Coprecipitation with tin(IV) hydroxide followed by removal of tin carrier for the determination of trace heavy metals by graphite-furnace atomic absorption spectrometry

✍ Scribed by Masataka Hiraide; Zou-Sheng Chen; Kohziro Sugimoto; Hiroshi Kawaguchi

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 390 KB
• Volume: 302
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00427-n

✦ Synopsis

Nanogram amounts of trace heavy metals are quantitatively coprecipitated with tin( IV) hydroxide at pH 5-6. After centrifugation, the precipitate is dissolved in nitric acid and the solution is allowed to stand overnight to form stannic acid. More than 90% of tin is precipitated, leaving trace heavy metals in the solution. The formation of stannic acid is highly accelerated by heating at 50°C. The trace heavy metals are successfully determined by graphite-furnace atomic absorption spectrometry without any interference from tin. The proposed method has been applied to the analysis of high-purity magnesium metal and river water.