Abstract
Several experimental conditions were examined with regard to the determination of strontium in food by a UHF Plasma Spectra Analyzer. The most suitable experimental conditions were as follows: wavelength Sr II 4077.71Å, magnetron anode current 280mA, field current 380mA, plasma gas 3.5L/min, sheath gas 2.5L/min. The intensity of strontium spectrum was influenced with the diverse ions such as iron, calcium, magnesium, potassium and sodium, and the effects of potassium and sodium were remarkable. The calibration curve had preferable linearity and the mean value of the recovery rates in ten experiments for strontium determination was 101.6%.
The concentrations of strontium in 6 samples of fruit, tea and 3 samples of unpolished rice were determined by the experimental conditions above mentioned.
