CHROMABOND QuEChERS Mix I citrate extraction mix consisting of: – 4 g MgSO4 – 1 g NaCl – 0.5 g Na2H citrate x 1.5 H2O – 1 g Na3 citrate x 2 H2O individually weighed and filled into 15 mL centrifuge tubes (PP) with screw cap (PE) pack of 50