Simultaneous Determination of the Oxidation State of Sulfur in the Asbestos Decomposition

2014 Fiscal Year Final Research Report

• Project/Area Number: 24550103
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Analytical chemistry
• Research Institution: Saga University
• Principal Investigator: TABATA Masaaki 佐賀大学, 工学(系)研究科(研究院), 客員研究員 (40039285)
• Co-Investigator(Kenkyū-buntansha): NISHIMOTO Jun 県立広島大学, 生命環境学部, 准教授 (80253582)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: アスベスト / 常温分解 / 硫黄 / 酸化状態 / XANES

Outline of Final Research Achievements

Asbestos fibers decomposed more than 99.9 % by treating asbestos fibers with a solution prepared from sulfur and calcium hydroxide at 150°C and 0.6Mpa. In order to elucidate the mechanism oxidation state of sulfur compounds was determined by an X-ray absorption near edge structure spectrum (XANES) method. The oxidation state of sulfur gradually changed from -2 to 0, +2, +4 and +6 that depended on the treating time. The ionic radius of sulfur grows big with the oxidation. The results suggest that the sulfur compounds intercalated in asbestos fiber expand the crystal gap, leading to the decomposition of asbestos fiber under continuous mixing.

Free Research Field

分析化学