Identification and determination of the major constituents in traditional Chinese medicine Longdan Xiegan Pill by HPLC-D

A novel and sensitive HPLC-UV method has been developed for the simultaneous determination of twelve major compounds in Longdan Xiegan Pill.The chemical profile of the twelve compounds,including geniposidic acid（1）,geniposide（2）,gentiopicroside（3）,liquiri     

Flow-injection-enhanced chemiluminescence method for the determination of three β-blockers

Objective To develop a rapid, simple and sensitive chemiluminescence method for the determination of three β-blockers (bisoprolol, atenolol and propranolol). Methods The chemiluminescence of cerium (Ⅳ)-sulfite system was obviously sensitized by adding anyone of three β-blockers in acid media. A new chemiluminescence method was set up by combining with flow-injection technique and used to determine the three β-blockers. Results Good linear ranges were obtained at the concentrations of 2.0×10-7g/mL-4.0×10-5g/mL, 1.0×10-7g/mL-3.0×10-5g/mL and 7.0×10-7g/mL-1.0×10-5g/mL, respectively, with the detection limits of 5.0×10-8g/mL, 7.0×10-8g/mL and 5.0×10-8g/mL (S/N=3), respectively, and the relative standard deviations for 11 times consecutive injections of 1.0×10-6g/mL bisoprolol, atenolol and propranolol were 3.57%, 2.21% and 2.26%, respectively. Conclusion The developed method is sensitive, accurate, rapid and of low cost. And it can be applied to determine bisoprolol, atenolol and propranolol in pharmaceutical preparations.     

混凝土结构无损检测系统iTECS应用研究

iTECS(Integrity Test Equipment for Concrete Structures)是一种多功能混凝土结构无损检测系统(见图1),可以同一时间、同一地点集成检测的主要项目有:结构物厚度的测定;测定应力波速度推算混凝土的抗压强度;裂缝深度的测定;     

液、塑限联合测定法的研究

液、塑限联合测定法在其他国家已经得到广泛应用,国内尚未正式推广。但作为一种能最大限度消除人为因素影响的试验方法,有着很好的应用前景。本研究主要目的是分析不同性质土的液、塑限联合测定法与人工手搓法试验的对比结果,找出其相应的试验规律,并为该项试验方法在国内得到广泛应用提供参考。     

浅谈混凝土减水剂之减水率测定方法的实际应用

通过测定掺减水剂水泥净浆标准稠度的方法来计算减水剂的减水率,为按GB 8076-2008标准测定减水剂减水率提供一种简捷的估算依据,从而快速判断混凝土减水剂的减水率以及和水泥的适应性问题,较好地配合混凝土配合比设计,以降低做配合比时劳动强度。     

盐渍土的试样制备方法探讨

本文分析了按常规土工试验方法制备试样测定盐渍土基本性质指标所存在的问题,探讨了盐渍土主要是硫酸盐盐渍土的土样制备方法。     

跳高、跳远起跳、游泳出发反作用力的实测与分析

本文根据对高校跳高、跳远和游泳运动员在起跳与出发时三维支撑反作用力的实测与分析,开 展技术诊断,开出运动处方。针对运动技术动作的最佳化和创造新技术等方面进行探索。大量 的实测数据可供运动训练,提高运动成绩之参考。      

磺酸固化剂中游离硫酸含量的测定

阐述了磺酸固化剂中游离酸测定的原理,介绍了试验方法和分析步骤并讨论了结果。     

热脱附-气相色谱/质谱法测定舰船用环氧面漆释放气体

舰船舱室中使用大量非金属材料,一些非金属材料在使用过程中不断地释放有害气体,从而使舰船舱室空气受到污染。本文建立了热脱附—气相色谱/质谱法测定舰船用某型环氧面漆脱气产物的方法。将环氧面漆刷于铝板上并晾干1个月后,置于不锈钢密闭容器中进行密封,在30℃温度下持续30d。对密闭容器中释放的有害气体以填装Tenax吸附剂的采样管进行吸附,以热脱附系统对浓缩采样管进行脱附,气相色谱/质谱仪进行分析。脱气组分中定性检测到烃类、醛类、酮类等。