Development of analytical method for rhodium in aquatic environment and elucidation of its behavior

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14555
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 17020:Atmospheric and hydrospheric sciences-related
• Research Institution: Kanazawa University
• Principal Investigator: Mashio Asami 金沢大学, 物質化学系, 助教 (50789485)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ロジウム / キレート樹脂 / 固相抽出 / 淡水

Outline of Final Research Achievements

A method for analyzing rhodium in environmental water was developed. By using CRB-05 as the chelating resin for solid-phase extraction and applying 0.0005 M AcOH as the adsorption solvent in the sample solution, an adsorption rate of about 98% was obtained. At low concentration of acetic acid, protonation of functional groups in the resin could be suppressed, and reactivity was increased by bidentate coordination between acetic acid and rhodium. In addition, a recovery rate of about 97% was obtained by using 2 M or more AcOH as the eluent. Therefore, a sufficient pre-concentration method could be established, albeit at the laboratory level.

Free Research Field

水圏化学、分析化学

Academic Significance and Societal Importance of the Research Achievements

外洋における元素の分布や挙動に関する研究は多数行われており、主要元素のみならず、鉄や亜鉛などの微量金属元素の分布や挙動が報告されている。しかし、Rhについては、これまで分析方法の確立の目途すらたっていなかった。本研究では今まで確立できていなかった環境水中に含まれるRhを定量する分析方法を開発できた。今後本分析法を用いて全球的に分析することで、Rhの地球化学的挙動が明らかになるとともに、人為的影響によるRh汚染がどの程度拡散しているかの知見を得ることができる。