Trace metals stock solution

4.84 g Na₂EDTA•2H₂O

2.30 g ZnSO₄•7H₂O

1.11 g H₃BO₃

0.51 g MnCl₂•4H₂O

0.17 g CoCl₂•6H₂O

0.15 g CuSO₄•5H₂O

0.10 g (NH₄)₆Mo₇O₂₄•4H₂O

To prepare a 10,000X stock solution of trace metals, add the above ingredients to 75 mL of H₂O; adjust pH to 6.5 and volume to 100 mL. Freeze aliquots at −20°C.