Online Solid-Phase Extraction LC-MS/MS: A Rapid and Valid Method for the Determination of Perfluorinated Compounds at Sub ng·L⁻¹ Level in Natural Water

Table 6

Matrix effect index for all analytes.

Analyte	ME index
PFBA	−1.4
PFPeA	4.5
PFBS	1.7
PFHxA	−2.2
PFHpA	−0.67
PFHxS	5.1
PFOA	−0,20
PFNA	−1.7
PFOS	0.08
PFDA	−0.64
PFUnDA	−2.4
PFDoDA	−6.8