LaMotte SMART3 Soil Operator's Manual page 110

RANGE:
METHOD:
INTERFERENCES:
ZINC
1.800.544.2843
0.00–15.00 ppm Zinc
Zinc forms a blue colored complex with Zincon in a solution
buff ered at pH 9.0. Other heavy metals are complexed by
cyanide and the zinc cyanide complex is released by the
addition of formaldehyde before the other metal cyanide
complexes are destroyed. Sodium ascorbate is added to
reduce the interference of manganese.
The following ions interfere in concentrations greater than
those listed.
Ion mg/L
Cd(II) 1
Al (III) 5
Mn (II) 5
Fe (III) 7
Fe (II) 9
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15
10 20
5 25
0 30
Ion mg/L
Cr(III) 10
Ni(II) 20
Co (II) 30
CrO4(II) 50
Smart3 Soil Test Procedures 9.18
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