Quantification of thallium in rocks and meteorites by graphite furnace atomic absorption spectrometry

✍ Scribed by Xun Guo; Maki Hoashi; Robert R. Brooks; Roger D. Reeves

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 412 KB
• Volume: 266
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85287-g

✦ Synopsis

A procedure was developed for the quanhficatlon of thalbum at the ultratrace level (ng g-l) m geoloacal matenals The sample 1s dissolved m 3 M H2S04 to which IS added KI and K,HP04 The thalhum IS then extracted as its mdo complex mto methyhsobutyl ketone (MIBK), leavmg behind most of the n-on The remamder of the iron IS removed from the organic layer by back-extra&on mto 3 M H,SO, The added K,HPO, enhances the extraction of thalhum mto the MIBK layer which 1s then analysed by graphite furnace atonuc absorption spectrometry The hnut of detection (30) was about 2 ng g-' m the ongmal sobd sample, though this could be reduced by further multiple loadmgs Precmon and accuracy were determmed by analysts of the standard reference rocks G-l, W-l and CAAS Sulphlde Ore The precmon ranged from 3 03-10 5% dependmg on the thalhum content of the rocks, and the relative error (accuracy) ranged from 2 l-6 7%