A novel method for cyanide quantification in human whole blood using ion chromatography with amperometric detection and its application to cyanide intoxication cases

Cyanide is a highly toxic agent that has been frequently used for suicide in South Korea. It is also used in various industrial fields, such as metal plating, in which many accidental cyanide intoxications have occurred. To overcome the disadvantages of conventional cyanide analysis methods, a simple and fast method for the analysis of cyanide in whole blood using ion chromatography (IC) with amperometric detection was developed in this study. Whole blood samples were deproteinized, diluted, and analyzed using an IC–amperometric detection system. The limits of detection and quantitation were 0.1 and 0.2 mg/L, respectively. The method showed good linearity in the range of 0.2 to 50 mg/L with R² > 0.99. The intra- and inter-assay precision and accuracy values were <10%. The established method was successfully applied to analyze whole blood samples from three cyanide intoxication cases.     

普通高校体育舞蹈课的调查与分析

作者在文中以体育舞蹈班的学生为研究对象，重点研究了大学生学习体育舞蹈的动机、思想状态及对师资和教学方面的要求。     

刑事技术在缉毒中的应用

在毒品案件的缉查中 ,我们一方面要注意通过侦查渠道获取直接证据 ,另一方面我们一定要重视运用刑事技术手段 ,收集同案件有关的各类物证、书证、视听资料、鉴定结论等其他间接证据 ,并使之相互印证 ,共同构成一个完整的证据体系 ,切实做到案件实事清楚 ,证据确凿充分 ,为毒品查缉工作发挥刑事技术的作用     

中毒死者体内毒鼠强的GC/MS-SIM分析

一 1 9岁男子赌气吞服一白色粉末 ,1 0min后口鼻流血、抽搐 ,迅速送医院 ,经催吐、透析等方法治疗 5天后死亡。根据中毒症状和经验怀疑为毒鼠强中毒。用GC/NPD检验肝中毒鼠强有干扰。改用GC/MS -SIM法分析 ,心血、肝和胃组织中全部检出毒鼠强 ,浓度分别为 0 5 1 μg .mL- 1、0 4 5 μg .g- 1和 0 33μg .g- 1,和文献结果在同一水平。GC/MS -SIM对复杂检材中低含量毒鼠强测定具有更高的选择性 ,也具有较高的灵敏度 ,同时进一步证实毒鼠强排泄较慢 ,经过较长时间后在体内分布比较均匀     

近代中国的反倾销问题及其当代启示

近代以来,面对洋货在中国的泛滥,有识之士提出了振兴民族经济、进行商战的应对之策,民间抵制洋货的群众性运动此起彼伏,振兴国货与实业救国逐渐成为国人共识,民国政府通过经济立法以抵制外货倾销,但未能取得实质性成效。近代中国反倾销的历史说明,国家的独立统一是解决反倾销问题的根本前提,提高国货产品的竞争力是解决反倾销问题的根本途径。     

印文、手印与复印墨痕形成顺序的实验研究

通过实验与检案相结合,提出了解决复印套印法变造文书所涉及的变造事实的确定、复印变造内容与印泥、印油印文、手印形成的先后顺序等问题的方法.     

Hierarchical Cluster Analysis of Ignitable Liquids Based on the Total Ion Spectrum

Gas chromatography–mass spectrometry (GC–MS) data of ignitable liquids in the Ignitable Liquids Reference Collection (ILRC) database were processed to obtain 445 total ion spectra (TIS), that is, average mass spectra across the chromatographic profile. Hierarchical cluster analysis, an unsupervised learning technique, was applied to find features useful for classification of ignitable liquids. A combination of the correlation distance and average linkage was utilized for grouping ignitable liquids with similar chemical composition. This study evaluated whether hierarchical cluster analysis of the TIS would cluster together ignitable liquids of the same ASTM class assignment, as designated in the ILRC database. The ignitable liquids clustered based on their chemical composition, and the ignitable liquids within each cluster were predominantly from one ASTM E1618‐11 class. These results reinforce use of the TIS as a tool to aid in forensic fire debris analysis.     

窖蛋白与不明原因心源性猝死的相关性研究进展

不明原因心源性猝死(unexpected sudden cardiac death,USCD)因其不伴有心脏结构的异常,尸体解剖呈阴性改变,一直是法医病理学鉴定的热点难题。USCD可能与部分致死性心律失常有关,该类心律失常多由心脏离子通道蛋白或其相关蛋白发生异常所致。窖蛋白可以通过其脚手架区域与多种心肌离子通道蛋白结合,在维持心肌动作电位的去极化和复极化中起到关键作用。当窖蛋白由于基因突变或蛋白表达异常等因素导致其结构和功能受到影响时,受其调控的心肌离子通道的功能也受到损害,继而引起多种离子通道病的发生,出现心律失常甚至心源性猝死。研究窖蛋白对离子通道功能的影响对于探索恶性心律失常及心源性猝死的发生机制具有重要意义。     

Rapid screening for the detection and differentiation of γ-hydroxybutyrate using ion chromatography

The analysis of gamma-hydroxybutyric acid (GHB) is problematic because it is hygroscopic, it lacks a good UV chromophore, and it undergoes heat-induced cyclization. This paper presents a new method utilizing ion-exchange chromatography (IC) with conductivity detection. The simple sample preparation, rapid analysis time, and inorganic anion detection capabilities are all advantages over the current methods. The detection of inorganic salts (formed during GHB synthesis) gives insight into the synthetic route utilized and can aid in drug seizure comparison. The developed method has a detection limit for GHB anions of 0.57 mg/L and chloride of 0.22 mg/L. A comparison of this technique with a current gas chromatography-mass spectrometry technique is presented, and a t-test found that the two methods' results are not statistically different at the 99.9% confidence level demonstrating the merits of this fast, simple, and informative IC method as a routine screening tool.     

Analysis of forensic soil samples via high-performance liquid chromatography and ion chromatography

Traditional forensic soil comparisons are performed via physical and/or chemical examinations of color, texture, and mineral content, leaving any organic- or water-soluble fractions unexamined. This study uses high-performance liquid chromatography (HPLC) and ion chromatography (IC) to assess the qualitative and quantitative variation in these fractions of soil. Soil samples (n=120) were collected over the course of 3 weeks from urban, suburban, and rural locations in and around Lansing, MI. Additional samples from six of these locations (two urban, two suburban, and two rural) were collected once a week for 10 weeks for temporal analysis. Nine additional samples, equally spaced over a 1 m(2) grid, from these same six locations were collected for spatial analyses. Qualitative and quantitative analysis of the resultant chromatograms separated the 120 samples into 10 groups by HPLC and 23 groups by IC. This study shows that using HPLC and IC to analyze the organic- and water-soluble fractions of soil can successfully discriminate samples. Quantitative analysis of the results eliminates some false inclusions by providing further differentiation of samples. The results of this study indicate that adding HPLC and IC analyses to traditional forensic soil analysis schemes can improve overall sample differentiation. The methods used in this study were also able to detect both qualitative and quantitative variations in soil over a relatively small geographic area. This demonstration of soil heterogeneity underscores the importance of the collection of a representative known sample population when assessing a forensic soil comparison. Significant temporal variation was also demonstrated over the course of 10 weeks of sampling; however, samples were found to be consistent over shorter periods of time. Baseline levels of inorganic anions were determined via IC; these levels may be useful in assessing the significance of anions detected in soil from cases involving low explosives.