Precise and accurate d66/64Zn data for environmental reference materials (RMs) including rocks, sediments, soils and plants are presented in order to improve the metrological traceability and analytical control of Zn isotope ratio determinations in future environmental studies. Previously developed ion exchange chromatography protocols were adjusted to enable faster sample throughput and instrumental mass bias processes were investigated. The improved chromatographic protocol yielded precise and quantitative recoveries (99 ± 7%, σ, n = 16), while the mass bias correction using Cu as external dopant provided precisions better than 0.02‰, 2σ, n = 7. Investigations into spectral and non-spectral interferences identified significant formation of Cr and Ti oxides and hydroxide ionic species. Analysis of six RMs (BHVO-2 basalt (USGS), BCR-2 basalt (USGS), AGV-2 andesite (USGS), 2709 San Joaquin soil (NIST), 1646a estuarine sediment (NIST) and 1573a tomato leaves (NIST)) showed good reproducibility (< 0.01‰, 2s, 5 ≤ n ≥ 1).

O solo de várzea exerce um importante controle sobre os ciclos de arsênio e antimônio em ecossistemas de produção de arroz por meio de adsorção a partir da fase aquosa. Realizou-se um estudo de laboratório para avaliar a adsorção e o possível comportamento competitivo desses dois elementos contaminantes.

Paddy soil exerts a major control on the arsenic and antimony cycles in rice production ecosystems through adsorption from the aqueous phase. A laboratory study was conducted to assess the adsorption and the possible competitive behaviour of these two contaminant elements.