Accurate and precise determination of chromium by isotope dilution mass spectrometry in some environmental materials

✍ Scribed by J.G. van Raaphorst; H.M. Haremaker; P.A. Deurloo; B. Beemsterboer

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 491 KB
• Volume: 286
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)85075-5

✦ Synopsis

A method for the determination of chromium with the help of thermal ionization isotope dilution mass spectrometty was developed. In this type of mass spectrometry a stable signal depends mainly on the purity of the loaded sample. Therefore, the main effort was the development of a method for the separation of the chromium from the matrix. A separation procedure based on ion exchange is described. Two alternative thermal ionization methods were investigated. With the first one (the so-called triple filament technique) the measurable amount of chromium ranges from 10 ng to 10 pg. The second technique (a single filament technique) needs 0.1-10 pg. For economical reasons the last technique was chosen. Combined with a blank value of 0.4 f 0.2 pg and a sample intake of l-2 g the detection limit of the described method is approximately O&g/g. To test the method a number of certified reference materials were analyzed.