Determination of inorganic elements in milk powder using wavelength dispersive X-ray fluorescence spectrometer.

摘要

The concentration of calcium, magnesium, phosphorus, potassium and trace elements, bromine, copper, iron, rubidium and zinc in different brands of milk powder and infant formulas have been determined using a wavelength dispersive X-ray fluorescence spectrometer. Lithium fluoride (LiF200) and pentaerythritol (PET) crystals were used with flow proportional detector (FPC) for the measurement of intensity of characteristic X-ray lines. Calibration curves were established using a set of synthetic standards in cornstarch matrix. The validation of the method was assessed by analysing an IAEA standard reference material of milk powder, IAEA-153. The results were in good agreement with the certified values