中国吉林长白山地区地幔捕虏体中硫化物熔体包裹体

Mantle xenoliths are common in the Cenozoic basalts of the Changbaishan District, Jilin Province, China. Sulfide assemblages in mantle minerals can be divided into three types： isolated sulfide grains, sulfide-meh inclusions and filling sulfides in fractures. Sulfide-inch inclusions occur as single-phase sulfides, sulfide-silicate melt, and CO2-sulfide-silicate melt inclusions. Isolated sulfide grains are mainly composed of pyrrhotite, but cubanite was found occasionally. Sulfide-inch inclusions are mainly composed of pentlandite and MSS, with small amounts of chalcopyrite and talnakhite. The calculated distribution coefficient KD3 for lherzolite are similar to that of mean experimental value. The bulk sulfides in lherzolite were in equilibrium with the enclosing minerals, indicating immiscible sulfide melts captured in partial melting of upper mantle. Sulfide in fractures has higher Ni/Fe and （Fe ＋ Ni）/S than those of sulfide melt inclusions. They might represent later metasomatizing fluids in the mantle. Ni/Fe and （ Fe ＋ Ni ）/S increase from isolated grains, sulfide inclusions to sulfides in fractures. These changes were not only affected by temperature and pressure, but by geochemistry of Ni, Fe and Cu, and sulfur fugacity as well.     

原子吸收法测定废水中可溶性硫化物的研究

一、前言水中硫化物是水质的主要污染物之一,水中硫化物主要来自于工业废水排放或在厌氧条件下,水和底泥中的微生物以有机物为养料,将硫酸盐转化成硫离子。因而在许多工业废水及井水中都含有硫化物,如果每升水中仅有数十微克的硫化物,就会产生特殊的臭味,它有毒;人体大量吸入硫化物则引起心脏和肺神经中枢麻痹,造成昏厥和死亡,所以工业废水和天然水中硫化物成为环保监测的必测项目之一。目前,对水中硫化物测定方法主要有碘量法、对氨基二甲基苯胺法、离子选择电极法及萤光素汞萤光光度法等,目前国内外将碘量法和对氨基二甲基苯胺法例为国家标准方法,在使用这两种方法时,我们     

我国大洋科考第34航次起航计划时间219天约2万海里

<正>[导读]执行我国大洋科考第34航次任务的"大洋一号"船今天从三亚起航。科技日报北京11月16日(记者陈瑜)执行我国大洋科考第34航次任务的"大洋一号"船今天从三亚起航。按照我国与国际海底管理局签订的多金属硫化物勘探合同,本航次主要任务是切实履行"西南印度洋多     

比色法测定不同地区水中硫化物新方法的研究

本文针对磷钼蓝比色测硫新体系,通过条件试验表明,该显色体系最大吸收峰位于710nm,极低显色酸度,磷酸根：钼酸铵=1000μg：5%5ml （50ml）,沸水浴加热显色10分钟,ε=2.14＆#215;103L＆#183;mol-1＆#183;cm-1。工作线性范围较宽0-300μg/50ml仍不弯曲。考察了水中多种阴阳离子和混合离子的干扰情况,表明亚硝酸根对本法干扰严重。应用了3件含硫不同的实际水样分析,新老方法结果对照,结果令人满意。