Electrothermal Atomic Absorption Determination of Chromium in Sediments

✍ Scribed by M.J. Marqués; A. Salvador; A. Morales-Rubio; M. de la Guardia

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 106 KB
• Volume: 62
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1999.1748

✦ Synopsis

An electrothermal atomic absorption spectrometric method has been developed to determine total chromium concentration in natural sediment samples. Samples were mineralized by dry ashing at 550°C and fused at 1100°C for 30 min with lithium metaborate. Dissolved samples were injected in graphite tubes, mineralized at 1100°C, and atomized at 2600°C. Standard addition calibration made unnecessary the use of chemical modifiers. The method provided a limit of detection from 23 to 45 ng liter Ϫ1 . The relative standard deviation for chromium determination was between 3 and 14%. Results obtained for a standard reference material agree well with the certified value. A series of natural samples were analyzed by the developed procedure and also directly by neutron activation analysis without any pretreatment and comparable results were obtained by both procedures.