High-Volume Air Sampler for Particle and Gas Sampling.2.Use of Backup Filters To Correct for the Adsorption of Gas-Phase Polycyclic Aromatic Hydrocarbons to the Front Filter

Vertical Distribution and Potential Risk of Particulate Polycyclic Aromatic Hydrocarbons in High Buildings of Bangkok, Thailand

“…Phe, An, Fluo, Pyr, 11H-B[a]F, 11H-B[b] F, B[a]A, Chry), which are categorized as semi-volatile organic compounds (SVOCs). The adsorption of gaseous SVOCs onto a filter can cause positive biases in the measured particle-phase concentrations, and negative biases in the measured gas-phase concentrations (McDow and Huntzicker, 1990;Hart and Pankow, 1994;Turpin and Huntzicker, 1994). In order to investigate the sampling artefact effect, gas/particle partitioning can be parameterised using the coefficient K p (m 3 μg -1 ):…”

Estimating ambient particulate organic carbon concentrations and partitioning using thermal optical measurements and the volatility basis set

“…The Q-QBQ approach is thus not ideal for short-duration studies such as ours. However, at high exposure the Q-QBQ approach provides robust estimates of the POC concentration (Hart and Pankow 1994) while the Q-QBT approach may overestimate the positive artifact (Turpin et al 1994;Kim et al 2001;Subramanian et al 2004) because of volatilization of semi-volatile organics from the front Teflon filter (part of the negative artifact). Consequently, for long sampling periods (>3 h), the Q-QBQ approach provides a more reasonable estimate of the positive artifacts on the front quartz filter while the Q-QBT approach only provides an upper limit of positive artifacts.…”

“…Semi-volatile organics have historically been regarded as a source of bias in OC/EC filter samples, and the BQ, QBT sampling strategy was developed to help correct for this bias, under the assumption that, for the most part, OC collected on QBT filter is related to semi-volatile vapor adsorption to the quartz filter (Hart and Pankow 1994). We are interested in treating the partitioning information as a signal rather than a source of bias.…”

Fingerprint of Carcinogenic Semi-Volatile Organic Compounds (SVOCs) during Bonfire Night

“…Moreover, PUF plugs have been widely employed as a sorbent for gas phase SVOCs trapping material because of its relatively low price, low blank values and ease of cleaning and handling. However, the exchange of SOVCs between the gaseous and particulate phases can cause both positive and negative sampling artifacts (Hart and Pankow, 1994). These artifacts can lead either to underestimation or overestimation of ambient concentrations.…”

“…The sorption of gas-phase PAHs to filter surfaces (filter sorption artifact) is known to lead to artificially high measured F values and low measured A values, resulting in an artificially high F/A ratios (Hart and Pankow, 1994), while the PAHs maybe stripped from filter particles (blowoff or volatilisation artifact) and then collected on the gas-sampling adsorbent downstream of the filter to cause artificially low F/A ratios (Biddleman et al, 1986;Hart and Pankow, 1994;Peters et al, 2000). Therefore, losses of the more volatile compounds due to the high-pressure drop across the collecting filter can cause an underestimation of particle concentration, especially for longer sampling times.…”