Determination of gallium in iron meteorites and other iron-rich materials 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: 449 KB
• Volume: 259
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85378-j

✦ Synopsis

A procedure was developed for the graphite furnace atomic absorption spectrometnc determmatlon of galhum m high-iron geological matenals such as iron meteontes To overcome severe interference from iron, gallium 1s extracted as a chloro complex from 5 M hydrochloric aad mto lsobutyl methyl ketone Iron IS reduced by addition of potassmm iodide and its co-extraction into the organic phase is thereby decreased to < 2% As detenmned by analysis of geological reference materials, the hmlt of detection (30) was about 0 05 pg g-' The preclslon (R S D ) ranged from 0 8 to 1 1% The accuracy, as deternuned from the relative error, ranged from 0 7 to 7 7% for the three standards analysed In solutions containing 1 pg ml-' galhum, no interferences were observed for up to 1500 pg III-~ mckel, 1200 pg ml-l copper, 200 fig ml-' cobalt, 100 pg ml-' arsemc and 200 pg ml-' germanium The method was applied to the analysis of eight iron meteorites that had been previously analysed by neutron actlvatlon analysis The mean relatwe deviation of 8 6% was satisfactory