Thermal lens spectrometric determination of hexavalent chromium

✍ Scribed by Mateja Šikovec; Mladen Franko; Federico G. Cruz; Sidney A. Katz

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 537 KB
• Volume: 330
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(96)00175-4

✦ Synopsis

The applicability of thermal lens spectrometry (TLS) for quantification and routine determination of hexavalent chromium was investigated by using a collinear dual beam thermal lens spectrometer. In aqueous solutions the LOD of 0.1 ug 1-l was obtained for Cr(V1) by using 160mW laser power. The performance of the technique was verified by the determination of hexavalent chromium in standard reference water samples (MST SRIvI 1643a and NIST SF&I 1643~) and comparing the results for Cr(VI) in CCA (Cr. Cu, As)-treated timber extracts to concentrations obtained by atomic absorption spectrometry (AAS). Good agreement between the TLS results and reported values for Cr(V1) in SRMs as well as AAS results for Cr(VI) in CCA-treated timbers confirmed that TLS is a reliable and accurate analytical technique applicable for the determination of Cr(VI) in aqueous solutions at concentration levels OS-100 ug 1-l.