title: Determination of chromium(III), chromium(VI) and total chromium in chromate and trivalent chromium conversion coatings by electrospray ionization mass spectrometry.
abstract: Developed were the determination methods of Cr(VI) and Cr(III) by electrospray ionization mass spectrometry, where HCrO(4)(-) (m/z 117) and [Cr(III)(cydta)](-) (m/z 394) were measured, respectively. Moreover, total Cr was also determined by measuring [Cr(III)(cydta)](-) after reduction of Cr(VI) with ascorbic acid. Here, cydta denotes trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid. The detection limits were ca. 13 nmol/dm(3) for Cr(VI) and 56 nmol/dm(3) for Cr(III) and total Cr. The proposed methods were applied to analyze chromate and trivalent chromium conversion coatings and gave consistent results with those obtained by a diphenylcarbazide spectrophotometric method for Cr(VI) and ICP-AES for total Cr.
authors.affiliation: Department of Chemistry, Nara University of Education, Takahata-cho, Nara 630-8528, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Hotta
authors.forename: Katsuya
authors.initials: K
authors.lastname: Yata
authors.forename: Kamurul Fakir Bin
authors.initials: KF
authors.lastname: Kamarudin
authors.forename: Shota
authors.initials: S
authors.lastname: Kurihara
authors.forename: Kin-Ichi
authors.initials: K
authors.lastname: Tsunoda
authors.forename: Natsuo
authors.initials: N
authors.lastname: Fukumoto
authors.forename: Isao
authors.initials: I
authors.lastname: Kojima
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Kinugasa