Comparison of ICP-MS and Spectrophotometry in the Determination of Phosphoric Acid in the Air of Workplaces
Objective:To compare the advantages and disadvantages of inductively coupled plasma mass spectrometry(ICP-MS)and ammonium molybdate spectrophotometry in determining phosphoric acid in workplace air,and to improve the efficiency of analytical detection.Methods:Microporous filter membrane sampling was used,and ICP-MS and ammonium molybdate spectrophotometry were employed for determination.The pretreatment methods,linear range,detection limit,precision,accuracy,and actual sample determination were compared.Results:The pretreatment time for spectrophotometry was 1 h to 2 h,with a linear range of 250 μg/L to 20 000 μg/L,a detection limit of 400μg/L,precision of 2.6%to 6.4%,and an average recovery rate of 96.4%.For ICP-MS,the pretreatment time was 10 min to 20 min.In standard mode,the linear range was 50 μg/L to 250 μg/L,the detection limit was 1.99 μg/L,precision was 2.85%to 3.18%,and the average recovery rate was 98.1%.In KED mode,the linear range was 100 μg/L to 5 000 μg/L,the detection limit was 7.60μg/L,precision was 1.73%to 3.78%,and the average recovery rate was 97.3%.Conclusion:Compared with ammonium molybdate spectrophotometry,ICP-MS has a shorter pretreatment time,lower detection limit,similar precision and accuracy,and is suitable for the detection of low-concentration samples,effectively improving the efficiency of inspection.
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