Reproducibility of the Quantification of Reversible Wall Interactions in VOC Sampling Lines

Volatile Organic Compounds (VOCs) are widely measured at ppb and ppt level in many contexts, from therapeutic drug control respiratory diseases to monitoring of climate change indoor air quality. The need for accuracy is a common denominator all these fields. interactions between gas mixtures solid surfaces sampling lines instruments play an important role calculating the total uncertainty amount VOC. substances mixture affected by its reversible irreversible with line. main aim this paper propose discuss method quantify substance segregated on lines. To validate proposed method, areic VOC (Acetone) commercial test pipe (Sulfinert®) as per unit area internal surface flowing mixture. Stainless steel coated Sulfinert® was chosen material because wide use limited permeation effects. A certified Acetone nominal mole fraction 10 µmol mol−1 used validation. Broad temperature sensibility pressure has been evaluated correct bias due physical condition. sensitivity residence time Reynolds number flow verify reaching equilibrium limits applicability method. 40 nmol m−2, constant value around 0.2 m calculated ratio superficial wall concentration mixture, both equilibrium. observed reproducibility better than 2.5%. This aimed investigate losses VOC/material systems lower levels.