Table 2. Optimization parameters and levels of SPME technology

Optimization	Levels of optimization parameter
NaCl addition (g)	0.0	0.5	1.0	1.5	2.0
Heating temperature (°C)	40	50	60	70	80
Extraction time (min)	10	20	30	40	50
Dissociation time (min)	1	3	5	7	10