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…     

DISTORTING HISTORY

正Shinzo Abe’s personal political ambitions endanger the region’s stability Yin Shuzhang,76,can never forget one winter night in 1943.It was the night when her family and a neighbor’s family stayed in a small cave close to her village on the coast of east China’s Shandong Province to hide from Japanese soldiers patrolling the area.She and     

Doing Justice to Anti-Trust Actions

正Since July,Chinese regulators have launched anti-trust investigations into several well-known foreign companies operating in China,including telecommunications company Qualcomm,computing giant Microsoft Corp.and Audi dealers under the auspices of FAWvolkswagen Automobile Co.Ltd.     

Right Timing for Price Reform

正Chinese Premier Li Keqiang pledged to accelerate price reform at a recent executive meeting of the State Council.Li pointed out that although price reform is difficult to carry out,it has long-term benefits and is a necessary step toward establishing the market mechanism.Price reform constitutes the crux of marketoriented reform.China’s market-oriented reform has to deal with two core issues:the relationship between     

ClEARSKIES BY2030

正Cutting carbon emissions has emerged as a key area of Sino-U.S.cooperation There are many topics on which China and the United States differ,but the need to reduce carbon emissions has become a shining example of bilateral cooperation and the future of the relationship between the world’s two largest economies.U.S.President Barack Obama and Chinese President Xi Jinping on November 12 announced their strongest     

Economy

正China Issues Rules to Control Local Debt Risks China’s State Council in early October released rules to strengthen the supervision and management of local government debt,the fi rst such directive ever introduced by the Chinese cabinet.According to the State Council document,local governments will be conferred the right of debt fi nancing within a quota.A standard debt fi nancing mechanism for local     

Will Asian Infrastructure Investment Bank Become a Reality？

正THE world economic pattern is gradually changing in the wake of the international financial crisis.Under the context of economic globalization,the international division of labor is still in progress,but encounters ever more challenges.In addition to the hurdles confronting the multilateral trading system,further adjustments are also required to the global financial architecture.Regional financial cooperation,in common with regional trade cooperation,needs more favorable conditions to develop.The interaction     

Hi Ho,Silver!

正In spite of a need for improvement in marketing strategies and product diversification,China’s"silver hair"industry represents a sprightly young prospect By Wang Jun the proportion a growth of China’s elderly population is projected to stimulate consumption of more than 100trillion yuan($16 trillion)over     

Forex Forever? China should control the growth of its foreign reserve assets and improve their management

正China’s foreign exchange(forex)reserves surpassed$2 trillion in April 2009,and a mere five years later,the number dou-bled by the end of June.This figure accounts for a staggering one third of all forex reserves worldwide.The colossal size of China’s forex reserves has elicited commentary from the country’s     

Diqing – Plateau Wonderlan

正DEEP in the snowy mountains of the Qinghai-Tibet Plateau,legend recalls,is a blessed valley in the shape of an eight-petal lotus.Spectacular snowcapped mountains,steep gorges and alpine meadows sprinkled with wildflowers are found here.It is Shangri-La in Yunnan Province’s Diqing Tibetan Autonomous Prefecture.     

NUMBERS

正137.2%Increase in Chinese tourists to Sri Lanka in the first half of 201426 mln Number of smartphones that electronics maker Xiaomi Corp.sold in the first half of2014,a year-on-year jump of 271 percent