硅藻土提取紫外导数光谱法测定血中马钱子碱

文章建立了用硅藻土提取血中马钱子碱———紫外导数光谱测定的方法。取检血1.0ml,加0.5ml去离子水混合均匀,加入硅藻土层析柱中,用二氯甲烷洗脱,收集洗脱液,50℃水浴挥至尽干。用4.0ml0.1mol/LHCL溶解,以0.1mol/LHCL为参比测定所得溶液的三阶导数光谱。线性范围0.5～6.25μg/ml,提取率为92.0%,变异系数2.4%,检出限0.38μg/ml。该法可作为法医毒物常规检验方法。     

血或尿中马钱子碱硅藻土提取紫外三阶导数光谱测定法研究

建立用硅藻土提取血、尿中马钱子碱——紫外三阶导数光谱测定的方法。取检血10mL,加05mL去离子水混合均匀,或检尿15mL(不必稀释),加入到装有23g硅藻土的层析柱中,用二氯甲烷洗脱,收集洗脱液,50℃水浴挥至尽干。用40mL01mol/LHCl溶解,测定所得溶液的三阶导数光谱。方法线性范围05～50μg/mL,提取率血为920%、尿为969%,变异系数24%,检出限血为0375、尿为061μg/mL,测量限血为125、尿为204μg/mL。     

紫外导数光谱法鉴别透明胶带

通过对200余种透明胶带紫外导数光谱分析,确定了最佳分析条件,验证了分析方法的重现性和稳定性。分析了不同胶带紫外导数光谱产生变化的原因,证明紫外导数光谱法是一种快速、简单、可靠、实用的鉴别透明胶带来源的方法。     

尿和血中杀鼠迷的固相萃取及紫外导数光谱法测定

杀鼠迷为目前国内生产使用的香豆索类抗凝血杀鼠药，由于投毒、意外等原因使人中毒事件时有发生，是刑事化验中常见毒物之一。它具有较强紫外吸收，紫外光谱法可用于中毒检材中含量测定。近来亦有紫外导数光谱测定的报道，但该法采用液液萃取进行分离，操作较繁琐。本文方法操作简便，亦对杀鼠迷的固相萃取方法及紫外导数光谱特征做了较详尽研究。实验部分一、仪器、试剂、材料日本岛津ＵＶ—２５０型紫外可见分光光度计。杀鼠迷，含量９５％，公安部第二研究所提供配制成１００μｇ／ｍｌ甲醇溶液供使用。甲醇、二氯甲烷等试剂，分析纯。实…     

紫外光谱法分析果树木屑的浸提物

文章阐述了果树木屑浸提物紫外光谱分析的方法。在实验中对35种不同树种及不同产地、同一树种果树木屑的紫外光谱、一阶导数光谱特征峰的异同进行了比较,确定了利用紫外光谱法鉴别果树木屑种类的依据。     

紫外及其导数光谱法检验红色圆珠笔油墨

应用紫外—可见光谱及导数光谱对常见的红色圆珠笔油墨的种类进行分析。选取国内外 5 2种红色圆珠笔油墨 ,首先对提取剂进行溶解性和干扰性的实验 ,选择了效果较好的乙醇作为提取剂。测定 5 2种样品的紫外可见吸收光谱 ,按其峰位不同分为三类 ,利用特征峰位法和K值比对法对三类样品的每一类分别进行分析鉴别 ;对依然没有区分开的样品利用一阶导数光谱的R值法进行进一步鉴别。同时 ,测定了样品的最小检出量。实验结果表明 ,此种方法可以鉴别不同厂家和牌号的红色圆珠笔油墨。该法操作简单 ,灵敏度高 ,结果准确 ,易于推广运用 ,为法庭实验室鉴别红色圆珠笔油墨提供可行实用的方法。     

无碳复写字迹的紫外光谱分析

目的建立一种简便、灵敏、准确的无碳复写纸字迹色痕的紫外光谱分析方法。方法用甲醇提取无碳复写字迹,提取液分别进行零阶光谱、一阶导数光谱法分析。结果依据零阶光谱特征的不同,能够对不同牌号、不同联次的无碳复写字迹进行大类的区别;一阶导数光谱图中,正、负峰的峰数、峰位、峰形及振幅值的比值差异显著,可以进一步对无碳复写字迹的种类进行鉴别。结论应用本论文所建立的紫外光谱分析方法,可以对可疑文件中添加、涂改字迹无碳复写字迹进行检验。     

导数光谱法鉴别毛线纤维上的染料

毛线织物是人们喜欢穿着的，在各种刑事案件的现场上常可提取一些微量毛线的检材。毛线纤维上染料的分析方法有报道用液相色谱法［１］［２］，但用紫外二阶导数光谱法分析毛线纤维上染料目前国内尚未见报道．本文对２９种毛线纤维上的提取液，用二阶导数光谱法进行测定，实验表明此法可以区分不同染料染成的不同或相同颜色纤维上的染料，也可区分相同染料不同配比染成的相同颜色纤维上的染料。本方法操作简便，分析速度快．一、仪器、试剂、样品１、仪器鸟律ＵＶ－２５０型分光光度计，自制微型萃取器．导数阶数：二阶，△入：４ｎｍ，波长…     

硅藻土提取——紫外导数光谱法测定血中硝基安定含量

固相萃取是一种新的分离方法，和传统的液液萃取法相比，具有萃取率高、操作简单、省溶剂、避免乳化等优点。固相萃取法按所用的固相材料可分为亲脂性（如Ｃ１８、ＧＤＸ４０３）材料固相萃取和亲水性（如硅藻土、硅胶）材料固相萃取两种。对于亲脂性材料萃取，国内已有较多的研究报导，而选用亲水性材料固相萃取，国内尚未见报道。我们经研究建立了血中硝基安定以硅藻土为固相材料进行提取，用紫外导数光谱进行测定的方法，该法表明用硅藻土进行萃取比用亲脂性材料进行的固相萃取操作更为简便、快速，药物回收率也更高。实验部分一、主要仪…     

录像磁带的理化检验

１．引言随着科学技术的进步，我国四化建设的迅猛发展，带来了摄录像设备应用的日益普及．摄录像设备不但应用在广播电视、文化教育、工矿企业、机关学校、医疗卫生、科研军事等部门，而且还进入了家庭。这就给公安司法检验工作提出了新的课题。如摄录像机被盗失主的确认，录像制品盗版者的认定，制造复制反动淫秽录像制品犯罪分子的辨认，录像资料做为诉讼证据时其来源的审查及其内容真伪的鉴定，录像资料的载体录像磁带本身的检验问题等等．本文仅就录像磁带的检验问题用紫外反射——导数光谱法进行研究，取得了初步成果。录像磁带是由磁…     

NUMBERS

正1.98 mln units China’s auto production in May,down 4.4 percent from April6 mln Number of highemission vehicles that China plans to remove from roads in 2014 to reduce pollution3.85 mln tons Amount of carbon emission quotas that     

Beijing Embraces APEC 2014

正On November 5-11,China hosts in Beijing the 2014 APEC Economic Leaders’Week,including the Concluding Senior Offi cials’Meeting,the 26th APEC Ministerial Meeting,and the 22nd APEC Economic Leaders’Meeting.During the Leaders’Week,China also hosts the APEC CEO Summit,APEC Business Advisory Council Dialogue with Leaders,and Leaders’spouse programs.     

Shanghai–Asia's City of Style

正AT Paris Fashion Week Fall/Winter 2014-2015 in March,Chinese celebrities fitted out in gorgeous gowns featuring Eastern fashion styles attracted much kudos.As China advances further onto the world stage,Shanghai is leading the fashion charge.U.S.-based Global     

Sino-Swiss FTA Pushes Bilateral Relations to New Heights

正CHINA and Switzerland signed in July 2013 the Free Trade Agreement(FTA)in Beijing,so marking the culmination of more than two years of negotiations and legal processes.The f irst free trade pact between China and a country in continental Europe,the agreement came officially into effect on July 1,2014.China Today held an exclusive interview with David Braun,head of the Economic,Financial and Commercial Section of the Embassy of Switzerland in China,to discuss the FTA in greater depth.China Today:What is the signif icance of the FTA for     

A Change of Game Plan

正The low-price strategy is losing ground in China’s home appliance market while industrial upgrade offers the only way out By Zhou XiaoyanAt midnight on April 14,over 2,000 an-gry workers of Galanz Group,a homeappliance maker,violently smashedeverything in the canteen,workers’dormitory,production lines and supermarkets in a Galanz     

INFORMATION

正Business Lunch at Barolo For a tasty change of pace during your busy day,why not stop by and enjoy a leisurely lunch at our snazzy eatery Barolo?It’s the perfect place to meet with friends,work colleagues and business associates.Whet your midday appetite with our traditional antipasto buffet,followed by a main course of your choice from the selection of     

China's CSR on the Global Market Fast Track——An Interview with Xu Zongxiang,vice president of China South Locomotive & Rolling Stock Corporation Limited(CSR)

正IN mid-December,the last round of procurements of tramcars and subway trains in China’s mainland for 2013 was completed alongside the release of the bid result for trains for the northern extension of Shanghai Metro’s Line 11.China South LocomotiveRolling Stock Corporation Limited(CSR),the larg-     

Economic Transformation through Industrial Restructuring

ON the morning of November 24,2013,the Hebei provincial government took action to demolish 10 shaft furnaces and 16 converters at eight steel and iron plants in Tangshan,Handan and Chengde,reducing the overcapacity of iron production by 4.56 million tons and steel production by 6.8 million tons.Prior to this,by the end of October 2013,the province had cut down on steel and iron overcapacity by 2.38 million tons.Steel and iron has long been a pillar industry for the Chinese economy;however,it has become common practice to cut down overcapacity of the industry.The government work report released at the First Session of the 12th National People’s Congress explicitly stated that efforts should be made to promote the transformation of the nation’s economic growth mode and accelerate industrial restructuring.Structural adjustment to the steel and iron industry now epitomizes China’s wider economic transformation.     

Government Consults Legal Counsel

正Various departments hire advisors to ensure rule of law By Wang Hairong Guo Xiaomin,deputy chief of Chongchuan District of Nantong,east China’s Jiangsu Province,has formed a habit of consulting the district government’s legal advisor before approving documents.     

Stemming the Slump

正In a bid to boost the sagging housing market,China has relaxed lending rules for home buyers By Zhou XiaoyanWang xingli is a realtor in Beijing.Instead of resting during the seven-day National Day holiday(October 1-7),he followed a jam-packed schedule spent bustling