A preliminary experimental study of the boron concentration in vapor and the isotopic fractionation of boron between seawater and vapor during evaporation of seawater |
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Authors: | Yingkai Xiao G H Swihart Yun Xiao and R D Vocke |
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Institution: | (1) Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, 810008 Xining, China;(2) Department of Geological Sciences, The University of Memphis, 38152 Memphis, USA;(3) Inorganic Analytical Chemistry Division, National Institute of Standards and Technology, 20899 Gaithersburg, USA |
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Abstract: | A laboratory experiment was undertaken to investigate the behaviour of boron at the seawater-air interface under air flow
conditions. Dried air at 25 and 35°C was passed over or bubbled through seawater at the same temperature. A combination of
ice-chilled condensers and KOH impregnated cellulose fibre filters was used to collect boron from the reacted air. When air
stripped of boron was passed over the seawater, boron was found in the reacted air, and its concentration was higher in the
higher temperature test. In the tests where air was bubbled through seawater the concentration of boron in the reacted air
was directly proportional to the air flow rate. In this situation the boron in the reacted air was mainly introduced as a
spray of microdroplets. Isotopic analysis of the collected boron in the non-bubbled tests yields fractionation factors which
demonstrate that the lighter isotope,10B, is enriched in the reacted air. The size of the fractionation changes with temperature, ruling out a purely kinetic effect. |
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Keywords: | boron isotope isotopic fractionation evaporation seawater |
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