Abstract:A triple tandems quadrupole inductively coupled plasma mass spectrometer equipped with a dynamic reaction cell (DRC) has been successfully applied to accurately determine phosphorus in copper/nickel/cobalt metal samples. This method utilizes the reaction between 31P+and O2 in the pool to quantify phosphorus by detecting the oxide ion 31P16O+of 31P+at m/z 47, eliminating the interference of multiple atomic ions and further optimizing the working conditions of the DRC system. The optimal signal-to-noise ratio of 31P16O+ is obtained under the condition of O2 flow rate of 0.9 mL/min. The standard addition method was used to overcome the matrix effect caused by the metal copper/nickel/cobalt matrix, and the experimental results were basically consistent with the results obtained by the national standard method spectrophotometry. The linear range of the method is 0.0001%~0.0050%, and the linear correlation coefficients are all above 0.9995. The detection limit of phosphorus in copper/nickel/cobalt metals is below 0.3ng/mL. The relative standard deviation of the actual sample measurement results is between 4.14% and 13.84%, and the recovery rate is between 94.9% and 118.5%.