PFASs	per- and polyfluoroalkyl substance
PFAS acronyms	See Table A3
EU	European Union
WFD	Water Framework Directive
PFOS	perfluorooctane sulfonic acid
AA-EQS	annual average environmental quality standard
EQS	environmental quality standard
PFOA	perfluorooctanoic acid
RPF	relative potency factors
PFOA-eq.	perfluorooctanoic acid equivalents
EOF	extractable organic fluorine
TTR	transthyretin (thyroxine transport protein)
T4	thyroxine (thyroid hormone)
BEQ	biological equivalence concentrations
LC	liquid chromatography
ESI	electrospray ionization
MS	mass spectrometry
CIC	combustion ion chromatography
EBT	effect-based trigger value
WWTP	wastewater treatment plant
MQ	mean annual discharge
W	water level
Q	discharge
WAX	weak anion exchange
SPE	solid phase extraction
R2	coefficient of determination
LOD	limit of detection
LOQ	limit of quantification
TRβ	thyroid-receptor
CALUX	chemical activated luciferase gene expression
PC80	concentration at 80% sample activity compared to PFOA response
TFA	trifluoroacetic acid
C6O4	2,2-difluoro-2-([2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy)acetic acid
PFOA-EQ	PFOA-equivalent concentrations
PFOA-BEQ	PFOA biological equivalence concentrations (determined with bioassay)
PFOA-TEQ	PFOA-equivalent concentrations (calculated using in vivo RPF)
PFOA-CEQ	PFOA-equivalent concentrations (calculated using in vitro RPF)
TRuhr	trend of parameter in the river Ruhr (simple linear regression)
F	fluorine
SD	standard deviation