Perfluorohexanoic acid

Perfluorohexanoic acid
Names
	IUPAC name 2,2,3,3,4,4,5,5,6,6,6-undecafluorohexanoic acid
	Other names methyl undecafluorohexanoate
Identifiers
CAS Number	307-24-4;
3D model (JSmol)	Interactive image;
Abbreviations	PFHxA
ChEBI	CHEBI:83492;
ECHA InfoCard	100.005.634
EC Number	206-196-6;
PubChem CID	67542;
UNII	ZP34Q2220R;
CompTox Dashboard (EPA)	DTXSID3031862 ;
	InChI InChI=1S/C6HF11O2/c7-2(8,1(18)19)3(9,10)4(11,12)5(13,14)6(15,16)17/h(H,18,19) Key: PXUULQAPEKKVAH-UHFFFAOYSA-N;
	SMILES C(=O)(C(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)F)O;
Properties
Chemical formula	C6HF11O2
Molar mass	314.054 g·mol−1
Appearance	Colorless liquid
Density	1.757 g/cm3[1]
Boiling point	157 °C (314.6 °C; 430 K)[2]
log P	3.48 [2]
Vapor pressure	1.98 mm Hg [2]
Atmospheric OH rate constant	5.2 10−13 cu cm/molec sec [2]
Acidity (pKa)	-0.16 [2]
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P264, P280, P301+P330+P331, P303+P361+P353, P304+P340+P310, P305+P351+P338+P310, P363, P405, P501
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	140 mg/L (B. calyciflorus over 24hrs)
Safety data sheet (SDS)	[1]
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Perfluorohexanoic acid (PFHxA) is a fluorinated carboxylic acid derivative of hexanoic acid. Fluorinated polymers with six carbon or less commonly degrade into perfluorohexanoic acid.[3]

Perfluorohexanoic acid has been found to rapidly bioaccumulate.[3]

In 2020 Michigan adopted drinking water standards for 5 previously unregulated PFAS compounds including PFHxA which has a maximum contaminant level (MCL) of 400 parts per billion (ppb).[4][5]

References

"SAFETY DATA SHEET Perfluorohexanoic acid". Sigmaaldrich. August 3, 2021. Retrieved April 5, 2022.
PubChem. "Perfluorohexanoic acid". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-04-05.
Zahid, Muhammad; Heredia-Guerrero, Jose A.; Athanassiou, Athanassia; Bayer, Ilker S. (July 2017). "Robust water repellent treatment for woven cotton fabrics with eco-friendly polymers". Chemical Engineering Journal. 319: 321–332. doi:10.1016/j.cej.2017.03.006.
Matheny, Keith (3 August 2020). "Michigan's drinking water standards for these chemicals now among toughest in nation". Detroit Free Press. Archived from the original on 31 January 2022. Retrieved 31 March 2022.
"New state drinking water standards pave way for expansion of Michigan's PFAS clean-up efforts". Michigan.gov. 3 August 2020. Archived from the original on 3 January 2022. Retrieved 5 April 2022.

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[Sigma-1] "SAFETY DATA SHEET Perfluorohexanoic acid". Sigmaaldrich. August 3, 2021. Retrieved April 5, 2022.

[PubChem-2] PubChem. "Perfluorohexanoic acid". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-04-05.

[:0-3] Zahid, Muhammad; Heredia-Guerrero, Jose A.; Athanassiou, Athanassia; Bayer, Ilker S. (July 2017). "Robust water repellent treatment for woven cotton fabrics with eco-friendly polymers". Chemical Engineering Journal. 319: 321–332. doi:10.1016/j.cej.2017.03.006.

[4] Matheny, Keith (3 August 2020). "Michigan's drinking water standards for these chemicals now among toughest in nation". Detroit Free Press. Archived from the original on 31 January 2022. Retrieved 31 March 2022.

[5] "New state drinking water standards pave way for expansion of Michigan's PFAS clean-up efforts". Michigan.gov. 3 August 2020. Archived from the original on 3 January 2022. Retrieved 5 April 2022.