ANALYSIS OF ENVIRONMENTAL FEATURES OF RED TIDE IN THE WESTERN WATERS OF XIAMEN BAY

This article reports main results of investigations on red tide in western waters of Xiamen Bay from Jan. to Dec. 1987, and elaborates on the relationship between the change of phytoplanktonic number and main environmental factors there. The cause and the method for judging and monitoring of red tide are discussed.     

含偕胺肟基和羧基纤维状吸附剂的研制及其吸铀作用

在聚丙烯腈纤维上导入偕胺肟基和羧基,制得具有高吸铀量和高吸铀速度的纤维状吸附剂,每克纤维10天能从天然海水中吸铀4.6毫克,研究了纤维吸附剂的平衡吸铀量X_m和吸铀速度常数K与基团含量的关系,发现X_m和K分别与偕胺肟基和羧基含量相关,因而得出结论:偕胺肟基为吸铀活性基团,羧基为加快吸铀速度的促进基团,同时研究了纤维对铀的吸附机理,用分子轨函观点讨论吸附态的螯合结构.     

铀酰络离子在水合氧化钛上的吸附作用——Ⅰ.化学热力学特性

本文研究了水合氧化钛在NaCl-NaHCO₃溶液和海水中对铀酰络离子吸附的热力学特性。测定吸附等温线和各种pH值的吸附密度,估算了各组分对吸附密度的贡献、吸附自由能△G_ads,i、静电吸引能△G_coul,i和化学吸附势能△G_chem,i。并且计算了平均自由能△G_ads、吸附焓变△H_ads和吸附熵变△S_ads。由此得出结论:这是一种自发的吸热的络合吸附过程。     

台湾海峡西部海域春季表观耗氧量的垂直分布及其极小值

根据1984年台湾海峡西部海域综合调查资料,分析了该海区春季表观耗氧量垂直分布的特征。结果表明,AOU垂直分布趋势为上低下高。表层均呈负值(-0.16×10~(-3)～-2.55×10~(-3)),底层1/2测站呈现负值(-0.04×10~(-3)～-2.42×10~(-3));而另1/2测站呈现正值(0～0.86×10~(-3))。AOU垂直分布有极小值的站位通常出现于不同水系的交汇带,其深度在密跃层下界附近。这是由于密跃层下界附近氧的涡动扩散进行得比热的涡动传导为慢的缘故。因而,逐渐增温时,氧来不及释放到大气中,即氧呈过饱和状态。浮游植物量对极小值的形成不起决定性作用,而只能影响极小值的大小。     

ADSORPTION OF URANYL COMPLEX IONS ON HYDROUS TITANIUM OXIDE Ⅰ. CHEMICAL THERMODYNAMICAL CHARACTERISTICS

An account is given of the thermodynamical characteristics of the adsorption of uranyl complex ions on hydrous titanium oxide (HTO) in NaCl-NaHCO3 solution and in seawater. Determined are the adsorption isotherms and the adsorption density in various pH. The contribution of each component to the adsorption density, the adsorption free energy ΔGads,t, the coulostatic energy ΔGcoul,t. and the cqemisorption potential energy Gchem. t are estimated. The average free energy ΔGads enthalpy change, ΔHads, and entropy change, ΔSads, of the adsorption in this system are -7.33 kcal/mol, 6.30 kcal/mol and 45.7 cal/mol K respectively. It is hereof concluded that the complex chemisorption process is spontaneous and thermonegativc.