刑事技术2016，Vol.41Issue(4)：279-282,4.DOI:10.16467/j.1008-3650.2016.04.005
气相色谱内标法测定甲基苯丙胺含量的不确定度评定
Evaluation of Uncertainty in Determination of Methamphetamine by GC with Internal Standard Method
梁丽军 1薛锦锋 1田琳琳 1刘明明 1沈磊1
作者信息
- 1. 浙江省嘉兴市公安局刑侦支队，浙江嘉兴 314001
- 折叠
摘要
Abstract
ABSTRACT:ObjectiveTo evaluate the uncertainty in determination of methamphetamine by gas chromatography (GC) with internal standard method.MethodsEach source of uncertainty, arising from the procedure of testing, was analyzed and conifrmed according to the guidelines of the uncertainty in measurement. Analysis of the measurement uncertainty during the experiment,including the uncertainty of calculation, measurement repeatability, standard substance, internal standard substance, sample and gas chromatography was taken. After each uncertainty component was evaluated, the combined standard uncertainty and the expanded uncertainty of the result were calculated.ResultsThe relative uncertainty brought from the measurement repeatability was 1.4 %, the one from preparation for internal standard solution of the SKF525A was 0.89%, the one from preparation for standard solution of the methamphetamine was 0.85 %, the one from gas chromatography was 0.78 %, and the one from preparation for the sample of methamphetamine was 0.081 %. The expanded uncertainty was 0.4 % when the methamphetamine content was 10.4 %.ConclusionsThe measurement uncertainty of methamphetamine comes primarily from the measurement repeatability of sample, preparation for standard solution of the methamphetamine, GC, preparation for sample and internal standard. The uncertainty from the sample preparation was relatively minimal, the uncertainty from the uniformity of the sample and peak area ratio can be ignored.关键词
法医毒物分析/不确定度/气相色谱内标法/甲基苯丙胺Key words
forensic toxicological analysis/uncertainty/GC-internal standard method/methamphetamine分类
社会科学引用本文复制引用
梁丽军,薛锦锋,田琳琳,刘明明,沈磊..气相色谱内标法测定甲基苯丙胺含量的不确定度评定[J].刑事技术,2016,41(4):279-282,4.
