太古宙英云闪长岩的产生

年轻俯冲大洋板块在太古宙条件下的热演化模式表明,俯冲湿地壳内的拉斑玄武岩在浅部(50～80km深处)熔融,生成了太古宙英云闪长岩。由于融熔潜热被地壳消耗,使上覆橄榄岩地幔楔体在低于橄榄岩熔融温度的条件下得以保存下来。这可阻止地幔楔体内的熔融和在现代俯冲带中所观测到的岩石类似的钙碱性岛弧火山岩的生成。     

色散油浸法测定岩石薄片的折射率

<正> 岩石学者要获得薄片中特殊晶体的折射率(n)就需从薄片中取出矿物颗粒或将矿物从岩石标本中分离出来。前者十分麻烦,后者又很难使分离出的矿物与薄片中要测的特定颗粒相同。本文描述和评价的色散法提供了在岩石薄片中快速测定选定矿物折射率的技术。     

25、用电化学气相色谱法检测ppm和ppb级的H_2S

本文论述了H_2S的气相色谱分析用的电化学检定器,讨论了此检定器的运行特性。此检定器的运行是以测定H_2S在一个扩散电极上的电化学氧化电流为基础的。检定下限是3×10~(-12)克H_2S,精确度为0.5％,分析可在2分钟内完成。准确度主要受约于校正样品的制备和是否有标准参考气体混合物。     

瑞士格劳宾登提劳恩的同变质铀矿化

<正> 铀矿化体产于瑞士格劳宾登前莱茵河谷施兰斯村南坡脚提劳恩地区的碎屑岩中。该矿点是1962年发现的,已打了三个浅钻孔。本文报道对提劳恩铀矿点的一组标本所进行的岩石学、矿物学及 X 光研究结果。并对距其西南约1.5公里,产状相似的特伦矿点做了对比研究。特伦矿点产于塔韦茨山的变质岩中,其主要矿化年龄为303—329百万年,据认为矿化是在华力西变质作用期间的高温热液条件下,由于近矿围岩中金属的活化而形成的。     

用X射线光电子能谱(ESCA)和加热释气分析法(EGA)初步探讨北京大气飘尘中硫和氮等的化学状态

用X射线光电子能谱和加热释气分析法测定了三种北京大气飘尘中硫和氮等的主要化学状态,并结合两种不同配料蜂窝煤所得烟尘和个别煤样的电子能谱进行了初步探讨。     

大陆的起源及其早期增长速率

<正> 引言毫无疑问,大陆的成因和增长问题,在过去、现在和将来都是地质学家十分感兴趣和有争论的课题。地球化学和地球物理资料提供了大陆和地幔演化的大量边界条件。然而,其中的大多数边界条件都不是唯一的。有些边界条件似乎是相互矛盾的。特别是Nd和Pb同位     

处理工业废水的中试装置

每一个化学工程师或环境工程师都了解中试装置在新工艺的开发和应用中的历史作用及重要性。在70年代初期进行的许多废水处理中试研究为系统设计提供了设计基础,这些系统满足了美国环境保护局(EPA)颁布的最佳实用技术(BPT)排放限制。     

Past changes in the abundance of diatoms as inferred from a sediment core from Hebe Haven, Saikung, Hong Kong

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ１－１　ＤｉａｔｏｍｓＤｉａｔｏｍｓ（ＣｌａｓｓＢａｃｉｌｌａｒｉｏｐｈｙｃｅａｅ）ａｒｅｃｏｍｍｏｎａｎｄｗｉｄｅｌｙｄｉｓｔｒｉｂｕｔｅｄｉｎｂｏｔｈｆｒｅｓｈａｎｄｍａｒｉｎｅｗａｔｅｒｓ（Ｍｏｓｅｒ，１９９６）．ＴｈｅｓｅｍｉｃｒｏｓｃｏｐｉｃｕｎｉｃｅｌｌｕｌａｒｐｌａｎｔｓｆｉｘａｍａｊｏｒｐｏｒｔｉｏｎｏｆｔｈｅＥａｒｔｈ○ｓｃａｒｂｏｎ，ｇｅｎｅｒａｔｅｏｘｙｇｅｎ，ａｎｄｓｕｐｐｌｙｆｏｏｄｔｏａｎｉｍａｌｓｗｈｉｃｈｆｅｅｄｏｎｔｈｅｍ（Ｄｉｘｉｔ…     

Assessing the impact of air pollution sources in Hong Kong, a densely populated city

As the simple dispersion model tested is not sufficiently accurate to predict the SO2 concentration in complex terrain commonly encountered amongst high rise buildings in Hong Kong, and the lack of comprehensive local wind data at most sites prevents the use of more advanced dispersion model to assess the impact of major air pollutant sources, a receptor model approach is adopted for the apportionment of air pollution sources in Hong Kong. The preliminary results obtained are presented and discussed.     

Comparison of decolorization of reactive microorganisms isolated from various sources

Azo dyes are among the oldest man-made chemicals and they are still widely used in the textile, printing and the food industries.About 10% - 15% of the total dyes used in the industry is released into the environment during the manufacturing and usage. Some dyes and some of their N-substituted aromatic bio-transformation products are toxic and/or carcinogenic and therefore these dyes are considered to beenvironmental pollutants and health hazards. These azo dyes are degraded by physico-chemical and biological methods. Of these, biological methods are considered to be the most economical and efficient. In this work, attempts were made to degrade these dyes aerobically. Theorganisms which were efficient in degrading the following azo dyes-Red RB, Remazol Red, Remazol Blue, Remazol Violet, Remazol Yellow,Golden Yellow, Remazol Orange, Remazol Black- were isolated from three different sources viz., wastewater treatment plant, paper milleffluent treatment plant and tannery was tewater treatment plant. The efficiency of azo dye degradation by mixed cultures from each source wasanalyzed. It was found that mixed cultures from tannery treatment plant worked efficiently in decolorizing Remazol Red, Remazol Orange,Remazol Blue and Remazol Violet, while mixed cultures from the paper mill effluent worked efficiently in decolorizing Red RB, Golden Yellow and Remazol Yellow. The mixed cultures from wastewater treatment plant efficiently decolorized Remazol Black.