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Development of Primary Standard Gas Mixtures for Monitoring Monoterpenes (α-pinene, 3-carene, R-(+)-limonene, 1,8-cineole) Ambient Levels (at 2 nmol/mol)

대기 중 모노테르펜 (α-피넨, 3-카렌, R-리모넨, 1,8-시네올) 측정을 위한 혼합표준가스개발

  • Kang, Ji Hwan (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Kim, Mi Eon (Center for Gas Analysis, Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science (KRISS)) ;
  • Kim, Young Doo (Center for Gas Analysis, Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science (KRISS)) ;
  • Rhee, Young Woo (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Lee, Sangil (Center for Gas Analysis, Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science (KRISS))
  • 강지환 (충남대학교 바이오응용화학과 화학공학) ;
  • 김미언 (한국표준과학연구원) ;
  • 김용두 (한국표준과학연구원) ;
  • 이영우 (충남대학교 바이오응용화학과 화학공학) ;
  • 이상일 (한국표준과학연구원)
  • Received : 2016.03.30
  • Accepted : 2016.04.18
  • Published : 2016.06.30

Abstract

Among biogenic volatile organic compounds (BVOCs) in the natural ecosystem, monoterpenes, along with isoprene, play important roles in atmospheric chemistry and make significant impacts on air pollution and climate change, especially due to their contribution to secondary organic aerosol production and photochemical ozone formation. It is essential to measure monoterpene concentrations accurately for understanding their oxidation processes, emission processes and estimation, and interactions between biosphere and atmosphere. Thus, traceable calibration standards are crucial for the accurate measurement of monoterpenes at ambient levels. However, there are limited information about developing calibrations standards for monoterpenes in pressured cylinders. This study describes about developing primary standard gas mixtures (PSMs) for monoterpenes at about 2 nmol/mol, near ambient levels. The micro-gravimetric method was applied to prepare monoterpene (${\alpha}$-pinene, 3-carene, R-(+)-limonene, 1,8-cineole) PSMs at $10{\mu}mol/mol$ and then the PSMs were further diluted to 2 nmol/mol level. To select an optimal cylinder for the development of monoterpene PSMs, three different kinds of cylinders were used for the preparation and were evaluated for uncertainty sources including long-term stability. Results showed that aluminum cylinders with a special internal surface treatment (Experis) had little adsorption loss on the cylinder internal surface and good long-term stability compared to two other cylinder types with no treatment and a special treatment (Aculife). Results from uncertainty estimation suggested that monoterpene PSMs can be prepared in pressured cylinders with a special treatment (Experis) at 2 nmol/mol level with an uncertainty of less than 4%.

Keywords

Monoterpenes (${\alpha}$-pinene, 3-carene, R-(+)-limonene, 1,8-cineole);Calibration standard;Primary standard gas mixture;BVOC

Acknowledgement

Grant : 대기환경 측정표준 기술개발

Supported by : 국가과학기술연구회

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