Development of analytical method of arsenic release mechanism by selective extraction of iron oxides

2015 Fiscal Year Final Research Report

• Project/Area Number: 25340079
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Center for Environmental Science in Saitama
• Principal Investigator: Ishiyama Takashi 埼玉県環境科学国際センター, 土壌・地下水・地盤担当, 主任研究員 (80297621)
• Co-Investigator(Kenkyū-buntansha): HACHINOHE SHOICHI 埼玉県環境科学国際センター, 土壌・地下水・地盤担当, 主任研究員 (70415397) ; HAMAMOTO HIDEKI 埼玉県環境科学国際センター, 土壌・地下水・地盤担当, 専門研究員 (40511978)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 砒素 / 地下水汚染 / 鉄酸化物分別溶解法 / 砒素汚染メカニズム

Outline of Final Research Achievements

Arsenic contamination of groundwater based on natural process occurs frequently in Midwestern part of Saitama Prefecture. Chemical composition of the groundwater in this area is similar each other, and high concentration of arsenic and iron are detected under reducing conditions. In this study, arsenic release mechanism into groundwater was analyzed by using selective extraction of iron oxides in sediments. From the results of recovery test of arsenic and iron using synthetic samples, it was recognized that DC method in which sodium citrate-dithionite mixed solution is used as extracting solvent is most suitable technique for analysis of arsenic release mechanism in this area. Iron oxides are the principal source of arsenic in this area and dissolution of iron oxides under reducing conditions is a cause of release of arsenic into the groundwater.

Free Research Field

分析化学