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采用5个浓度水平样品通过7家实验室进行协同评定试验,验证了甲烷分析方法的稳定性与准确性.由于个别实验室或数据可能与其他实验室或其他数据存在明显不一致从而影响统计处理,故应用数学统计法对这些数值进行了一致性和离群值检验,并应用柯克伦和格拉布斯法则对测量方法与结果的准确度进行了确定.统计结果表明,甲烷在204.0~99400μL/L浓度水平范围内,参与统计的各实验室所提供的测量结果全部被采纳,且气体浓度与标准差呈现指数函数关系.通过协同评定试验结果表明,CH4气体可以应用气相色谱直接注射进样和热导检测器联合检测,方法可靠.
Collaborative assessment of five methane concentration samples in seven laboratories was conducted to verify the stability and accuracy of the methane analysis method.Due to the obvious discrepancy between individual laboratories or data and other laboratories or other data, Therefore, the consistency and the outliers test of these values were carried out by using mathematical statistics method, and the accuracy of measurement methods and results was confirmed by using Kirklean and Grubbs’ laws.The statistical results showed that when methane concentration was 204.0-99400 μL / L In the horizontal range, the measurement results provided by all participating laboratories were all adopted and the gas concentration showed an exponential function with standard deviation.The results of the collaborative assessment showed that the CH4 gas can be directly injected into the sample and the thermal conductivity Detector joint detection, reliable method.