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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