Selective Diffusive Gradients in Thin Films (DGT) for the Simultaneous Assessment of Labile Sr and Pb Concentrations and Isotope Ratios in Soils.

ABSTRACT: A method using diffusive gradients in thin films (DGT) for the accurate quantification of trace-level (μg L^-1) Sr and Pb concentrations and isotope ratios [δ_SRM 987(⁸⁷Sr/⁸⁶Sr) and δ_SRM 981(²⁰⁷Pb/²⁰⁶Pb)] in labile, bioavailable element fractions in soils is reported. The method is based on a novel poly(tetrafluoroethylene) (PTFE) membrane binding layer with combined di(2-ethyl-hexyl)phosphoric acid (HDEHP) and 4,4'(5')-bis-t-butylcyclohexano-18-crown-6 (crown-ether) functionality with high selectivity for Sr and Pb (TK100 membrane). Laboratory evaluation of the TK100 DGT showed linear uptake of Sr over time (2-24 h) up to very high Sr mass loadings on TK100 membranes (288 μg cm^-2) an

SUBMITTER: Wagner S 

PROVIDER: S-EPMC9047413 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature