首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 203 毫秒
1.
化学发光分析法作为现代痕量分析中的一种十分重要的方法,广泛地应用于体内药物分析领域,但其重现性和选择性较差,其应用相应地受到了一定的限制.将化学发光和其他技术联用能有效地克服其选择性、重现性差等缺点,使其在体内药物分析领域得到迅速发展.对化学发光法和其他技术的联用在体内药物分析中的应用进行了综述,主要包括高效液相色谱-化学发光检测法、毛细管电泳.化学发光联用检测法、化学发光免疫分析法、分子印迹-化学发光法及微流控芯片-化学发光检测技术等,并对化学发光联用技术的应用前景进行了展望.  相似文献   

2.
阐述了近年来国内液相色谱-质谱联用(LC-MS)分析方法在药物残留分析中的应用新进展,对几种常用的分析样品的预处理方法进行了讨论,并对液相色谱-质谱联用在药物残留分析中的应用前景进行了展望.  相似文献   

3.
萃取技术和联用技术在铅的形态分析中的应用   总被引:2,自引:0,他引:2  
铅是环境生物体系和食物中存在的污染元素,其毒性与化学形态密切相关。文章重点概述了国内外近年来萃取技术和联用技术在食品等物质中铅形态分析上的应用进展。  相似文献   

4.
将超声波应用于微透析与CE—ICP—AES联用技术,自行设计了超声透析装置,并将该联用技术用于大鼠全血中Mg的形态分析。实验优化条件为:融熔毛细管120cm×100μm(I.D.);缓冲溶液50mmol·L^-1 Tris—HCI(pH7.4);电泳电压18KV。在该条件下分析出镁以四种形态存在于大鼠血液透析液中,并通过标准Mg的迁移时间及加标后迁移时间对透析液中游离镁形态进行了表征,峰面积定量透析液中游离镁的含量为24.2mg·L^-1,RSD〈5%,该方法加标回收率为96.0%-103.6%。  相似文献   

5.
采用超滤—树脂联用技术分离提取桑椹红色素,研究了微滤预处理、操作压差和膜面流速对超滤膜通量的影响,确定了超滤的最佳提取工艺为:操作压差0.12 MPa,膜面流速2 000 L/h.色素超滤液经HPD—100树脂吸附后用75%乙醇洗脱、蒸发、干燥可得到纯度较高的桑椹红色素产品,其色价为35.60,在超滤的基础上色价提高1.3倍,相对水提法提高了5.7倍.  相似文献   

6.
甘油的TG—DTA定性定量测定法   总被引:2,自引:0,他引:2  
本文报道了使用TG—DTA联用技术定性、定量测定甘油的简单原理和方法,该方法简便、快速、准确、具有一定的应用价值。  相似文献   

7.
用CarbotrapTM349型吸附管对国产某牌号卷烟烟气气相成分进行收集,然后利用吸附热脱附-气相色谱-质谱联用技术对烟气气相成分进行了分析。分离和鉴定了122种化合物,其中烯烃、烷烃32个、呋喃类12个、酮23个、芳香族化合物21个、含氮杂环及胺类8个、醛7个、腈7个、含硫化合物4个、酸2个、醚1个、酯2个、醇3个。并初步分析了这些化合物对卷烟安全性和感官质量的影响。  相似文献   

8.
综述了色谱联用技术的发展概况,探讨了色谱联用技术在方剂的成分分析、指纹图谱、药物代谢及配伍规律研究中的应用,分析了色谱联用技术在方剂现代研究中的存在问题及对策;同时指出,随着色谱联用技术的不断发展,各种新型色谱技术在方剂的现代研究中将有更大的发展空间。  相似文献   

9.
采用氧化共沉淀-吸附联用技术处理COD测定废液,经处理后的废水达到国家标准(《中华人民共和国国家标准污水综合排放标准》GB8978—1996)规定的污水排放标准.排放废水中:总铬0.453mg/L。总银0.375mg/L.  相似文献   

10.
通过羧基酰氯酯化法合成了硬脂酸十六烷酯固—液相变材料,并使用傅立叶红外光谱仪(FT-IR)、广角X-射线衍射仪(WAXD)、示差扫描量热仪(DSC)、热重分析仪(TG)等测试手段研究了材料的结构、结晶性能以及热性能(相变焓、相变温度和热稳定性),发现所得材料具有较高的焓变,同时其热稳定性相比硬脂酸和十六醇得到了较大的提高,是一种具有较好相变性能的新型固—液相变储能材料.  相似文献   

11.
化学淋洗法修复重金属污染土壤效果研究   总被引:6,自引:0,他引:6  
在国内外相关研究的基础上,文章研究化学淋洗修复技术在重金属污染土壤修复方面的运用.用浓酸消解土样并用火焰原子吸收法测定土壤中重金属含量,选用土壤柱作淋洗实验,分析去离子水和EDTA溶液两种淋洗剂对Cu、Zn、Pb、Cd四种重金属的淋洗效率,并对化学淋洗修复效果进行比较.  相似文献   

12.
High-temperature corrosion is a serious problem for the water-wall tubes of boilers used in thermal power plants. Oxidation, sulfidation and molten salt corrosion are main corrosion ways.Thereinto, the most severe corrosion occurs in molten salt corrosion environment. Materials rich in oxides formers, such as chromium and aluminum, are needed to resist corrosion in high-temperature and corrosive environment, but processability of such bulk alloys is very limited. High velocity electric arc spraying (HVAS) technology is adopted to produce coatings with high corrosion resistance. By comparison, NiCr (Ni-45Cr-4Ti) is recommended as a promising alloy coating for the water-wall tubes, which can even resist molten salt corrosion attack. In the study of corrosion mechanism, the modern material analysis methods, such as scanning electron microscopy ( SEM ), X-ray diffractometry (XRD) and energy dispersive spectrometry (EDS), are used. It is found that the corrosion resistances of NiCr and FeCrAl coatings are much better than that of 20g steel, that the NiCr coatings have the best anti-corrosion properties, and that the NiCr coatings have slightly lower pores than FeCrAI coatings. It is testified that corrosion resistance of coatings is mainly determined by chromium content, and the microstructure of a coating is as important as the chemical composition of the material. In addition, the fracture mechanisms of coatings in the cycle of heating and cooling are put forward. The difference of the thermal physical properties between coatings and base metals results in the thermal stress inside the coatings. Consequently, the coatings spall from the base metal.  相似文献   

13.
ZiO2 was prepared by the hydrolyzation method in (NH4)2SO4-modified TiCl4 solution, and TiO2 photocatalysts were obtained by accelerating the precipitation of TiO2 powder in a high-temperature water bath. The photocatalysts were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Raman spectrum and UV-Vis (Ultraviolet-Visible) spectrometry techniques, and the photocatalytic activity in phenol-contaminated water was investigated. The results showed that photocatalysts calcined at 400 ℃ had a specific surface area of 138.2 m^2/g and an average particle size of 9 nm, and a significant increase in thermal stability of anatase phase. At the calcination temperature of 700 ~C, the crystal form of TiO2 started to change into rutile (anatase: 97%, rutile: 3%). The activity of TiO2 photocatalysts prepared with (NH4)2SO4-modified TIC14 solution was markedly stronger than that without (NH4)2SOg-modified TIC14 solution. Maximal photocatalytic activity was observed at the mole ratio of Ti:(NH4)2SO4= 1:2, the water-bath temperature of 90℃ and the calcination temperature of 700 ℃.  相似文献   

14.
采用电感耦合等离子体光谱和质谱法对汤岗子热矿泥中Na,Mg,Al,K,Ca,Mn,Fe,Co,Ni,Cu,Zn11种微量元素进行检测与分析.结果表明,热矿泥中含有丰富的微量元素,为探讨热矿泥对人体的保健作用提供了有用的依据、  相似文献   

15.
环棱褐孔菌挥发性化学成分的分析   总被引:1,自引:0,他引:1  
报道了用同时蒸馏-萃取装置提取环棱褐孔菌的挥发性物质,测得环棱褐孔菌挥发油的含量为5.06%,用GC/MS法从环棱褐孔菌挥发油中分离并确定出21种化学成分.用峰面积归一化法通过化学工作站数据处理系统,得出各化学成分在挥发油中的相对百分含量.  相似文献   

16.
千山侧柏叶挥发性化学成分分析   总被引:7,自引:0,他引:7  
报道了用水蒸气蒸馏-萃取法提取千山侧柏叶中挥发性物质,测得提取的千山侧柏叶挥发油含量为2.0%。用GC/MS法从千山侧柏叶挥发油中分离并确定出30种化学成分,占总挥发油总检出量的98.67%.用峰面积归—化法通过化学工作站数据处理系统,得出各化学成分在挥发油中的相对百分含量.  相似文献   

17.
The interaction between the heat source location, its intensity, thermal expansion coefficient, the machine system configuration and the running environment creates complex thermal behavior of a machine tool, and also makes thermal error prediction difficult. To address this issue, a novel prediction method for machine tool thermal error based on Bayesian networks (BNs) was presented. The method described causal relationships of factors inducing thermal deformation by graph theory and. estimated the thermal error by Bayesian statistical techniques. Due to the effective combination of domain knowledge and sampled data, the BN method could adapt to the change of running state of machine, and obtain satisfactory prediction accuracy. Experiments on spindle thermal deformation were conducted to evaluate the modeling performance. Experimental results indicate that the BN method performs far better than the least squares (LS) analysis in terms of modeling estimation accuracy.  相似文献   

18.
采用顶空固相微萃取(HS-SPME)对芦荟酒中的挥发性和半挥发性成分进行萃取.采用气相色谱.质谱(GC-MS)技术对其进行分析,在芦荟酒中共检测到18种化合物,其中酯类和醇类化合物分别是芦荟酒中种类最多和含量最多的两类化合物.结果表明,该方法适合分析芦荟酒的成分。比传统预处理方法更简单、效果更好.  相似文献   

19.
采用气相色谱/质谱联用技术(GC/MS)分析抗爆剂TKC辅助剂的成分.以抗爆剂的常用调合组分1,2-二氯乙烷做溶剂利用循环伏安法研究二苯胺的电子转移性质.结果表明:二苯胺类正离子自由基发生“尾-尾”偶合为联苯胺类化合物.  相似文献   

20.
采用水蒸气蒸馏法提取苍耳挥发油,并用气相质谱联用技术对挥发油的化学成分进行了分析,共分离鉴定出95个化合物,其主要成分为烷类、倍半萜内酯及醛酮类等.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号