Horizontal bubble train apparatus for heterogeneous chemistry studies: uptake of gas-phase formaldehyde

Article Abstract:

A new horizontal bubble train apparatus was developed to determine the different heterogenous gas-liquid interactions, particularly the uptake of gas-phase formaldehyde. The system operates with aqueous solutions and even concentrated sulfuric acid. Liquids are pumped through the apparatus' quartz tube at a controlled speed of 15-35 cm/s. From there, the liquid are examined for heterogenous gas-liquid interactions which involve the injection of a low-pressure gas flow and the subsequent sampling by a differentially pumped spectrometer. Results from the modeling indicate that pH and NaCl concentration play key roles in the uptake of formaldehyde.

Chemistry, Models, Atmospheric chemistry, Gas research, Gaseous fuels research

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Trifluoroacetate, an atmospheric breakdown product of hydrofluorocarbon refrigerants: biomolecular fate in aquatic organisms

Article Abstract:

Hydrofluorocarbons have been found to have different effects in aquatic organisms with some having high capabilities of metabolically transforming the chemical to other sources while some retaining it in their bodies in its original state. Aquatic communities in different trophic levels were tested against radioactive triflouroacetate and were found to be most abundant in oligochaetes and I. capensis and least abundant in aerobic bacteria.

Industrial Organic Chemicals, Fluorocarbons, Environmental aspects, Hydrofluorocarbons, Aquatic animals

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Detection and estimation of part-per-billion levels of formaldehyde using a portable high-throughput liquid absorption air sampler

Article Abstract:

The portable high-throughput liquid absorption air sampler (PHTLAAS) proved effective in detecting and estimating part-per-billion levels of formaldehyde. PHTLAAS is simple and fast and demonstrated formaldehyde collection efficiencies of about 50 and 40% at formaldehyde concentrations of 16 and 45 ppbv/v, respectively.

Analysis, Usage, Air sampling apparatus, Air sampling equipment

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