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95例尸体血中HbCO%的分析 总被引:4,自引:2,他引:4
血中碳氧血红蛋白饱和度(简称HbCO%,下同)含量是判断一氧化碳中毒,推断火灾中尸体生前状态的依据。本文证明:血中HbCO%与其年龄、性别及不同情况下CO中毒有关。一氧化碳中毒的尸体含量较高(平均大于60%);火灾事故中遇难的尸体含量中等(平均在30~50%);而被杀后投入火场或服毒后自焚则较低(平均小于20%)。 相似文献
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四阶导数光谱法测定血液碳氧血红蛋白饱和度 总被引:1,自引:0,他引:1
本文报导了两种利用四阶导数光谱测定血液 HbCO%的方法。一种需从检血制备一氧化碳饱和血溶液,操作稍繁但准确可靠,受仪器稳定性影响较小。另一种不需制备一氧化碳饱和血溶液,是一种操作简单,快速亦准确可靠的方法,但由于计算中使用预先测定的常数,测定的准确性乃受仪器稳定性波动的影响。 相似文献
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检验血液中碳氧血红蛋白饱和度越来越多地应用仪器进行定性、定量分析,其中紫外光谱法由于简单、方便,应用较普遍。但该法需要对所得到的紫外光谱图进行手工测量计算,常常产生较大的误差。本文采用Matlab软件,根据碳氧血红蛋白饱和度的计算方法编写了一个程序,消除了这种人为的误差,并实现了测量过程的自动化,且计算快速、简便。Mat-lab软件计算功能强大,提供了一种演算纸方式的编程语言,已成为科学研究和工程计算的基本技能[1,2],但在法庭物证科学中的应用还很少,现报道如下。1一氧化碳中毒血紫外吸收光谱图取0.2ml检血,加适量的蒸馏水稀… 相似文献
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血液样品中防腐剂对碳氧血红蛋白稳定性的影响 总被引:1,自引:0,他引:1
目的研究临床上常用8种试剂对血液样品中碳氧血红蛋白(HbCO)稳定性的影响。方法将血液样品分为高、低两个HbCO浓度组,选用临床常用的甲醛、氟化钠、乙二胺四乙酸二钠、亚硝酸钠、草酸钾、肝素钠、柠檬酸钾及氟化钠与草酸钾混合物(1:3)8种试剂,按常用浓度分别添加到血样品中,并于添加后0h、2h、8h、24h、3d、7d用紫外可见光分光光度法检测其中HbCO饱和度,用统计学方法进行结果分析。结果本实验选用的8种试剂只有甲醛和亚硝酸钠对HbCO的稳定性影响较为显著,而其余6种对HbCO稳定性的影响无统计学意义。结论在检验疑似CO中毒并经甲醛或亚硝酸钠防腐的检材时应慎重,以免导致错误的鉴定结论。 相似文献
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Y. Katsumata M. Aoki K. Sato M. Oya S. Yada O. Suzuki 《Forensic science international》1981,18(2):175-179
The spectrophotometric method for the determination of carboxyhemoglobin (HbCO) in blood reported by Fretwurst and Meinecke was modified so as to give the same values of percentage HbCO (HbCO%) as those determined by the oxygen electrode method. Values of HbCO% of nine practical samples determined by both the oxygen electrode method and the present method were nearly identical regardless of the presence of methemoglobin (Met-Hb) in blood. The present method is suitable for forensic practice. 相似文献
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This paper describes the spectrophotometric determination of carboxyhemoglobin (CO-Hb) in blood on the basis of double wavelength spectrophotometry of absorbance difference. Absorbance measurements are made in the 500–600 nm region at a blood dilution of 100–200-fold. Blood is diluted with a solution containing Na2S2O4 to provide two components of CO-Hb and deoxyhemoglobin (deoxy-Hb). Absorbance difference at the two wavelengths at which deoxy-Hb has the same absorbance reflects only the CO-Hb component because the opposite component is nulled out of the mixture. After measurement of the absorbance difference, the measuring solution is saturated with CO gas to make all Hb derivative CO-Hb and remeasured at the same wavelengths. The percent of CO-Hb is considered the absorbance difference ratio. Results obtained by the present method was in satisfactory agreement with gas chromatographic data in blood not containing methemoglobin (Met-Hb). Comparative experiments using the gas chromatographic method and the present method were performed with samples containing Met-Hb. However, while there is a deficiency in the gas chromatographic method when the samples contain Met-Hb, the results of the present method were in close agreement with theoretical values when samples are mixed with CO-Hb, O2-Hb and Met-Hb. Advantages of this method are that it is simple and accurate, standard curve or equation for calculation and accurate dilution are not necessary. 相似文献
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K. Sato Y. Katsumata M. Aoki M. Oya S. Yada O. Suzuki 《Forensic science international》1981,17(2):177-184
Kinetics of the oxidation of carboxyhemoglobin (HbCO) by potassium ferricyanide was studied photometrically in a weakly acid solution. An increase in the absorbance at 630 nm reached a maximum within 10 min when over a 100-fold excess of ferricyanide to hemoglobin iron was used. A slight decrease in the absorbance was observed after completion of the reaction when over a 500-fold excess of the reagent was used. In the presence of 0.4% Sterox SE, the absorbance began to decrease without complete oxidation. From these findings, a simple, rapid and accurate method for the determination of methemoglobin (Met-Hb) in blood was devised. The method was compared with two other methods, using 11 blood samples containing various amounts of HbCO, and proved to be suitable for blood containing elevated HbCO as well as for ordinary blood. 相似文献
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Lubricating oil comparisons impact a variety of forensic investigations, including cases where oil was transferred from a suspect vehicle to the crime scene or victim. In this study, high-temperature gas chromatography/mass spectrometry was used to examine the influence of oil mixtures and oil changes over time on the comparison of known and questioned lubricating oils. Varying concentrations of oil mixtures were prepared and showed the potential for identifying individual components. Motor oils from 18 automobiles monitored over a 2-month period did not demonstrate significant changes in the chromatographic data. Chemometric analysis of motor oil mass spectral data provided little information regarding differentiation of, or changes in, the samples. Power steering fluid (PSF) from a naturally occurring leak collected from several locations was consistent with the PSF in the automobile's reservoir, and the PSF composition did not change over time. 相似文献
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目的探讨硫化氢(H2S)中毒者血中H2S的检测及特征鉴别;方法取新鲜空白血液和5℃下保存1月、1年的血液各2m L,经微波低火加热1min后,吸取顶空气体100μL进行GC/PFPD-S、GC/MS检测;取相同样本进行酸化处理后进行检测;取疑似为H2S中毒者血液直接加热后进行检测。结果新鲜血液和5℃下保存1月、1年的血液均可检出H2S成分,但保存1个月以上的血液可同时检出二硫化碳(CS2)成分;酸化处理后的血液,H2S和CS2成分检出的含量明显比未加酸化的血液高;中毒者血液中除了检出H2S成分外,还检出甲硫醚成分。结论血液样本同时检出H2S和较大量的CS2时,不宜判定为H2S中毒,提示可能为腐败所致,而同时检出H2S和较大量的甲硫醚,则可做出H2S中毒的判断。 相似文献