Certified reference material of volatile organic compounds for environmental analysis: BTEX in methanol

Abstract

The Brazilian Metrology Institute (National Institute of Metrology, Quality, and Technology, Inmetro) has been developing a certified reference material (CRM) of the volatile organic compounds benzene; toluene; ethylbenzene; and ortho, meta, and para-xylenes (BTEX) in methanol, to ensure quality control for environmental-analysis measurements. The objective of this paper is to present the results of certification studies: uncertainty estimates related to characterization, a homogeneity study, and a stability study on a single lot of CRM composed of BTEX in methanol. The method used analysis of variance (ANOVA), a statistical tool, to evaluate the homogeneity and stability of the BTEX CRM, which complies with ISO Guide 30 series. The homogeneity and stability of the BTEX CRM was confirmed for all analytes and their respective properties. All the procedures used in this study complied with ISO GUIDE 34, ISO GUIDE 35, and the guide to the expression of uncertainty of measurement (GUM).

Development of a Water Matrix Certified Reference Material for Volatile Organic Compounds Analysis in Water

“…Some of the u bb were calculated through when MS among > MS within for some VOCs, while others were calculated through when MS among < MS within . As shown in Table 5 , the u bb of the 28 VOC analytes ranged from 0.18% to 3.73%, which was lower than the reported CRM of BTEX in methanol [ 19 ]. The u char and u lst of the 28 VOC analytes ranged from 0.87% to 9.44% and 0.91% to 11.4%, respectively.…”

“…The uncertainty of the water MCRM was calculated by combining the uncertainty of inhomogeneity (u bb ), instability (u lst ) and characterization (u char ) [18], and the u bb and u lst were those of VOCs spiking solution. Some of the u bb were calculated through u bb = s bb = 5, the u bb of the 28 VOC analytes ranged from 0.18% to 3.73%, which was lower than the reported CRM of BTEX in methanol [19]. The u char and u lst of the 28 VOC analytes ranged from 0.87% to 9.44% and 0.91% to 11.4%, respectively.…”

Development of gas standard reference material containing thirty volatile organic compounds at 1μmol/mol in nitrogen

“…Volatile organic compounds (VOCs) as the important precursor of ozone and PM 2. The metrological traceability of certi ed reference materials (CRMs) is an important factor to ensure the traceability of monitoring data (Ihara et al 2009; Neves et al 2015). VOCs CRMs with accurate concentrations, within-cylinder homogeneity and stability are urgently needed for environmental monitoring (Koziel et al 2004;Li et al 2017;Yarita et al 2007).…”

Benzene: A critical review on measurement methodology, certified reference material, exposure limits with its impact on human health and mitigation strategies

“…Additionally, it will reflect the mitigation strategies applied by regulators & need for future revisions of air quality guidelines.http://eaht.org methods have their advantages and limitations. Their selection depends on the specific monitoring objectives and available resources.Accurate calibration of benzene measurement instruments is essential to establish the measurement traceability of results obtained [38][39][40]. Accurate and precise data of benzene in the atmosphere is need of our due to its toxic nature and adverse health issues even exposure to very low concentrations.…”

“…Accurate calibration of benzene measurement instruments is essential to establish the measurement traceability of results obtained [38][39][40]. Accurate and precise data of benzene in the atmosphere is need of our due to its toxic nature and adverse health issues even exposure to very low concentrations.…”