Evaluation and statistical analysis of the modified QuEChERS method for the extraction of pinoxaden from environmental and agricultural samples

Journal of Analytical Science and Technology

Table 1 Effect of mass of different reagent on various QuEChERS methods

No.	Reagent	Mass range used (g)	Optimum mass (g)	Remarks
1.	Magnesium sulfate (MgSO₄)	1.0–8.0	2.0	^a
2.	Sodium chloride (NaCl)	0.5–4.0	2.0	^a
3.	Sodium acetate (CH₃COONa)	0.5–6.0	5.0	^b
4.	Trisodiumcitrate dihydrate HOC(COONa)(CH₂COONa)₂·2H₂O	0.25–2.0	1.5
5.	Disodiumhydrogencitrate sesquihydrate (Na₂HC₆H₅O₇(H₂O)_1.5)	0.25–2.0	0.5

^aMinimum miscibility and maximum phase separation at optimum concentration of ions of the respective salt lead to maximum recovery. Beyond the optimum the ions saturated system causes the analyte to be water soluble leading to a decrease in the recovery
^bMaximum buffering action at optimum mass where the PXD molecules are preserved against degradation results in optimum recovery