname: Shimada
authors.forename: Yasutada
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Kazuya
authors.initials: K
authors.lastname: Hattori