Report/Guide

Bacquart, T; van der Veen, A M H*; Bartlett, S; Ent, H*; van Wijk, J I T*; Minarro, M D; Hill-Pearce, R E; Brewer, P J; Brown, R J C; Brown, A S; Murugan, A (2017) Euramet 1220: International comparability on hydrogen purity analysis. NPL Report. ENV 16

Brewer, P J; Brown, R J C; Panagoulia, D; Tromans, A*; Reyes, A*; Arce, M*; Vospelova, A*; Pratt, K W*; Asakai, T*; Jakobsen, P T*; Jensen, H*; Oliveira, C S*; Camoes, M F*; Spitzer, P*; Adel, B*; Mariassy, M*; Vyskocil, L*; Fisicaro, P*; Stoica, D*; Uysal, E* (2014) CCQM P37.2: international comparison on Ag|AgCl electrodes for pH measurement. NPL Report. AS 89

Allen, N D C; Brewer, P J; Brown, R J C; Lipscombe, R P; Woods, P T (2014) Intercomparison exercise for the analysis of components in indoor air. NPL Report. AS 86

Brewer, P J; Minarro, M D; Amico di Meane, E; Brown, R J C; Tuma, D*; Fröhlich, M*; Beránek, J*; Gilge, S*; Walden, J*; Cieciora, D*; Sega, M*; Lagler, F*; Mace, T*; Pascale, C*; Fükö, J*; Valkova, M*; Stummer, V*; Nieuwenkamp, G*; van der Veen, A M H* (2014) Key Comparison of nitrogen monoxide in nitrogen relevant to ambient levels (EURAMET QM-K26a / Project 1183). NPL Report. AS 87

Minarro, M D; Brown, R J C; Brewer, P J (2013) Review of existing methods for generating dynamic reference standards of key airborne molecular contaminants. NPL Report. AS 81

Brewer, P J; Brown, R J C; Gonzaga, F B*; Hongyu, X*; Bing, W*; Spitzer, P*; Jakobsen, P T*; Chanpion, R*; Fisicaro, P*; Stoica, D*; Ohata, M*; Vyskocil, L*; Mariassy, M*; Pratt, K*; Monroy, M*; Reyes, A*; Kozlowski, W*; Kardash, E*; Ivanova, D*; Camoes, M F*; Lee, H*; Hwang, E* (2011) CCQM P37.1: preparation of Ag/AgCl electrodes for harned cell measurements. NPL Report. AS 60

Brewer, P J; Milton, M J T; Harris, P M; Bell, S A; Stevens, M; Scace, G*; Abe, H*; Mackrodt, P* (2011) EURAMET 1002: International comparability in measurements of trace water vapour. NPL Report. AS 59

Article

van der Veen, A H M; Zalewska, E T; van Wijk, J I T; Kobayashi, M; Akima, D; Uehara, S; Fioravante, A L; Augusto, C R; Ribeiro, C C; Silva, V; Dias, F; Botas, A; Costa, C; Lee, J; Lee, J; Lim, J; Bae, H-K; Kang, N; Cecelski, C E; Harris, K J; Miller Jr, W R; Carney, J; Tshilongo, J; Ntsasa, N G; Jozela, M I; Leshabane, N; Marebane, P M; Worton, D R; Mussell Webber, E B; Moreno, S; Brewer, P J; Konopelko, L A; Kolobova, A V; Pankratov, V V; Efremova, O V (2023) International comparison CCQM-K3.2019 automotive exhaust gases. Metrologia, 60 (1A). 08008

Culleton, L P; Amico di Meane, E; Ward, M K M; Ferracci, V; Persijn, S; Holmqvist, A; Arrhenius, K; Murugan, A; Brewer, P J (2022) Characterization of Fourier Transform Infrared, Cavity Ring-down Spectroscopy and Optical Feedback Cavity-enhanced Absorption SPectroscopy Instruments for the Analysis of Ammonia in Biogas and Biomethane. Analytical Chemistry, 94 (44). pp. 15207-15214.

Brown, R J C; Brewer, P J; Pramann, A; Reinitz, O; Guttler, B (2021) Redefinition of the mole in the revised international systems of units and the ongoing importance of metrology for accurate chemical measurement. Analytical Chemistry, 93 (36). pp. 12147-12155.

Brown, R J C; Brewer, P J (2021) Reporting uncertainty for gas certified reference materials: balancing customer requirements with calibration and measurement capabilities. Accreditation and Quality Assurance, 26 (1). pp. 41-45. ISSN 0949-1775

Brewer, P J; Brown, R J C (2020) Benchmarking the success of CCQM key comparisons for metrology institutes and their stakeholders. Metrologia, 57 (6). 065018 ISSN 0026-1394

Brown, R J C; Brewer, P J (2020) What is a mole? Metrologia, 57 (6). 065002 ISSN 0026-1394

van der Veen, A M H; Zalewska, E T; van Osselen, D R; Fernández, T E; Gómez, C; Beránek, J; Oudwater, R J; Sobrinho, D C; Brum, M C; Augusto, C R; Fükö, J; Büki, T; Nagyné Szilági, Z; Brewer, P J; Downey, M L; Brown, R J C; Valkova, M; Durisova, Z; Arrhenius, K; Magnusson, B; Yaghooby, H; Tarhan, T; Engin, E; Konopelko, L A; Popova, T A; Pir, M N; Efremova, O V (2020) International comparison CCQM-K112 biogas. Metrologia, 57 (1A). 08011 ISSN 0026-1394

Brewer, P J; Gieseking, B; Ferracci, V F; Ward, M; Carroll, P; Bell, S; Hall, B (2020) International pilot study CCQM-P193: 10 μmol mol−1 water vapour in nitrogen. Metrologia, 57 (1A). 08015 ISSN 0026-1394

Rhoderick, G C; Cecelski, C E; Miller, W R; Worton, D R; Moreno, S; Brewer, P J; Viallon, J; Idrees, F; Moussay, P; Kim, Y D; Kim, D; Lee, S; Baldan, A; Li, J (2019) Stability of gaseous volatile organic compounds contained in gas cylinders with different internal wall treatments. Elem Sci Anth, 7 (1). 28 ISSN 2325-1026

Brewer, P J; Kim, J S; Lee, S; Tarasova, O A; Viallon, J; Flores, E; Wielgosz, RI; Shimosaka, T; Assonov, S; Allison, CE; van der Veen, A M H; Hall, B; Crotwell, A M; Rhoderick, G C; Hodges, J T; Mohn, J; Zellweger, C; Moossen, H; Ebert, V; Griffith, D W T (2019) Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations. Metrologia, 56 (3). 034006 ISSN 0026-1394

Hodges, J T; Viallon, J; Brewer, P J; Drouin, B J; Gorshelev, V; Janssen, C; Lee, S; Possolo, A; Smith, M A H; Walden, J; Wielgosz, R I (2019) Recommendation of a consensus value of the ozone absorption cross-section at 253.65 nm based on a literature review. Metrologia, 56 (3). 034001 ISSN 0026-1394

Brewer, P J; Brown, R J C; Mussell Webber, E B; Van Aswegen, S; Ward, M K M; Hill-Pearce, R E; Worton, D R (2019) Breakthrough in Negating the Impact of Adsorption in Gas Reference Materials. Analytical Chemistry, 91 (8). pp. 5310-5315. ISSN 0003-2700

Hill-Pearce, R E; Resner, K V; Worton, D R; Brewer, P J (2019) Synthetic Zero Air Reference Material for High Accuracy Greenhouse Gas Measurements. Analytical Chemistry, 91 (3). pp. 1974-1979. ISSN 0003-2700

Allen, N D C; Worton, D R; Brewer, P J; Pascale, C; Niederhauser, B (2018) The importance of cylinder passivation for preparation and long-term stability of multicomponent monoterpene primary reference materials. Atmospheric Measurement Techniques, 11 (12). pp. 6429-6438. ISSN 1867-8548

Brewer, P J; Downey, M L; Atkins, E; Brown, R J C; Brown, A S; Zalewska, E T; van der Veen, A M H; Smeulders, D E; McCallum, J B; Satumba, R T; Kim, Y D; Kang, N; Bae, H K; Woo, J C; Konopelko, L A; Popova, T A; Meshkov, A V; Efremova, O V; Kustikov, Y (2018) International comparison CCQM-K119 liquefied petroleum gas. Metrologia, 55 (1A). 08004 ISSN 0026-1394

Brewer, P J; Brown, R J C; Tarasova, O A; Hall, B; Rhoderick, G C; Wielgosz, R I (2018) SI traceability and scales for underpinning atmospheric monitoring of greenhouse gases. Metrologia, 55 (5). pp. S174-S181. ISSN 0026-1394

Brewer, P J; Brown, R J C; Resner, K V; Hill-Pearce, R E; Worton, D R; Allen, N D C; Blakley, K C; Benucci, D; Ellison, M R (2018) Influence of Pressure on the Composition of Gaseous Reference Materials. Analytical Chemistry, 90 (5). pp. 3490-3495. ISSN 0003-2700

Brewer, P J; Gieseking, B; Feracci, V F; Ward, M; van Wijk, J; van der Veen, A M H; Lima, A A; Augusto, C R; Oh, S H; Kim, B M; Lee, S; Konopelko, L A; Kustikov, Y; Shimosaka, T; Niederhauser, B; Guillevic, M; Pascale, C; Zhou, Z; Wang, D; Hu, S (2018) International comparison CCQM-K116: 10 μmol mol-1 water vapour in nitrogen. Metrologia, 55 (1A). 08018. ISSN 0026-1394

van der Veen, A M H; van der Hout, J W; Ziel, P R; Oudwater, R J; Fioravante, A L; Augusto, C R; Brum, M C; Uehara, S; Akima, D; Bae, H K; Kang, N; Woo, J-C; Liaskos, C E; Rhoderick, G C; Jozela, M; Tshilongo, J; Ntsasa, N G; Botha, A; Brewer, P J; Brown, A S; Bartlett, S; Downey, M L; Konopelko, L A; Kolobova, A V; Pankov, A A; Orshanskaya, A A; Efremova, O V (2017) International comparison CCQM-K111—propane in nitrogen. Metrologia, 54 (1A). 08009 ISSN 0026-1394

Arrhenius, K; Yaghooby, H; Rosell, L; Buker, O; Culleton, L; Bartlett, S; Murugan, A; Brewer, P J; Li, J R; van der Veen, A M H; Krom, I; Lestremau, F; Beranek, J (2017) Suitability of vessels and adsorbents for the short-term storage of biogas/biomethane for the determination of impurities - siloxanes, sulfur compounds, halogenated hydrocarbons, BTEX. Biomass Bioenergy, 105. pp. 127-135.

Brown, R J C; Brewer, P J; Kim, K H* (2017) Fixed volume sequential standard addition calibration: value assignment of impurities in zero gas. Chemometr. Intell. Lab. Syst., 164. pp. 52-55.

Brown, R J C; Brewer, P J; Harris, P M; Davidson, S; van der Veen, A M H*; Ent, H* (2017) On the traceability of gaseous reference materials. Metrologia, 54 (3). L11-L18

Curtis, E A; Barwood, G P; Huang, G; Edwards, C S; Gieseking, B; Brewer, P J (2017) Ultra-high-finesse NICE-OHMS spectroscopy at 1532 nm for calibrated online ammonia detection. J. Opt. Soc. Am. B, 34 (5). pp. 950-958.

Allen, N D C; Brewer, P J; Brown, R J C; Lipscombe, R P; Woods, P T (2016) International comparison of key volatile organic components in indoor air. Measurement, 82. pp. 476-481.

Minarro, M D*; Brewer, P J; Brown, R J C; Persijn, S*; van Wijk, J*; Nieuwenkamp, G*; Balden, A*; Kaiser, C*; Sutour, C*; Mace, T*; Skundric, N*; Tarhan, T* (2016) Zero gas reference standards. Anal. Methods, 8 (15). pp. 3014-3022.

Flores, E*; Viallon, J*; Choteau, T*; Moussay, P*; Wielgosz, R I*; Kang, N*; Kim, B M*; Zalewska, E*; van der Veen, A*; Konopelko, L*; Wu, H*; Han, Q*; Rhoderick, G*; Guenther, F R*; Watanabe, T*; Shimosaka, T*; Kato, K*; Hall, B*; Brewer, P J (2015) International comparison CCQM-K82: methane in air at ambient level (1800 to 2200) nmol/mol. Metrologia, 52 (1A). 08001.

Brewer, P J; Panagoulia, D; Brown, R J C; Tromans, A*; Reyes, A*; Arce, M*; Vospelova, A*; Rozikova, M*; Pratt, K W*; Asakai, T*; Jakobsen, P T*; Camoes, M F*; Oliveira, C S*; Godinho, I*; Spitzer, P*; Sander, B*; Mariassy, M*; Vyskocil, L*; Fisicaro, P*; Stoica, D*; Uysal, E* (2015) International comparison on Ag|AgCl electrodes for pH measurement. Measurement, 66. pp. 131-138.

Brown, R J C; Brewer, P J (2015) Proposals for nomenclature to clarify the expression of units for counting quantities. Metrologia, 52 (1). pp. L1-L3.

Brown, R J C; Brewer, P J; Ent, H*; Fisicaro, P*; Horvat, M*; Kim, K-H*; Quetel, C R* (2015) Who should take responsibility for decisions on internationally recommended datasets? The case of the mass concentration of mercury in air at saturation. Metrologia, 52 (5). L25-L30

Brewer, P J; Leach, A S*; Brown, R J C (2015) The role of the electrolyte in the fabrication of Ag|AgCl reference electrodes for pH measurement. Electrochim. Acta, 161. pp. 80-83.

Brewer, P J; Brown, R J C; Miller, M N; Minarro, M D; Murugan, A; Milton, M J T; Rhoderick, G C* (2014) Preparation and validation of fully-synthetic standard gas mixtures with atmospheric isotopic composition for global CO2 and CH4 monitoring. Anal. Chem., 86 (3). pp. 1887-1893.

Brewer, P J; Minarro, M D; di Meane, E A; Brown, R J C (2014) A high accuracy dilution system for generating low concentration reference standards of reactive gases. Measurement, 47. pp. 607-612.

Baldan, A*; Ent, H*; van der Veen, A M H*; Held, A*; Ulberth-Buchgraber, M*; Daroda, R J*; da Cunha, V S*; Wise, S A*; Schantz, M*; Brewer, P J; Brown, R J C (2013) The BIOREMA project - part 1: Towards international comparability for biofuel analysis. Accred. Qual. Assur., 18 (1). pp. 19-28.

Ulberth-Buchgraber, M*; Potalivo, M*; Held, A*; Baldan, A*; van der Veen, A M H*; Ent, H*; Cunha, V S*; Daroda, R J*; Lang, B*; Schantz, M*; Hearn, R*; Brown, R J C; Brewer, P J (2013) The BIOREMA project - part 2: International interlaboratory comparison for biodiesel test methods. Accred. Qual. Assur., 18 (1). pp. 29-39.

van der Veen, A M H*; Ent, H*; Baldan, A*; da Cunha, V S*; Daroda, R J*; Lang, B*; Schantz, M*; Ulberth-Buchgraber, M*; Held, A*; Hearn, R*; Brown, R J C; Brewer, P J (2013) The BIOREMA project - part 3: International interlaboratory comparison for bio-ethanol test methods. Accred. Qual. Assur., 18 (1). pp. 41-50.

Brewer, P J; di Meane, E A; Vargha, G M; Brown, R J C; Milton, M J T (2013) Gaseous reference standards of formaldehyde from trioxane. Talanta, 108. pp. 83-87.

Brown, R J C; Brewer, P J; Milton, M J T (2013) On the validity of acidity function extrapolation to zero added ionic strength and its impact on the uncertainty of primary pH measurements using the Harned cell. Measurement, 46 (5). pp. 1726-1733.

Brewer, P J; Goody, B A; Kumar, Y; Milton, M J T (2012) Accurate measurements of water vapour transmission through high-performance barrier layers. Rev. Sci. Instrum., 83 (7). 075118

Brewer, P J; Leese, R J*; Brown, R J C (2012) An improved approach for fabricating Ag/AgCl reference electrodes. Electrochim. Acta, 71. pp. 252-257.

Stoica, D*; Brewer, P J; Brown, R J C; Fisicaro, P* (2011) Influence of fabrication procedure on the electrochemical performance of Ag/AgCl reference electrodes. Electrochim. Acta, 56 (27). pp. 10009-10015.

Brewer, P J; Stoica, D*; Brown, R J C (2011) Sensitivities of key parameters in the preparation of silver / silver chloride electrodes used in harned cell measurements of pH. Sensors, 11 (8). pp. 8072-8084.

Brewer, P J; Goody, B A; Woods, P T; Milton, M J T (2011) A dynamic gravimetric standard for trace water. Rev. Sci. Instrum., 82 (10). 105102

Esward, T J; Knox, S; Jones, H*; Brewer, P J; Murphy, C E; Wright, L; Williams, J (2011) A metrology perspective on the dark injection transient current method for charge mobility determination in organic semiconductors. J. Appl. Phys., 109 (9). 093707

Brewer, P J; Brown, R J C (2010) Effect of silver annealing conditions on the performance of electrolytic silver/silver chloride electrodes used in harned cell measurements of pH. Sensors, 10 (3). pp. 2202-2216.

Brewer, P J; Goody, B A; Gillam, T*; Brown, R J C; Milton, M J T (2010) High-accuracy stable gas flow dilution using a self-calibrating network of critical flow orifices. Meas. Sci. Technol., 21 (11). 115902

Halliday, J*; Lewis, A C*; Hamilton, J F*; Rhodes, C*; Bartle, K D*; Homewood, P*; Grenfell, R J P; Goody, B A; Harling, A M; Brewer, P J; Vargha, G; Milton, M J T (2010) Lab-on-a-chip GC for environmental research. LC GC Europe, 23 (10). p. 514.

Brown, R J C; Keates, A C*; Brewer, P J (2010) Sensitivities of a standard test method for the determination of the pHe of bioethanol and suggestions for improvement. Sensors, 10 (11). pp. 9982-9993.

Brewer, P J; Brown, R J C (2009) Effect of structural design of silver/silver chloride electrodes on stability and response time and the implications for improved accuracy in pH measurement. Sensors, 9 (1). pp. 118-130.

Brown, R J C; Brewer, P J; Brett, D J L* (2009) Long-term equilibrium potential and electrochemical impedance study of Ag/AgCl electrodes used in Harned Cell measurements of pH. Accred. Qual. Assur., 14 (3). pp. 139-145.

van Poll, M L*; Khodabakhsh, S*; Brewer, P J; Shard, A G; Ramstedt, M*; Huck, W T S* (2009) Surface modification of PDMS via self-organization of vinyl-terminated small molecules. Soft Matter, 5 (11). pp. 2286-2293.

Shard, A G; Green, F M; Brewer, P J; Seah, M P; Gilmore, I S (2008) Quantitative molecular depth profiling of organic delta-layers by C-60 ion sputtering and SIMS. J. Phys. Chem. B, 112 (9). pp. 2596-2605.

Coleman, M D; Brewer, P J; Smith, I M; Harris, P M; Clift, M G; Milton, M J T (2007) Calibration transfer strategy to compensate for instrumental drift in portable quadrupole mass spectrometers. Anal. Chim. Acta, 601 (2). pp. 189-195.

Shard, A G; Brewer, P J; Green, F M; Gilmore, I S (2007) Measurement of sputtering yield and damage in C60 sims depth profiling of model organic materials. Surf. Interface Anal., 39. pp. 294-298.

Shard, A G; Brewer, P J; Green, F M; Gilmore, I S (2007) Measurement of sputtering yields and damage in C60 SIMS depth profiling of model organic materials. Surf. Interface Anal., 39. pp. 294-298.