离子交换分离富集原子吸收法测定岩矿中微量金   总被引：2，自引：0，他引：2  

孙明新  赵宝 《新疆地质》2006,24(3):335-338

试验了410#哌啶树脂对微量金的吸附性能.在ψ为5%~10%的王水介质中,Au与Cl-可形成[AuCl-]络阴离子,并可被410#哌啶树脂吸附.吸附物采用30g/L硫脲溶液解吸后,进行原子吸收光谱测定.方法经金管理样测定试验,结果与推荐值相符.  相似文献   

Fe2+ -邻二氮菲树脂相分光光度法测定痕量铁的研究     

李文杰  李国清  董福雄 《华东地质学院学报》2006,29(4):390-393

基于三乙醇胺-盐酸介质中,Fe2 与邻二氮菲形成的阳离子配合物被强酸型阳离子交换树脂吸附富集,使树脂显桔红色,据此建立了测定痕量铁的树脂相分光光度法,并讨论了适宜的实验条件。方法的检出限为1.65×10-2μg/mL,ε=9.44×104L·mol-1·cm-1。用于茶叶、余甘中痕量铁的测定,结果令人满意。  相似文献   

Cyclic terpenoids of contemporary resinous plant detritus and of fossil woods, ambers and coals   总被引：3，自引：0，他引：3  

Bernd R.T. Simoneit  J.O. Grimalt  T.G. Wang  R.E. Cox  P.G. Hatcher  A. Nissenbaum 《Organic Geochemistry》1986,10(4-6)

Cyclic terpenoids present in the solvent extractable material of fossil woods, ambers and brown coals have been analyzed. The sample series chosen consisted of wood remains preserved in Holocene to Jurassic sediments and a set of of ambers from the Philippines (copalite), Israel, Canada and Dominican Republic. The brown coals selected were from the Fortuna Garsdorf Mine and Miocene formations on Fiji.The fossil wood extracts contained dominant diterpenoid or sesquiterpenoid skeletons, and aromatized species were present at high concentrations, with a major amount of two-ring aromatic compounds. Tricyclic diterpenoids were the predominant compounds in the ambers. Aromatized derivatives were the major components, consisting of one or two aromatic ring species with the abietane and occasionally pimarane skeletons. The saturated structures were comprised primarily of the abietane and pimarane skeletons having from three to five carbon (C₁, C₂, etc.) substituents. Kaurane and phyllocladane isomers were present in only minor amounts. Bicyclic sesquiterpenoids as saturated and partial or fully aromatized forms were also common in these samples, but only traces of sesterterpenoids and triterpenoid derivatives were found.The brown coal extracts were composed of major amounts of one- and two-ring aromatized terpenoids, with a greater proportion of triterpenoid derivatives than in the case of the woods and ambers. This was especially noticeable for the German coal, where the triterpenoids were predominant. Open C-ring aromatized structures were also present in this coal. Steroid compounds were not detectable, but some hopanes were found as minor components in the German brown coal.An overview of the skeletal structure classes identified in each sample, as well as the general mass spectrometric characteristics of the unknown compounds are included in the present paper. It can be concluded from these structural distributions that aromatization is the main process for the transformation of terrestrial cyclic terpenoids during diagenesis, constituting a general pathway for all terpenoids.  相似文献   

Discussion on the development of salt chemical industry chain     

JIN Peng  CUI Qiang  WANG Xufeng 《《地质学报》英文版》2014,88(Z1):421-421

正China Pingmei Shenma Group is a large enterprise based on energy and chemical,with an annual output of 70million tons of coal,16 million tons of coke,680,000 tons of caustic soda,450,000 tons of PVC resin,50,000 tons of  相似文献   

混合大孔树脂纯化海芦笋总黄酮工艺的研究     

段筱杉  张朝辉  应锐  赵腾飞  侯虎  赵雪 《海洋科学》2017,41(1):30-38

以黄酮的吸附率、解吸率和回收率作为主要评价指标,对海芦笋(Salicornia bigelovii Torr.)总黄酮的纯化工艺进行了研究。结果表明,在5种大孔树脂中选取D101型、HPD600型两种树脂混合用于纯化,最佳混合比例为3︰2。混合树脂对海芦笋黄酮的最佳纯化工艺参数为:黄酮浓度为0.5 g/L时,pH为5的上样液以1.0 m L/min的上样流速进行吸附,上样量最大为27BV。待吸附完全,用4BV蒸馏水冲洗混合树脂柱后,用8BV60%的乙醇溶液进行洗脱,洗脱流速0.5 m L/min。采用该工艺纯化后,海芦笋黄酮的纯度提高至45.91%±0.44%,黄酮回收率为86.74%±0.46%,D101、HPD600混合树脂对海芦笋黄酮纯化效果良好,可用于海芦笋总黄酮的纯化。  相似文献   

横肋对螺纹钢树脂锚杆荷载传递的影响     

王伸  李化敏  李东印  王文 《岩土力学》2018,39(8):2805-2813

螺纹钢横肋的外形及尺寸显著影响树脂锚杆的锚固能力。为分析横肋对螺纹钢树脂锚杆荷载传递的影响,将拉拔条件下的螺纹钢树脂锚杆简化为轴对称模型,基于剪切-位移原理导出了关于剪切位移的二阶周期间断变系数齐次微分方程,对周期间断变系数进行Fourier变换,基于MATLAB求解出横肋影响下螺纹钢树脂锚杆剪切应力分布规律,并与圆钢锚杆进行对比分析;采用ABAQUS对螺纹钢锚杆受力进行模拟分析,并与理论分析结果对比验证;提出横肋应力集中因数F,对横肋的影响范围与影响程度进行了分析。研究表明,螺纹钢锚杆剪切应力沿锚杆轴向呈锯齿状递减分布;锚杆有效锚固承载区域内横肋应力集中因数F范围为[1.875,2.156];300 MPa拉拔荷载条件下横肋附近剪切应力峰值可达36 MPa,预示着锚固系统易从横肋附近损伤破坏。  相似文献   

絮凝剂-树脂联合法从琼胶中制备琼脂糖工艺研究     

鞠豪  张全斌 《海洋科学》2020,44(9):139-145

琼脂糖是一种具有高凝胶特性的天然高分子红藻多糖,具有良好的物理、化学和热稳定性,在医学和科研方面具有广泛的用途。在琼脂糖制备工业中,传统生产技术的局限性造成了国内琼脂糖尚未规模化生产。因此,有必要开发新的成本可控的琼脂糖制备方法。本文采用一种聚丙烯酰胺和弱碱性苯丙烯系阴离子交换树脂联用的方法来分离制备琼脂糖,以江蓠琼胶为原料,通过单因素试验优化琼脂糖的制备参数并对琼脂糖的理化指标进行测定。所得琼脂糖硫酸根含量为0.22%、凝胶强度为1 524 g/cm²、透明度为58.9%,凝固温度为39.7℃、融化温度为87.6℃,表明其具有相对较高的质量。该工艺简单经济,对发展琼脂糖工业具有一定的参考价值。  相似文献   

纳米SiO2改性甲基三乙氧基有机硅树脂与FEVE氟碳树脂保护性能对比          下载免费PDF全文

贾超  杜圣贤  张尚坤  于学峰  宋香锁  陈军  杨斌 《山东国土资源》2019,35(5)

随着供给侧改革的不断深入,创新驱动和新旧动能转换对新材料研制的需要越来越迫切。古生物化石保护意义重大。根据化石保护的特殊性,笔者所在团队通过大量的试验,研究出了一种新型防护材料——纳米SiO_2改性甲基三乙氧基有机硅树脂。该文从化石保护效果、透气性、防紫外线、抗老化等方面,将纳米SiO_2改性甲基三乙氧基有机硅树脂与FEVE氟碳树脂(氟烯烃-乙烯基醚共聚物)进行了对比,认为纳米SiO_2改性甲基三乙氧基有机硅树脂具有渗透性强,透气性好等特征,FEVE氟碳树脂的耐候性和抗腐蚀性比纳米SiO_2改性甲基三乙氧基有机硅树脂略好。因此,以纳米SiO_2改性甲基三乙氧基有机硅树脂为化石的底层防护材料,FEVE氟碳树脂为化石的表层防护材料,能对恐龙化石起到良好的保护效果。  相似文献   

6种不同产地柯巴树脂的谱学特征探究     

李佳蓉  李妍  武嘉欣 《岩石矿物学杂志》2024,43(3):709-718

收集了来自俄罗斯、新西兰、婆罗洲、马达加斯加、哥伦比亚和苏门答腊6个不同产地的柯巴树脂,采用宝石显微镜、红外光谱、紫外荧光观察和三维荧光光谱等测试方法对柯巴树脂谱学特征进行了对比研究。婆罗洲、苏门答腊柯巴树脂的红外光谱主要特征为存在3000~2800 cm^-1范围内4个吸收峰,1732 cm^-1肩峰和1708 cm^-1吸收峰,888 cm^-1处的弱吸收峰。新西兰柯巴树脂红外光谱主要特征为存在3000~2800 cm^-1范围内3个吸收峰,1642 cm^-1和888 cm^-1处的弱吸收峰。马达加斯加、哥伦比亚和俄罗斯柯巴树脂的红外光谱相似,主要特征为存在与C=C相关的3处组合特征吸收峰以及1270 cm^-1和1180 cm^-1处的2个吸收峰。在长波紫外荧光下,婆罗洲和新西兰柯巴树脂荧光强度明显强于其他产地样品,马达加斯加柯巴树脂荧光强度最弱。由三维荧光光谱可知,婆罗洲和苏门答腊柯巴树脂中存在445、474、505 nm 3个发射峰,可被416、447 nm波长有效激发;新西兰柯巴树脂的最强发射峰位于385 nm,其最佳激发波长352 nm;俄罗斯柯巴树脂最强发射峰在399 nm,可被354 nm波长最佳激发;哥伦比亚柯巴树脂的最强发射峰为470 nm,被400 nm波长最佳激发;马达加斯加柯巴树脂的最强荧光峰在465 nm,被378 nm波长最佳激发。综合分析认为,三维荧光光谱特征和红外光谱特征可为柯巴树脂的鉴别和分类提供依据。  相似文献