Polymers ====================== Ba(barium) -------------------- Typical range 0-0.1% ----------------- Interferences
Barium is partially ionized in the nitrous oxide-acetylene flame. To suppress ionization add potassium chloride to give a final concentration of 5000ug/ml potassium in solution. -------------------------
Sample preparation
Refer to preparation recommended for cadmium in polymers. ----------------------------
Standard preparation Two sets of calibration standards are required for this determination: a)0-40ug/ml Ba in dilute H2SO4(硫酸) b)0-40ug/ml Ba in EDTA/NaOH solution. Add 5000ug/ml potassium as ionization suppressant to the acid solutions. Presence of sodium from NaOH will suppress the ionization of barium in the second set of solutions. Concentrations of reagents and major matrix components in both sets should be matched.
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