An electrochemical enrichment procedure for the determination of heavy metals by total-reflection X-ray fluorescence spectroscopy |
| |
Institution: | 2. Neurovascular Unit, Neurology Department, Vall d''Hebron Hospital, Barcelona, Spain;1. European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019 Florence, Italy;2. National Institute of Optics, National Research Council of Italy (CNR), Largo Fermi 6, 50125, Florence, Italy;3. Dipartimento di Scienze Biomediche Sperimentali e Clinche “Mario Serio”, Università degli Studi di Firenze, 50134 Florence, Italy;4. Centro Interuniversitario per lo Studio delle Malattie Neurodegenerative (CIMN), 50134 Florence, Italy |
| |
Abstract: | An electrolytic separation and enrichment technique was developed for the determination of trace elements by total-reflection X-ray fluorescence spectroscopy (TXRF). The elements of interest are electrodeposited out of the sample solution onto a solid, polished disc of pure niobium which is used as sample carrier for the TXRF measurement. The electrochemical deposition leads to a high enrichment of the analytes and at the same time to a removal of the matrix. This results in substantially improved detection limits in the lower picogram per gram region. The deposited elements are directly measured by TXRF without any further sample preparation step. The homogeneous thin layer of the analytes is an ideal sample form for TXRF, because scattered radiation from the sample itself is minimized. The proposed sample preparation method is useful particularly for the analysis of heavy metals in liquid samples with for TXRF disturbing matrices, e.g. sea water. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|