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 2

Elution conditions employed in Gemini HPLC Column.

Time (min)	Flow (mL·min^−1)	% eluent A Milli-Q water loading	% eluent B water/methanol 50 : 50 w/w water	Valve
0.0	1.6	100	0	A: exhaust
3.5	1.6	100	0	B: column
6.5	1.6	100	0	B: column
8.0	1.6	100	0	B: column
8.5	1.6	0	100	A: discharge
8.6	1.6	0	100	A: discharge
9.5	1.6	0	100	A: discharge
10.0	1.6	100	0	A: exhaust
12.0	End