The preservation of francolite-associated sulfate in lingulid brachiopods [0.03%]
隐头腹足纲腕足动物中硫酸盐型方柱石的保存状态研究
Jordan P Todes,Jocelyn A Richardson,Liisa Lang et al.
Jordan P Todes et al.
Lingulid brachiopods - the namesake "living fossils" of Darwin - have a continuous record from the Cambrian to the present and possess phosphatic valves, rendering them largely unique among extant invertebrates. Due to their poorly understo...
Isabel Meza,Noah Jemison,Jorge Gonzalez-Estrella et al.
Isabel Meza et al.
We integrated aqueous chemistry analyses with geochemical modeling to determine the kinetics of the dissolution of Na and K uranyl arsenate solids (UAs(s)) at acidic pH. Improving our understanding of how UAs(s) dissolve is essential to pre...
Magnesium isotope analysis of olivine and pyroxene by SIMS: Evaluation of matrix effects [0.03%]
通过二次离子质谱(SIMS)分析橄榄石和辉石中的镁同位素：评估基体效应
Kohei Fukuda,Brian L Beard,Daniel R Dunlap et al.
Kohei Fukuda et al.
The performance of multi-collector secondary ion mass spectrometry (MC-SIMS) for Mg isotope ratio analysis was evaluated using 17 olivine and 5 pyroxene reference materials (RMs). The Mg isotope composition of these RMs was accurately and p...
Determination of Cr(III) solids formed by reduction of Cr(VI) in a contaminated fractured bedrock aquifer: Evidence for natural attenuation of Cr(VI) [0.03%]
污染裂隙基岩含水层中Cr（VI）还原生成Cr（III）固体的确定：Cr（VI）自然衰减的证据
Jiujiang Zhao,Tom Al,Steven W Chapman et al.
Jiujiang Zhao et al.
Hexavalent chromium Cr(VI) is toxic and can be highly mobile in many aquifer systems. Redox reactions with naturally occurring minerals and organic compounds can reduce Cr(VI) to Cr(III), forming labile Cr(III) oxyhydroxide precipitates, wh...
Effect of Bicarbonate and Oxidizing Conditions on U(IV) and U(VI) Reactivity in Mineralized Deposits of New Mexico [0.03%]
碳酸盐和氧化条件对新墨西哥矿物化沉积物中U(IV)和U(VI)反应性的影响
Sumant Avasarala,Chris Torres,Abdul-Mehdi S Ali et al.
Sumant Avasarala et al.
We investigated the effect of bicarbonate and oxidizing agents on uranium (U) reactivity and subsequent dissolution of U(IV) and U(VI) mineral phases in the mineralized deposits from Jackpile mine, Laguna Pueblo, New Mexico, by integrating ...
Reactivity of As and U co-occurring in Mine Wastes in northeastern Arizona [0.03%]
亚利桑那东北部矿山废物中As和U的共存及反应性
Johanna M Blake,Sumant Avasarala,Abdul-Mehdi S Ali et al.
Johanna M Blake et al.
The reactivity of co-occurring arsenic (As) and uranium (U) in mine wastes was investigated using batch reactors, microscopy, spectroscopy, and aqueous chemistry. Analyses of field samples collected in proximity to mine wastes in northeaste...
Determinants of blood water δ 18O variation in a population of experimental sheep: implications for paleoclimate reconstruction [0.03%]
实验羊血液中水的氧-18比率变化的影响因素及其对古气候重建的意义
Daniel R Green,Gerard Olack,Albert S Colman
Daniel R Green
Mammalian body, blood and hard tissue oxygen isotope compositions (δ 18O values) reflect environmental water and food sources, climate, and physiological processes. For this reason, fossil and archaeological hard tissues, which originally ...
Richard T Wilkin,Douglas G Beak
Richard T Wilkin
The uptake of aqueous Ni(II) by synthetic mackinawite (FeS) was examined in anaerobic batch experiments at near-neutral pH (5.2 to 8.4). Initial molar ratios of Ni(II) to FeS ranged from 0.008 to 0.83 and maximum Ni concentrations in mackin...
Simultaneously Quantifying Ferrihydrite and Goethite in Natural Sediments Using the Method of Standard Additions with X-ray Absorption Spectroscopy [0.03%]
基于X射线吸收光谱标准加入法同步定量天然沉积物中铁针铁矿和纤铁矿
Jing Sun,Brian J Mailloux,Steven N Chillrud et al.
Jing Sun et al.
The presence of ferrihydrite in sediments/soils is critical to the cycling of iron (Fe) and many other elements but difficult to quantify. Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used to speciate Fe in the sol...
In situ nanoscale observations of gypsum dissolution by digital holographic microscopy [0.03%]
数字全息显微镜观测硫酸钙的原位纳米尺度溶解过程
Pan Feng,Alexander S Brand,Lei Chen et al.
Pan Feng et al.
Recent topography measurements of gypsum dissolution have not reported the absolute dissolution rates, but instead focus on the rates of formation and growth of etch pits. In this study, the in situ absolute retreat rates of gypsum (010) cl...