和硫

For the synthesis of NHC precursors, there are also several routes: condensation of glyoxal, amines and paraformaldehyde; alkylation of imidazole or monosubstituted imidazole with alkyl halide; annulation of ortho esters and 1,2-diamines; ring closure of hydrazines or amides with acetic anhydride; reduction of thiones with Na/K in THF.

关于N-杂环卡宾前体的合成途径主要有：乙二醛、伯胺和多聚甲醛的缩合反应；卤代烷与咪唑及其取代咪唑的烷基化反应；原甲酸酯与1，2-二胺的成环反应；肼或酰胺与酸酐的环化反应；用Na/K对环硫脲化合物的还原反应。

Through analysis of the components of coking on different parts of desullfur system of single tower and the waste water containing sulfur , we find the cause of coking in the stripping desulur system from single tower is the polymerization reaction of carbohydrate and the separattion of varied solid powders, organic compounds, and all corrosive productions of metal out of waste water in high temperature, therefore,the solving method is how to decrease the oil content ,how to depolymerize form the carbohydrate and how to antisepticize by vapour of waste water.

对单塔脱硫系统中不同部位的垢物及现场催化含硫污水进行了分析测定，结果表明：塔内污垢成分及含量随塔体部位的不同而不尽相同，单塔汽提脱硫系统中垢物的形成，主要是由于污水中所含各类粉尘、有机物、金属腐蚀物等在高温下因石油碳氢化合物的析出及其单体的聚合反应所致。如何降低污水中的含油成分、减少聚合反应的生成、防止污水蒸气对塔体材料的腐蚀，是阻垢、除垢和防垢应解决的关键问题。

The sample was pretreated with 30% H2O2 and 2.5 mol/L NaOH,and then digested with aqua regia to make full oxidation of sulfur in thiolated chitosan resins to sulfate.

用w(H2O2)=30%溶液和2.5 mol/L NaOH溶液预处理样品，再用王水消解，样品中硫几乎完全转化为硫酸根。

Studied are the determining trace sulfur in iron, manganese ores and in cement by using spectroscopic method of inductancecoupling plasma emission, the selection of work conditions and the accuracy of results. As shown by tests, it is reliable to use aqua regia to resolve samples.

研究了利用电感耦合等离子体发射光谱法测定铁矿、锰矿、水泥等矿产品中微量硫的溶样方法、工作条件的选择和结果的准确性。

Comparing it with the standard electrode potential of nitric acid,the reason of dissolution of HgS in aqua regia was quantitatively revealed,and this is that the high concentration of chloride ions reduces the reduction potential of sulfur in HgS,thus raising the reducing power of HgS rather than that the oxidizing power.

根据热力学平衡原理和设计的可逆电池反应，由 E~0Hg~(2++S/HgS数据，计算了 E~0HgCl_4~(2++S/HgS+4Cl~-数值，将其与 HNO_3的标准电极电位比较，定量地揭示了 HgS 溶于王水的原因在于该溶液中高浓度 Cl~-离子降低了 HgS 中硫的还原电位，从而提高了 HgS 的还原性所致，并非王水的氧化性比 HNO_3的更强。

Based on a systematic study of a considerable number of polished ore sections as well as ICP-MS and electron microprobe analyses, the authors have found that the main sulfide minerals include galena, iron-poor sphalerite and chalcopyrite, whereas silver minerals are composed chiefly of native silver, pyrargyrite, argentite, polybasite, and argentiferous freibergite.

文章首次对其矿石矿物进行了系统的研究，通过对大量矿石光薄片观察、等离子质谱和电子探针分析，表明具有工业意义的硫化物主要有方铅矿、贫铁闪锌矿、黄铜矿，银矿物主要有自然银、深红银矿、辉银矿、硫锑铜银矿、含银黝铜矿，它们与硫化物共生，多沿方铅矿、贫铁闪锌矿等颗粒间或者裂隙产出。

The influence of the arsenic concentration and the sodium lignosulphonate concentration on the growth of the thiobacillus ferrooxidans strains, as well as the rates of bacterial oxidation of arsenopyrite and pyrite were studied.

本文着重研究了氧化亚铁硫杆菌对砷黄铁矿和黄铁矿单矿物的氧化规律及其性能之差异，考察其对砷的适应能力及表面活性剂的影响。

The effects of phoxim on the microbial community amount and the growth of ascendent bacteria, funguses and actinomyces in soil at 200-1 000 mg/kg three different concentrations were studied by indoor culture method.

采用室内培养法研究了土壤中200~1000mg/kg三种不同质量分数的辛硫磷对好氧性细菌、真菌和放线菌三大主要微生物种群数量及其优势菌生长速率的影响。

The neural complex of ascidian Styela clava was observed by two histological methods, and the methionine-enkephalin in the neural complex of Styela clava was analyzed by the immunohistochemical S-ABC (strept avidin-biotin complex) technique,respectively.

采用甲苯胺蓝染色和Golgi镀银法对柄海鞘神经复合体的结构进行显微观察，并通过免疫组织化学方法对甲硫氨酸脑啡肽在神经复合体中的分布进行了研究。

Based on mass data analyses, the changes of sulfur, paraffin, colloid and asphaltene contents of crude oil in profile are studied.

摘要根据大量分析资料，研究了石油中的硫、石蜡、胶质和沥青质在剖面上的变化规律。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。