Objective To find better conditions and methods to improve the accuracy and reliability of the measurement by evaluating and analyzing the total molybdenum uncertainty in soil.Methods The content of total molybdenum in soil was determined by inductively coupled plasma mass spectrometer with three acid digestion.Results The detection limit of the method was 0.011 mg/kg,the correlation coefficient R of the calibration curve was 0.9999,the recovery was 97.8%-105.6%,and the precision of the method was 2.49%.The extended uncertainty of the method for the determination of total molybdenum content in soil was(0.660±0.03)mg/kg(K=2).Conclusion By analyzing the main sources affecting the uncertainty of measurement,the factors affecting the uncertainty of the whole process of determination,such as repeatability,curve fitting,standard solution,sample constant volume,sample weighing,glass measuring tools and sample digestion process were analyzed.Firstly,various conditions during the digestion process,such as digestion temperature and digestion time,should be strictly controlled to reduce the sample loss.Secondly,microwave digestion,high pressure digestion and other technologies can be used to optimize the pre-treatment mode to improve the accuracy and reliability of the measurement results.
inductively coupled plasma mass spectrometersoilall molybdenumuncertainty
NETL
NSTL
万方数据
