摘要
河水中所合“活性硅”量(郎用硅钼黄法能测出的硅酸根量,主要是单体和二聚体硅酸离子)较海水高得多;在河口滨海区附近一带,活性硅合量的水平梯度往往很大。究竟河水入海时,其中所合的大部分活性硅经过什么变化?向何处转移?
Samples of the water at the mouth of the Jiu-long River in Fujian were taken and analyzed for reactive silicate content.Relationship between reactive silicate content and chlorinity similar to that reported by Bien and his co-workers has been observed.The result once again confirms that the reactive silicate of the river water undergoes,when mixed with sea water,not only a simple dilution process but also a chemical or physico-chemical transformation and other types of removing process to a definite extent.It was also found that the reactive silicate content decreased gradually when un-filtered river water was mixed with de-silicated sea water in the laboratory,but practically no change was observed when using filtered river water.This gives support to Bien’s argument that suspended matter is one of the necessary conditions for the removal of silicate.Merely adding electrolytes such as NaCl,MgCl_(2),and Na_(2)SO_(4)to filtered river water or varying the pH had practically no effect on the reactive silicate content,although they might affect the color density of the solution in colorimetric determination.In the early stages of our study on the mechanism of silicate removal in the es-tuarial region,some adsorption isotherms of reactive silicate on colloidal Fe(OH)_(3)and A1(OH)_(3)were obtained.This shows that most of the reactive silicate is adsorbed by these adsorbents and that the rate of adsorption increases with increasing chlorinity.It is very probable that adsorption on the surface of suspended and colloidal particles is the first step of the mechanism.Further quantitative study is in progress.
作者
李法西
吴瑜端
王隆发
陈泽夏
LI FA-SI;WU YU-DUAN;WANG LONG-FA;CHEN ZE-HSIA(Department of Chemistry,Amoy University;East-China Institute of Oceanology)
出处
《海洋与湖沼》
1964年第4期311-322,共12页
Oceanologia Et Limnologia Sinica
