Physical performances and kinetics of evaporation of the CIP 10-M personal sampler's rotating cup containing aqueous or viscous collection fluid

Abstract

The CIP 10-M personal sampler measures worker exposure to airborne particles by collecting particles in a rotating metal cup containing a few milliliters of a collection fluid. This device is mainly used to sample microorganisms or microbial components to measure bioaerosol concentrations in various occupational environments. Aqueous liquids are generally used, but their rapid evaporation limits the duration of sampling; alternative collection fluids could alleviate this problem. Indeed, the particle-collection efficiency of the rotating cup has not been extensively studied, and the only data available relate to a discontinued model. This study aimed to measure the collection efficiency of the current rotating cup model containing an aqueous (water) or viscous (ViaTrap mineral oil) collection fluid. The kinetics of evaporation confirmed that ViaTrap does not evaporate, making 8-h sampling campaigns in constant volumes feasible. Particles with a wide range of aerodynamic diameters (between around 0.1 and 10 mm) were produced using various test rigs and mono-or polydisperse test aerosols. Both new and older cup models performed similarly, with a collection efficiency of >80% for larger particles (aerodynamic diameters >2.8 mm), progressively decreasing to around 50% for aerodynamic diameters of 2.1 mm; with aerodynamic diameters of <1 mm, the collection efficiency was generally <10%. In physical terms, collection efficiency was unaffected by the type (aqueous or viscous) or volume (between 0 and 3 mL) of collection fluid used. Bias maps indicated that the inhalable fraction may be underestimated in occupational settings, particularly with aerosols mainly composed of particles with aerodynamic diameters of less than around 3 mm. EDITORTiina Reponen

Bioaerosol Exposure during Sorting of Municipal Solid, Commercial and Industrial Waste: Concentration Levels, Size Distribution, and Biodiversity of Airborne Fungal

“…For sampling with the MCI and the CFC, the flow rate of the device (sampling head connected to a pump) was calibrated and measured before and after sampling using a soap film bubble flowmeter (Gilian, Gilibrator, St. Petersburg, FL, USA-2 L/min) or a mass flow meter (Mass Flow Meter 4140, TSI Inc., Shoreview, MN, USA). For sampling with the CIP-I, the flow rate was controlled with an optical tachymeter before and after each sampling day, as described previously [25].…”

Recent Advances in Monitoring, Sampling, and Sensing Techniques for Bioaerosols in the Atmosphere

“…Nonetheless, personal samplers have been extensively used for collection of bioaerosols in the case of personal bioaerosol exposure. 59,60 On the other hand, the performance of high-samplingvolume samplers (e.g., impactors and impingers) depends upon the following: (a) the inertial properties of the bioaerosol particle (e.g., density, mass median aerodynamic diameter (MMAD), and velocity) and (b) physical attributes of the sampling device (e.g., the inlet nozzle volume and the airflow passage). 61 Among particles of similar density, larger particles are suggested to lose their velocity and impacting momentum relative to smaller particles upon impacting a curve in a cylindrical pipe.…”

“…In comparison with personal or low-sampling-volume samplers, large-sampling-volume samplers are characterized by their ability to capture larger volumes of air samples over identical experimental duration. The flow rates of low- and high-sampling-volume samplers lie in the ranges of ∼2–10 and 15–800 L min –1 , respectively. , In the case of longer sampling durations, personal samplers may suffer from reduced sampling efficiency owing to desiccation of the pathogen. Nonetheless, personal samplers have been extensively used for collection of bioaerosols in the case of personal bioaerosol exposure. , …”

“…The flow rates of low- and high-sampling-volume samplers lie in the ranges of ∼2–10 and 15–800 L min –1 , respectively. , In the case of longer sampling durations, personal samplers may suffer from reduced sampling efficiency owing to desiccation of the pathogen. Nonetheless, personal samplers have been extensively used for collection of bioaerosols in the case of personal bioaerosol exposure. , …”