Evaluation of isotope dilution and electrothermal vaporization (ETV) introduction system for the multielemental determination in fertilizers via DRC-ICP-MS using CH3F as a reaction gas

• Grant number: 16/07749-5
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: September 01, 2016
• End date: July 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Ana Rita de Araujo Nogueira
• Grantee: Raquel Cardoso Machado
• Supervisor: Martín Resano Ezcaray
• Host Institution: Embrapa Pecuária Sudeste. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). São Carlos , SP, Brazil
• Institution abroad: Universidad de Zaragoza, Spain
• Associated to the scholarship: 13/26672-5 - Development of procedures to As, Ba, Cd, Cr, Pb and Si determination in fertilizer samples by using microwave inductive plasma optical emission spectrometry (MIP OES), BP.DR

Abstract

The analysis of fertilizers by inductively coupled plasma mass spectrometry (ICP-MS) can be affected by the complex composition of the matrix, which may cause non-spectral and spectral interferences and, consequently, impairs accuracy and precision. In this context, dynamic reaction cell (DRC) with methyl fluoride (CH3F) as reaction gas and electrothermal vaporization (ETV) have been used as alternatives to overcome spectral interferences. On the other hand, to compensate for non-spectral interferences, isotope dilution (ID) has demonstrated its possibilities. Thus, the goal of this project is to evaluate the combination of ID and DRC-ICP-MS, whenever feasible, for the determination of As, Cd, Cr, Hg, Ni and Pb in the analysis of liquid and slurry fertilizer samples. ETV will also be evaluated as sample introduction system for direct solid and slurries sampling aiming at the quantification of the same elements by means of DRC-ICP-MS. (AU)