Analytical procedures for determining Pb and Sr isotopic compositions in water samples by ID-TIMS

Química Nova

Universidade de São Paulo, São Paulo, Brasil¹  Souza, Solange¹  Hirata, Ricardo¹  Sato, Kei¹  Martins, Veridiana¹  Ruiz, Izabel¹  Babinski, Marly¹ 

关键词: Pb-Sr isotopes;    groundwater;    TIMS.;   

DOI  :  10.1590/S0100-40422008000700040

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Few articles deal with lead and strontium isotopic analysis of water samples. The aim of this study was to define the chemical procedures for Pb and Sr isotopic analyses of groundwater samples from an urban sedimentary aquifer. Thirty lead and fourteen strontium isotopic analyses were performed to test different analytical procedures. Pb and Sr isotopic ratios as well as Sr concentration did not vary using different chemical procedures. However, the Pb concentrations were very dependent on the different procedures. Therefore, the choice of the best analytical procedure was based on the Pb results, which indicated a higher reproducibility from samples that had been filtered and acidified before the evaporation, had their residues totally dissolved, and were purified by ion chromatography using the Biorad® column. Our results showed no changes in Pb ratios with the storage time.

【 授权许可】

Unknown