Effects of Centrifugation Speed on Measurements of Thallium in Sediment Pore Water
Effects of Centrifugation Speed on Measurements of Thallium in Sediment Pore Water
复制标题
离心速度对沉积物孔隙水中铊测量的影响
DOI：
10.1080/03067319708026274
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Lechner
中科院分区：
文献类型：
--
作者：
J. Azcue;V. Cheam;J. Lechner
摘要 孔隙水回收率随离心速度的加快而增加。以 1.000 rpm 离心后，从表面和 20 cm 沉积深度回收了 36% 至 17% 的总孔隙水。在 20,000 rpm 离心后，由于沉积物压实和孔径减小，约 30% 的孔隙水未被回收。这项研究的结果表明，沉积物孔隙水可分为三个部分：自由孔隙水、截留孔隙水和束缚孔隙水。铊 (Tl) 的浓度在每个孔隙水部分中显着不同，并且随着离心速度的增加而增加。沉积物低速离心（<4,000 rpm）和原位透析在沉积物孔隙水中产生类似的 Tl 浓度，对应于游离部分。在研究微量元素的通量和迁移时，通过不同离心速度获得的孔隙水数据可能会显着不同，从而造成严重的环境后果。
Abstract Pore water recovery increases directly with the speed of centrifugation. After centrifugation at 1.000 rpm, a range of 36 to 17% of total pore water was recovered from the surface and at 20 cm sediment depth. After centrifugation at 20,000 rpm, about 30% of pore water remained unrecovered due to sediment compaction and pore size reduction. The results of this study indicate that sediment pore water can be divided in three fractions, free-, trapped-, and bound-pore water. The concentration of thallium (Tl) is significantly different in each pore water fraction and increases with increasing centrifugation speed. Centrifugation of the sediments at low speed (<4,000 rpm) and in situ dialysis yield similar concentrations of Tl in sediment pore water, corresponding to the free-fraction. Pore water data obtained by different centrifugation speeds may be significantly different with serious environmental consequences when studying fluxes and transport of trace elements.