Table 3. Source profiles of PFASs obtained from the PCA-MLR and PMF models.

Compound	PCA factor loadings		PMF source composition (ng/g dw)
	Factor 1	Factor 2	Source 1	Source 2	Source 3
PFBA	−0.015	0.719	0.0034	0.0000	0.0509
PFPeA	0.027	0.900	0.0000	0.0034	0.0316
PFHxA	0.366	0.766	0.0000	0.0045	0.0317
PFHpA	0.730	0.461	0.0058	0.0034	0.0122
PFOA	0.823	0.202	0.0756	0.0454	0.0471
PFNA	0.698	0.247	0.0570	0.0022	0.0093
PFDA	0.862	0.154	0.0468	0.0290	0.0038
PFUnDA	0.900	0.034	0.1124	0.0197	0.0067
PFDoDA	0.951	0.068	0.0140	0.0116	0.0002
PFTrDA	0.903	0.100	0.0332	0.0097	0.0021
PFTeDA	0.834	0.015	0.0033	0.0034	0.0000
PFOS	0.674	0.028	0.0224	0.1602	0.0072
Possible source	Food-packaging, textile, electroplating, firefighting and semiconductor industry	Precious metals and coating industry	Food-packaging industry	Textile, electroplating, firefighting and semiconductor industry	Precious metals and coating industry
Contribution (%)	77.7	22.3	43.2	33.6	23.2