共查询到20条相似文献,搜索用时 46 毫秒
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采用原子分光光度法,通过实验选择最佳测定条件,利用标准曲线法和标准加入法来测定郑州市高新区自来水中的镁.测定结果,标准曲线法线性良好,且两种方法处理结果大致相同,该区自来水中含镁量为0.014克/升左右,符合国家标准. 相似文献
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古冶铜都黄石是我国青铜文化发源地之一,目前仍是我国重要的有色金属生产基地,铜等金属遍布山水之间,影响着人们的生产和生活。金属铜本身无毒,引起中毒的均为铜盐。但自然铜慢性摄入不会致人急性中毒,只能沉积在人体组织、内脏和骨骼中,特别是死亡后骨灰呈蓝绿色。容易引起人们误解而疑为急性铜中毒。笔者曾遇一例疑为急性铜中毒致死者,经临床会诊和动物实验而排除,报道如下:1案例简介刘某(女,84岁,家庭妇女),因恶心、呕吐、腹痛、腹泻入院治疗,诊断为感染性腹泻,中毒性休克,多器官功能衰竭,住院八天后死亡。火化后半年,家属疑刘某被人投毒… 相似文献
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杀虫双(Dimehypo)化学名:2-N, N二甲基1,3双硫代磺酸钠基丙烷,分子式C5H11NO6S4Na2,纯品为白色结晶,易溶于水,能溶于热乙醇,溶于甲醇、二甲基酰胺、二甲基亚砜、丙酮,不溶于乙酸乙酯、乙醚等有机溶剂。工业品为浅黄刑事技术2005年第4期色至浅棕红色液体,在pH8~9时主要为双钠盐,在pH6·5~7时主要为单钠盐,当pH<5或pH>10时不稳定。杀虫双是一种有机杀虫剂,中等毒,对害虫有较强的触杀和胃毒作用,并兼有一定的熏蒸作用。杀虫双在本地区广大农村是一种较普遍使用的杀虫剂,但检验通过皮肤吸收中毒死亡者的血液,笔者还是初次尝试。2003年7月1… 相似文献
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鱼塘水中五氯酚钠的提取及检验探讨 总被引:2,自引:2,他引:0
鱼中毒后从鱼塘水中检测毒剂成分比较困难,据调查佛山地区的鱼中毒案件,绝大部分都是五氯酚钠(对鱼毒性极大)所致.为此,笔者专门对此进行了探讨,并连续检测出几宗鱼中毒案件,介绍如下.1 材料和方法1.1 五氯酚乙醇标准液的配制:取五氯酚钠原粉适量加水50ml,搅拌至完全溶解(若有沉淀即过滤,去除滤渣),滴加盐酸直到不再析出自色沉淀,过滤,去除滤液,滤渣反复用蒸馏水洗涤至中性,真空干燥.取干燥粉末0.1g加至10ml容量瓶中,加无水乙醇到刻度.1.2检材提取:提取鱼塘水中的检材,应在死鱼最多的部位提取,或者水不流动的部位提取,并检查鱼塘中及其周围是否有可疑包装物.取检材500ml,放人1000ml梨形分液漏斗中,加盐酸调至酸性(pH=1),剧烈振荡后,加乙醚100ml,充分振摇萃取,静置分层后,将水层转入另一个盛有100ml乙醚的梨形分液漏斗 相似文献
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水中微量有机磷农药的检验 总被引:2,自引:0,他引:2
<正> 有机磷农药是目前广泛应用的杀虫剂。司法检验常遇到利用有机磷农药对水井,水池,鱼塘等场所进行投毒的案件,这类案件送检的水样一般含量甚微。本文介绍利用Sep—Pak C_(18)小柱富集水中几种微量有机磷农药,用毛细管气相色谱法检测。 相似文献
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ON THE RELIABILITY AND VALIDITY OF SELF‐REPORTED ILLEGAL EARNINGS: IMPLICATIONS FOR THE STUDY OF CRIMINAL ACHIEVEMENT* 下载免费PDF全文
The study of the monetary returns to criminal activity is a central component in many emerging areas of criminology, including rational choice and offender decision‐making, desistance, and criminal achievement. Scholars have been increasingly captivated with specification of the earnings function and with examining how variations in illegal earnings predict important outcomes such as persistence in offending. The potential utility of findings in related empirical studies hinges on the quality of the key measure, self‐reported illegal earnings. Yet to date scant attention has been paid by researchers to the measurement properties of this metric. We analyze self‐reported illegal earnings generated from a variety of instrumental crimes by using data from the Pathways to Desistance Study (n = 585) and the National Supported Work Project (n = 1,509), which are two longitudinal data sets of active offenders separated by more than 30 years. Findings based on analyses both within and between data sets reveal support for the internal consistency reliability and criterion validity of self‐reported illegal earnings. Moreover, the results reveal premiums in terms of higher earnings associated with different crime types, which are persistent both over time and across data sets. Implications and future directions for advancing the theoretical study of criminal achievement are also discussed. 相似文献
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血中苯酚及甲酚的固相萃取-GC/MS分析 总被引:1,自引:0,他引:1
用固相萃取-GC/MS对人血中的酚和甲酚进行定性和定量分析。采用GDX403对分析物和邻氯酚(内标)进行固相萃取,并采集总离子流色谱。根据分析物在血中的浓度,通过总离子流色谱峰的质谱和保留时间或特征离子质量色谱峰保留时间进行定性分析。实验采用特征离子质量色谱进行定量分析,线性范围0.02~10μg/ml。本方法检测限为10ng/ml,CV%为2.11~4.20%,分析物和内标的萃取率为68.6~89.5%,血中添加测定回收率为97.8~104%。本法测定健康人血中苯酚含量为2.2±0.4μg/ml. 相似文献
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电警棍致皮肤损伤的实验研究 总被引:3,自引:2,他引:3
本研究系用电警棍电击实验动物(猪),观察电击部位的皮肤喷涂金属显色剂后的颜色改变、组织学改变及金属含量的改变。结果表明,电警棍电击机体,不仅可致皮肤产生肉眼可见的损伤,而且可致皮肤细胞产生轻微的极化现象和皮肤金属化,这种金属化可通过金属显色剂喷涂和原子吸收分光光度计检测出来.本实验为电警棍电击伤的定性分析、检材的提取与处理提供了比较好的方法,有利于判定案件的性质和确定电警棍的种类。 相似文献
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Criminal background checks have now become ubiquitous because of advances in information technology and growing concerns about employer liability. Also, a large number of individual criminal records have accumulated and have been computerized in state repositories and commercial databases. As a result, many ex‐offenders seeking employment could be haunted by a stale record. Recidivism probability declines with time “clean,” so some point in time is reached when a person with a criminal record, who remained free of further contact with the criminal justice system, is of no greater risk than a counterpart of the same age—an indication of redemption from the mark of crime. Very little information exists on this measure of time until redemption and on how its value varies with the crime type and the offender's age at the time of the earlier event. Using data from a state criminal‐history repository, we estimate the declining hazard of rearrest with time clean. We first estimate a point of redemption as the time when the hazard intersects the age–crime curve, which represents the arrest risk for the general population of the same age. We also estimate another similar redemption point when the declining hazard comes “sufficiently close” to the hazard of those who have never been arrested. We estimate both measures of redemption as a function of the age and the crime type of the earlier arrest. These findings aid in the development of guidelines for the users of background checking and in developing regulations to enhance employment opportunities for ex‐offenders. 相似文献