residual solvents, in accordance
organic volatile impurities, complies (GC)
≤0.00002% Al
≤0.0005% heavy metals (as Pb)
≤0.001% free acid (as HCl)
potassium hexacyanoferrate(II), in accordance
≤0.002% free alkali (as NaOH)
acidity or alkalinity, in accordance
≤0.0001% potassium hexacyanoferrate(II)
≤0.01% Mg and alkaline earth metals (as Ca)