What Is the Standard Specification of Ammonium Metatungstate?

Grade AMT-1 AMT-2
Purity Min.(wt. %) 99.95 99.90
WO3 MIN.(wt. %) 83.0 83.0
Impurity Max.(wt.%)
Al 0.001 0.001
As 0.001 0.001
Bi 0.0001 0.0001
Ca 0.001 0.003
Cr 0.001 0.001
Cu 0.001 0.003
Fe 0.002 0.003
K 0.0015 0.002
Mg 0.001 0.002
Mn 0.001 0.001
Mo 0.005 0.01
Na 0.0015 0.002
Ni 0.001 0.001
P 0.001 0.003
Pb 0.0001 0.0001
S 0.0005 0.001
Sb 0.001 0.002
Si 0.001 0.002
Sn 0.0001 0.0003
Ti 0.001 0.002
V 0.001 0.002
Insoluble in water 0.5 0.5
PH value 3.0-4.5 3.0-4.5
     

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