P-IV metal solution:
Na₂EDTA 2H₂O 0.75 g
FeCl₃ 6H₂O 0.097 g
MnCl₂ 4H₂O 0.041 g
ZnCl₂ 0.005 g
CoCl₂ 6H₂O 0.002 g
Na₂MoO₄ 2H₂O 0.004 g
Deionized water to 1 L

To approximately 950 ml of dH₂O, add ingredients in order listed stirring continuously. The EDTA should be fully dissoled before adding other components. Bring to 1 L with dH₂O and store at 4 C.

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