کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910967 | 1637935 | 2018 | 53 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molybdenum isotope fractionation during adsorption to organic matter
ترجمه فارسی عنوان
تجزیه ایزوتوپ مولیبدن در طول جذب به مواد آلی
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کلمات کلیدی
O horizonIHANon-traditional stable isotopesOrganic horizon - افق آلیMolybdenum isotopes - ایزوتوپهای مولیبدنTemperate forest - جنگل معتدلSoil - خاکAtmospheric deposition - رسوبات جویorganic matter - ماده آلیOregon Coast Range - محدوده ساحلی اورگانmean annual precipitation - میانگین بارندگی سالانهmap - نقشه
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Organic matter is of emerging interest as a control on molybdenum (Mo) biogeochemistry, and information on isotope fractionation during adsorption to organic matter can improve interpretations of Mo isotope variations in natural settings. Molybdenum isotope fractionation was investigated during adsorption onto insolubilized humic acid (IHA), a surrogate for organic matter, as a function of time (2-170â¯h) and pH (2-7). For the time series experiment performed at pH 4.2, the average Mo isotope fractionation between the solution and the IHA (Î98Mosolution-IHA) was 1.39â° (±0.16â°, 2Ï, based on 98Mo/95Mo relative to the NIST 3134 standard) at steady state. For the pH series experiment, Mo adsorption decreased as pH increased from 2.0 to 6.9, and the Î98Mosolution-IHA increased from 0.82â° to 1.79â°. We also evaluated natural Mo isotope patterns in precipitation, foliage, organic horizon, surface mineral soil, and bedrock from 12 forested sites in the Oregon Coast Range. The average Mo isotope offset observed between precipitation and organic (O) horizon soil was 2.1â°, with light Mo isotopes adsorbing preferentially to organic matter. Fractionation during adsorption to organic matter is similar in magnitude and direction to prior observations of Mo fractionation during adsorption to Fe- and Mn- (oxyhydr)oxides. Our finding that organic matter influences Mo isotope composition has important implications for the role of organic matter as a driver of trace metal retention and isotopic fractionation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 222, 1 February 2018, Pages 584-598
Journal: Geochimica et Cosmochimica Acta - Volume 222, 1 February 2018, Pages 584-598
نویسندگان
E.K. King, S.S. Perakis, J.C. Pett-Ridge,