WANG Jia-ding,TANG Gao,LU Yan,LU Heng-jun,YE Tao,SHI Rui-rui.Determination of 29 Trace Impurity Elements in Electronic-grade Phosphoric Acid Using Triple-quadrupole Inductively Coupled Plasma Mass Spectrometry[J].Journal of Instrumental Analysis,2025,44(05):844-852.
WANG Jia-ding,TANG Gao,LU Yan,LU Heng-jun,YE Tao,SHI Rui-rui.Determination of 29 Trace Impurity Elements in Electronic-grade Phosphoric Acid Using Triple-quadrupole Inductively Coupled Plasma Mass Spectrometry[J].Journal of Instrumental Analysis,2025,44(05):844-852. DOI: 10.12452/j.fxcsxb.240729260.
Determination of 29 Trace Impurity Elements in Electronic-grade Phosphoric Acid Using Triple-quadrupole Inductively Coupled Plasma Mass Spectrometry
A method for determining the content of 29 trace impurity elements in electronic-grade phosphoric acid using triple-quadrupole ind
uctively coupled plasma mass spectrometry(ICP-MS) in an ultra-clean environment was established. The use of a Class 100 cleanroom and a dynamic Class 10 sample introduction chamber effectively controlled contamination.By optimizing instrument parameters,the element response intensity was improved,and the oxide conversion rate was reduced to avoid mass spectrometric interference caused by oxide ions. The standard addition method was used to match the matrix effect,and a combination of multiple reaction modes including He mode,O
2
mode,and Cool-NH
3
mode was employed. This effectively avoided various polyatomic ion interferences generated from Ar plasma and phosphoric acid matrix side reactions,reduced the method detection limits,and improved quantitative accuracy. The results showed that the linear correlation coefficients for the 29 trace elements were all greater than 0.998 in the range of 0-100 ng/kg,the method detection limits in 1%(
w
/
w
) phosphoric acid solutions ranged from 0.03 to 3.39 ng/kg,the spiked recoveries were 77.6% to 112%,and the stability RSD was not more than 7.0%. These results are reliable and meet the requirements for determining electronic-grade phosphoric acid used in advanced processes.
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