Skwarzec B, Boryło A, Strumińska D
Chair of Analytical Chemistry, Faculty of Chemistry, University of Gdańsk, Sobieskiego 18/19, 80-952 Gdansk, Poland.
J Environ Radioact. 2002;61(3):345-63. doi: 10.1016/s0265-931x(01)00144-8.
The aim of this work was to determine the concentration of 234U and 238U and calculate the values of the 234U/238U activity ratio in waters and sediments from the various regions of the southern Baltic Sea: Gdańsk Deep, Słupsk Narrow and Bornholm Deep. The concentration of uranium in analysed sediments from southern Baltic increase with core depth to what probably is connected with diffusion from sediments to water through interstitial water, where uranium concentration is much higher than in bottom water. The highest concentrations of uranium were observed in sediments of Słupsk Narrow (0.66-7.11 mg kg(-1) d.w.) and Słupsk Bank (0.61-6.93 mg kg(-1) d.w.), the lowest in sediments from Bornholm Deep (0.54-3.77 mg kg(-1) d.w.). The 234U/238U activity ratio results indicated that the sedimentation of terrigenic material and Vistula River transport are the general sources of uranium in the southern Baltic sediments. The value of 234U/238U activity ratio in sediments from reduction areas from southern Baltic (Gdańsk Deep and Bornholm Deep) indicated that reduction process of U(VI) to U(IV) and removing of anthropogenic uranium from seawater to sediments constitutes a small part only in Gdańsk Deep.
这项工作的目的是测定波罗的海南部不同区域（格但斯克湾、斯武普斯克海峡和博恩霍尔姆湾）水体和沉积物中234U和238U的浓度，并计算234U/238U活度比的值。波罗的海南部分析沉积物中铀的浓度随岩芯深度增加，这可能与铀通过孔隙水从沉积物扩散到水体有关，孔隙水中铀的浓度远高于底层水。在斯武普斯克海峡（0.66 - 7.11 mg kg(-1)干重）和斯武普斯克浅滩（0.61 - 6.93 mg kg(-1)干重）的沉积物中观察到最高的铀浓度，在博恩霍尔姆湾沉积物中最低（0.54 - 3.77 mg kg(-1)干重）。234U/238U活度比结果表明，陆源物质的沉积和维斯瓦河的输送是波罗的海南部沉积物中铀的主要来源。波罗的海南部还原区（格但斯克湾和博恩霍尔姆湾）沉积物中234U/238U活度比的值表明，U(VI)还原为U(IV)的过程以及人为铀从海水向沉积物中的去除在格但斯克湾仅占很小一部分。
