Novel gas exposure system for the controlled exposure of plants to gaseous hydrogen fluoride.

Autor: DeMille KF; NewFields Environmental Forensics Practice, LLC, 300 Ledgewood Place, Suite 205, Rockland, MA, 02370, USA. Kdemille@newfields.com., Emsbo-Mattingly SD; NewFields Environmental Forensics Practice, LLC, 300 Ledgewood Place, Suite 205, Rockland, MA, 02370, USA., Krieger G; NewFields E&E, Longmont, CO, 80503, USA., Howard M; Mission Support and Test Services, LLC, Las Vegas, NV, 89193, USA., Webster KB; University of Massachusetts Amherst, 310 Paige Laboratory, 161 Holdsworth Way, Amherst, MA, 01003, USA., DaCosta M; University of Massachusetts Amherst, 310 Paige Laboratory, 161 Holdsworth Way, Amherst, MA, 01003, USA.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2023 May 29; Vol. 195 (6), pp. 752. Date of Electronic Publication: 2023 May 29.
DOI: 10.1007/s10661-023-11382-8
Abstrakt: Plants can serve as sensitive bioindicators of the presence of contaminant vapors in the atmosphere. This work describes a novel laboratory-based gas exposure system capable of calibrating plants as bioindicators for the detection and delineation of the atmospheric contaminant hydrogen fluoride (HF) as a preparatory step for monitoring release emissions. To evaluate changes in plant phenotype and stress-induced physiological effects attributed to HF alone, the gas exposure chamber must have additional controls to simulate otherwise optimal plant growth conditions including variables such as light intensity, photoperiod, temperature, and irrigation. The exposure system was designed to maintain constant growth conditions during a series of independent experiments that varied between optimal (control) and stressful (HF exposure) conditions. The system was also designed to ensure the safe handling and application of HF. An initial system calibration introduced HF gas into the exposure chamber and monitored HF concentrations by cavity ring-down spectroscopy for a 48-h period. Stable concentrations inside the exposure chamber were observed after approximately 15 h, and losses of HF to the system ranged from 88 to 91%. A model plant species (Festuca arundinacea) was then exposed to HF for 48 h. Visual phenotype stress-induced responses aligned with symptoms reported in the literature for fluoride exposure (tip dieback and discoloration along the dieback transition margin). Fluoride concentrations in exposed tissues compared to control tissues confirmed enhanced fluoride uptake due to HF exposure. The system described herein can be applied to other reactive atmospheric pollutants of interest in support of bioindicator research.
(© 2023. The Author(s).)
Databáze: MEDLINE
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