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Results of the second comparison exercise for EU National Air Quality Reference Laboratories (AQUILA) for TC, OC and EC measurement (2011)

机译:欧盟国家空气质量参考实验室(AQUILA)进行TC,OC和EC测量的第二次比较结果(2011)

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摘要

The EC-JRC European Reference Laboratory for Air Pollution (ERLAP) has organized an inter-laboratory comparison for the measurement of total carbon (TC), elemental carbon (EC) and organic carbon (OC) in particulate matter collected on filters.To this comparison seventeen European Union National Reference Laboratories for air quality or delegated organizations participated, all using thermal optical analysis with the same analyzer (Sunset Lab off-line carbon analyzer). The aim of this comparison was to evaluate the performances of participants but also to study the effects of applying different thermal protocols, i.e. NIOSH and EUSAAR_2 protocols, currently in use in Europe for such analysis.In absence of a general consensus by the scientific community on the definition of a reference material for EC and, thus, of an standard reference analytical method, method performances [ISO5725-2] and laboratory performances [ISO 13528:2005(E)] were evaluated for TC and EC/TC ratio in the present comparison exercise.For TC, repeatability and reproducibility relative standard deviations ranged from 2% to 6% (sr = 0.017 × m + 0.227) and from 5% to 11% (sR = 0.038 × m + 0.389), respectively.For EC/TC ratio, repeatability and reproducibility relative standard deviations ranged from 2% to 10% and from 8% to 35%, respectively for the NIOSH-like protocol, and from 2% to 14% and from 4% to 19%, respectively for the EUSAAR protocol. (No satisfactory dependence was found upon EC/TC ratio).Furthermore, based on z-scores, three outliers were identified in the TC database when applying as standard deviation for proficiency assessment, σ*, that one calculated from data obtained in a round of a proficiency testing scheme. These outliers would also not comply with the DQO (i.e. expanded uncertainty, with a coverage factor of 2) of 25%, as in the EU Directive 2008/50/EC for PM at its limit value of 50 µg m-3.Laboratory performances were evaluated for EC/TC ratio, separately on the two data subsets from the NIOSH and EUSAAR_2 protocols using as σ* a common level of performance (i.e. 15%) that the inter-laboratory comparison coordinator would wish participants to achieve. Under this condition, four outliers were identified in the subset of data from the NIOSH-like protocol and one outlier in the subset of data from the EUSAAR_2 protocol.
机译:EC-JRC欧洲空气污染参考实验室(ERLAP)已组织了一个实验室间比较,以测量过滤器上收集的颗粒物中的总碳(TC),元素碳(EC)和有机碳(OC)。比较17个欧盟国家空气质量参考实验室或受委托组织参加了测试,所有实验均使用同一分析仪(Sunset Lab离线碳分析仪)进行热光学分析。进行此比较的目的是评估参与者的性能,还研究应用目前在欧洲用于此类分析的不同热学方案(即NIOSH和EUSAAR_2规程)的效果。在科学界尚未达成共识的情况下, EC的参考物质的定义,以及标准参考分析方法的定义,目前评估了方法性能[ISO5725-2]和实验室性能[ISO 13528:2005(E)]的TC和EC / TC比对于TC,重复性和重现性相对标准偏差分别为2%至6%(sr = 0.017×m + 0.227)和5%至11%(sR = 0.038×m + 0.389)。对于类似NIOSH的实验方案,TC比,可重复性和可再现性相对标准偏差分别为2%至10%和8%至35%,对于NIOSH类实验方案,则为2%至14%和4%至19%。 EUSAAR协议。 (没有发现对EC / TC比率的令人满意的依赖)。此外,基于z得分,当作为熟练度评估的标准偏差σ*时,在TC数据库中确定了三个离群值,其中一个是从一轮获得的数据中计算得出的能力测试计划。这些异常值也将不符合25%的DQO(即不确定性扩大,覆盖因子为2),如欧盟PM / 2008/50 / EC指令中限值为50 µg m-3的规定。在NIOSH和EUSAAR_2协议的两个数据子集上分别使用实验室间比较协调员希望参与者达到的共同绩效水平(即15%)来评估EC / TC比率。在这种情况下,在类似NIOSH的协议的数据子集中识别出四个离群值,在从EUSAAR_2协议的数据子集中识别出一个离群值。

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