Stable isotopic geochemistry of organic carbon and pyrite sulfur from the Early Cambrian black shales in Northwestern Hunan, China

The early Cambrian black shale sequence in Northwestern Hunan Province has been investigated for its stable isotopic geochemistry of organic carbon and pyrite sulfur. The relatively low δ 13C values of organic matter, -29.7‰～-34.2‰, are interpreted as caused by the high CO2 concentration in atmosphere/ocean and an anoxic depositional environment in early Cambrian. Variable, but significantly positive δ 34S values, 10.2‰～ 28.2‰, for sedimentary pyrite reveals bacterial sulfate reduction as the pyrite-forming process but under sulfate-limited conditions. A protected anoxic basin, which had very limited access to open ocean, and its sediments, where metabolizable organic matter was rich and bioturbation was absent, are supposed to be the sulfate-limited environments and might have existed in South China in the early Cambrian.     

太原市二氧化硫污染现状与控制对策的思考

通过分析太原市二氧化硫污染现状及污染成因，提出了降低二氧化硫排放量的防治措施。     

燃烧氧化偶联离子色谱法检测甲醇中的硫

提出采用燃烧氧化偶联离子色谱法测定甲醇中硫含量的新方法 .方法通过离子色谱法直接测量甲醇中所含的硫在燃烧氧化过程生成的SO2 被I-3 氧化生成的SO2 -4 来测定甲醇中总硫含量 ,具有选择性高 ,快速 ,准确 ,灵敏等优点 .检测限为 2 .8× 10 -6% .     

羰基钴催化下卤代烃与硫的反应及其机理研究

羰基钴催化下卤代烃与硫的反应及其机理研究王进贤（化学系）第一作者简介王进贤，男，５６岁。１９６０年毕业于西北师范学院化学系，现为西北师范大学化学系教授，硕士研究生导师。主要研究方向为精细有机合成与金属有机化学，先后在国内外学术刊物发表论文７０多篇；中...     

镍硫化物湿法冶金基础研究

文中发表了我们在镍湿法冶金方面的研究工作。我国原有的镍冶炼流程是在熔炼高镍锍之后采用缓冷、磨浮分离铜、镍硫化物。国内已研究过用二段常压浸出及一段氧压浸出使镍进入溶液,可取消冷却和磨浮工序。然而采用加压浸出,在设备和操作上有不少困难,而且能耗较大。我们研究了Ni_3S_2浸出反应的热力学与动力学,并用工业镍高锍进行了试验,证明可以实现常压酸浸出。其关键是样品制备、温度与传质条件。浸出反应遵守1-(1-α)~(1/3)=kt关系式。浸出反应与溶液成分如H~ ,Cl~-及Cu~(2 )有关。发现Cu~(2 )的影响有双重性,Cu~(2 )在镍硫化物表面生成Cu_2S时阻碍反应,此时浸出反应符合1-2/3α-(1-α)~(2/3)=kt关系式,但存在于固体中的铜的硫化物可以加速浸出过程。从研究Ni_3S_2酸溶解机理发现,抑制难溶的β-NiS生成是提高浸出率的重要措施。这一研究结果为实现镍高锍常压浸出提供了理论根据。     

二氧化硫污染治理现状及其研究进展

文中综述了脱硫的各种技术方法，对其中有代表性的烟气脱硫技术举例，并指出了当今脱硫技术方法选择及研究热点和方向，提出了对当今烟气脱硫技术选择的看法。     

Development of Several New Reactions and Their Application to the Total Synthesis of Biologically Active Natural Products ：Synthesis of Linderol A and Determination of Its Absolute Configuration

Linderol A （1）, a monoterpene-polyketide, was isolated in 1995 from the fresh bark of Lindera umbellata （Lauraceae）, and its absolute structure was not determined. It was also reported potent inhibitory activity of 1 on the melanin biosynthesis of the cultured B-16 melanoma cells. See Fig. 1. On the other hand, we reported in 1995 an interesting multi-tandem reaction of coumarin derivatives （2; W = electron withdrawing group） by treatment with CH2 = S（O）Me2 to yield stereoselectively a tricyclic 2-substituted （4） via a cyclopropane intermediate （3） cyclopenta [ b ] benzofuran-3-ol derivative （Scheme 1）.     

Development of Several New Reactions and Their Application to the Total Synthesis of Biologically Active Natural Products :Synthesis of Linderol A and Determination of Its Absolute Configuration

1Introduction Linderol A (1), a monoterpene-polyketide, was isolated in 1995 from the fresh bark of Lindera umbellata (Lauraceae), and its absolute structure was not determined[1]. It was also reported potent inhibitory activity of 1 on the melanin biosynthesis of the cultured B-16 melanoma cells[1]. See Fig. 1. On the other hand,we reported in 1995 an interesting multi-tandem reaction of coumarin derivatives (2; W = electron withdrawing group) by treatment with CH2 = S(O)Me2 to yield stereoselectively a tricyclic 2-substituted cyclopenta [ b ] benzofuran-3-ol derivative (4) via a cyclopropane intermediate (3) (Scheme 1)[2].     

二正丙基四硫合成的研究

以一氧化硫和正丙基硫醇为原料，用石油醚作溶剂，在－9℃下反应，合成了二正丙基四硫，产率由文献报道的46．6％提高到97．2％；通过气相色谱、红外光谱和色谱－质谱联用等分析手段证实了其结构．     

硫化钠法处理SO_2烟气的吸收液脱砷研究

研究了在采用硫化钠吸收低浓度二氧化硫烟气制硫磺粉的工艺过程中吸收液除砷的工艺条件，包括反应时间、反应温度、溶液ｐＨ值以及沉降条件等因素对除砷率的影响．结果表明，当反应时间为５０ｍｉｎ，反应温度为３０～５０℃，溶液ｐＨ值在２～５范围内时，可以达到除砷的目的．同时，还确定了以聚合硫酸铝为絮凝剂的沉降分离方法，当聚合硫酸铝的用量（质量分数）为５×１０－６～１０×１０－６时，可加快沉降速率，提高脱砷率．