Impacts of refrigerant usage on the environmental presence of trifluoroacetic acid and other persistent chemicals (T10-Q05)

Phase:	Theme
Theme:	Land / Water (T10)
StatusStatut:	Active
Start DateDate de début:	2024-04-01
End DateDate de fin:	2026-08-31

Aperçu de Project Overview

Heat pumps are energy-efficient alternatives to traditional air conditioners that function by using refrigerants. New refrigerants have been introduced to protect the ozone layer and reduce greenhouse gases. Newer refrigerants degrade quickly in the environment, however, they form the highly persistent and potentially toxic trifluoroacetic acid (TFA). This work investigates the fate of TFA formed as degradation products of past and present-use refrigerants. We use remote ice cores to gain historical trends of TFA deposition from atmospheric sources, to obtain a baseline of previous contamination, and see how recent changes in usage have increased concentrations over the past 5 years. Laboratory studies will probe two poorly understood reactions that impact environmental TFA: 1) hydrolysis of haloacetyl fluorides, important intermediates in the gas-phase formation of TFA from refrigerant gases; 2) photochemical oxidation of TFA as a potential, but slow, loss mechanism in the environment.

Outputs

Title	Category	Date	Authors
Aquatic environmental fate of the rubber additive diphenyl guanidine (DPG)	Activity	2025-11-18	Nipuna Senanayake, "Samantha Burke", "Summer Scott", Shira Joudan
Aquatic fate of aryl-CF3 contaminants: Persistence, defluorination, and formation of TFA	Activity	2025-08-20	Shira Joudan, Zhefei Guo, "Genevieve Tremblay"
Aquatic fate of aryl-CF3 contaminants: Persistence, defluorination, and formation of TFA	Activity	2025-12-19	Shira Joudan, Zhefei Guo, "Genevieve Tremblay"
Aqueous Photochemical Formation of Trifluoroacetic Acid: Mechanistic Insights into Aryl-CF3 Compoundsstudent oral presentation	Activity	2025-03-24	Zhefei Guo, Shira Joudan
Detection and quantification of 25 PFAS species with LC-MS/MS: Method development for analysis of wastewater sediments from Calgary, Alberta, Canada. student poster presentation	Activity	2024-06-17	Danielle Molenaar, Shira Joudan
Exploring the environmental fate of haloacetic acids and ultrashort chain PFAS	Activity	2025-06-20	Azka Attar, Shira Joudan
Formation of TFA from aqueous photochemistry of aryl-CF3 agrochemicals and pharmaceuticals	Activity	2025-11-17	Shira Joudan, Zhefei Guo, "Genevieve Tremblay"
Formation of trifluoroacetic acid from photochemical reactions of aryl-CF3 compoundsPI poster presentation	Activity	2024-06-26	Shira Joudan, Zhefei Guo
Multiple pathways of releasing fluorine: formation of trifluoroacetic acid and spontaneous defluorination from the aqueous photolysis of aryl-CF3 compounds.Student oral presentation.	Activity	2024-06-04	Zhefei Guo, Shira Joudan
Multiple pathways of releasing fluorine: formation of trifluoroacetic acid and spontaneous defluorination from the aqueous photolysis of aryl-CF3 compounds. student oral presentation	Activity	2024-06-17	Zhefei Guo, Shira Joudan
Per- and polyfluoroalkyl substances in soft-shell clams from urban and remote regions in Nunavut: Understanding sources of PFAS in the Canadian Arctic.	Activity	2025-11-18	Danielle Molenaar, Shira Joudan
Trifluoroacetic acid (TFA) in the environment: Complexities of the smallest ‘forever chemical’	Activity	2024-10-25	Shira Joudan
Understanding environmental reactions of PFAS and other contaminants for a more sustainable world	Activity	2026-01-23	Shira Joudan
Understanding environmental reactions of PFAS and other contaminants for a more sustainable world	Activity	2026-01-30	Shira Joudan
Unmasking TFA: The environmental journey of organofluorine compounds.	Activity	2025-08-18	Shira Joudan
Why Some Chemicals Last Forever and How We Can Do Better	Activity	2026-01-21	Shira Joudan

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Impacts of refrigerant usage on the environmental presence of trifluoroacetic acid and other persistent chemicals (T10-Q05)

From FES Forum

Impacts of refrigerant usage on the environmental presence of trifluoroacetic acid and other persistent chemicals (T10-Q05)

Aperçu de Project Overview

Outputs