络合剂对胶束三元络合物显色体系的影响1──锆(Ⅳ)-m-NPF-CTMAB 显色体系及其应用

在０．２４～０．４２ｍｏｌ／ＬＨＣｌ介质中，研究了１７种络合剂对锆（Ⅳ）－ｍ－ＮＰＦ－ＣＴＭＡＢ显色反应的影响。除乳酸、甘露醇、α－羟基异丁酸、氧代戊二酸和柠檬酸外，其余络合剂都使体系的吸光度降低。有乳酸和甘露醇存在下，有色络合物的表观摩尔吸光系数为１．３０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｚｒ（Ⅳ）在０～１０μｇ／２５ｍＬ符合比尔定律。方法用于铝合金中微量锆的测定，结果满意。     

新试剂2-(2''''-苯并噻唑偶氮)-1,8-二羟基-3,6-萘二磺酸与钛(Ⅳ)和 CTMAB 形成三元络合物显色反应的研究

在阳离子表面活性剂ＣＴＭＡＢ存在下，２－（２′－苯并噻唑偶氮）－１，８－二羟基－３，６－苯二磺酸与钛（Ⅳ）在ｐＨ３．５～４．５范围内发生高灵敏的显色反应，形成一种蓝色的三元胶束络合物，其最大吸收波长位于６５０ｎｍ，表观摩尔吸光系数ε＝１．２２×１０５·Ｌ·ｃｍ－１。络合物中钛（Ⅳ）与显色剂的组成比为１：２，钛含量在０～８．０μｇ／２５ｍＬ范围内符从比尔定律。间用于铝合金中微量钛的测定，结果满意。     

湿法磷酸脱硫（SO4^2—）净化研究

针对云南湿法磷酸进行了脱除硫酸根的实验研究，考察了沉淀剂用量，反应时间及温度等因素对硫酸根去除率的影响     

低温反相悬浮合成AA/AM共聚型吸水树脂

采用氧化还原引发体系，反相悬浮法低温合成AA／AM共聚型吸水树脂。研究了不同引发体系、单体组成、交联剂和引发剂浓度、温度、单体中和度对共聚物吸液能力的影响。与单一引发剂相比，采用复合引发体系，反应温度降低，聚合时间缩短，产物吸水速度和吸液能力高于聚丙烯酸钠，保水性略低于后者。共聚物最大吸液能力为：Q去离子水=970mL／g，Q生理盐水=129mL／g，Q人工尿=130mL／g。     

Stress-corrosion cracking of a monel 400 tube

A bent Ni-Cu Monel 400 alloy tube, which operated as part of a pipeline in a petrochemical distillery installation, failed by through-thickness cracking. The pipeline was used to carry a stream of gaseous hydrocarbons containing hydrochloric acid (HCl) into a reaction tower. The tower provided a caustic solution (NaOH) to remove HCl from the stream, before the latter was directed to a burner. Metallographic examination showed that the cracks were intergranular and were frequently branched. Although nominal chemical composition of the component was found within the specified range, electron dispersive analysis by X-ray (EDXA) indicated significant segregation of sulfur and chlorine on grain boundaries. Failure was attributed to hypochlorous-acid (HClO)-induced stress-corrosion cracking (SCC). The HClO was formed by the reaction of HCl with atmospheric O₂, and the oxygen entered the tube during shutdowns/startups of the installation. Residual stresses, originating from the in situ bend forming of the tube during assembly of the line, provided a driving force for crack growth, and the segregation of sulfur on grain boundaries enhanced the susceptibility of the material to cracking.     

蒙旦蜡化学组成的研究Ⅲ游离蜡酸

本文将阴离子树脂交换色谱法分离出的蒙旦蜡游离酸通过重氮甲烷(CH_2N_2)酯化,得到蜡酸甲酯。经GC/MS分析,碳数分布为XDCWFAC_(20)～C_(84),XDOWFA C_(20)～C_(34),SLCWFA C_(20)～C_(33),SLOWFA C_(20)～C_(33)。经硝酸氧化后,游离酸的碳数分布未发生变化。气相色谱分析结果表明,正构一元烷酸在游离蜡酸中的百分含量为:XDCWFA50.52,XDOWFA78.47;SLCWFA83.01,SLOWFA97.63。在纯蜡中相应百分含量为:6.32,32.96,35.69,54.67。最高含量碳分布:SLCWFA和SLOWFA中为C_(28),XDCWFA为C_(28),而XDOWFA为C_(26)。与蒙旦蜡烷醇一样,表现出很好的奇偶规律,即偶数碳烷酸占绝对优势。XDCWFA和XDOWFA有着比SLCWFA和SLOWFA更复杂的化学结构。     

Rapid and Sensitive Liquid Chromatography-Tandem Mass Spectrometry for Quantification of Glycyrrhetic Acid in Human Plasma

A simple, rapid and sensitive liquid chromatography-tandem mass spectrometry(LC-MS/MS) for the determination of glycyrrhetic acid in human plasma with ginsenoside Rh2 as internal standard was developed and validated. The plasma samples were prepared via liquid-liquid extraction with ethyl acetate. Chromatographic separation was accomplished on a Venusil MP-C18(50 mm×2.1 mm, 5μm i.d.) column at 25℃. The mobile phase consisted of acetonitrile/5 mmol·L-1 ammonium acetate(10:90, volume ratio) at a flow rate of 0.4 mL/min. Negative electrospray ionization was utilized as the ionization source. Glycyrrhetic acid and internal standard were determined via the mutiple reaction monitoring of precursor→production ion transitions at m/z 469→425, 409 and m/z 621→161,respectively. Each sample was chromatographed within 2.5 min. The lower limit of uantification was 0.50 ng/mL for 200 μL of plasma sample and the linear range was from 0.50 ng/mL to 800 ng/mL. The intra-and inter-day precisions were less than 8.76% in terms of relative standard deviation(RSD), and the accuracy was within a range of -3.25%-1.32% in terms of relative error(RE). The method was successfully applied to the pharmacokinetic studies of glycyrrhetic acid in healthy male Chinese volunteers after a single oral administration of 75 mg of glycyrrhizin.     

固化注浆在某尾矿库软弱地基处理中的应用

尾矿库的安全是矿山企业生存的必备基础条件,某尾矿库利用现有废石土资源加固培厚坝坡,受下游基础为软弱地基的影响,分别考虑不同处理方案,综合比较采用固化注浆的方式提高基础强度,根据稳定计算结果表明尾矿库安全满足规范要求。     

树脂浸渍补充增密对C/C复合材料摩擦磨损性能的影响

将CVD预增密至不同初始密度的C／C复合材料进行树脂浸渍／炭化补充增密至1.85g/cm^3，热处理后进行热物理性能的检测和不同刹车压力的摩擦磨损试验。结果表明，树脂浸渍／炭化是一种行之有效的快速致密化手段，所得制品的可石墨化性较好，导热性能也满足国外同类产品的要求；摩擦磨损试验和扫描电镜（SEM）观察结果表明，低一压力下形成的磨屑粒度明显大于高压下的磨屑，因而低压下的摩擦数高于高刹车压力下的摩擦系数。低压下的树脂炭对摩擦磨损的影响相对较大。