Objective To explore the method of potassium in milk sample determined by flame atomic absorption spectrometry (FAAS).Method The proteins and fats in milk samples were precipitated and isolated by TCA, and the filtrate were directly determined by FAAS at the second sensitive wore length of potassium ( 404.4 nm ).Results In the optimum condition, the linearity range of calibration curve of the potassium was 0.00-25.00 mg/L (r= 0.999? 9 ), and the relative standard deviation was 1.35%-1.96%, and the rate of r...