Double membrane desolvator for direct analysis of isopropyl alcohol in inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry( ICP-MS)

摘要

A double membrane desolvator (DMD) with an MCN was built and tested for the analysis of isopropyl alcohol using ICP-AES and ICP-MS. Unlike a conventional membrane desolvator, two different concentric membrane tubes were used for the DMD. Additionally, the length of the membrane was reduced in half and the total area was increased. Influence of sweep gas flow on analyte intensities in ICP-AES was studied. Approximately 70-90% of C(I) signal was reduced by using the DMD and this reduction was the largest among the emission lines measured, for example Cr(II), Ca(II), and Mn(II) showed the reduction in the range of 30-50%. The use of DMD also reduced the background level, and heating the spray chamber enhanced the signal intensity of Cr(II) significantly in ICP-AES. For ICP-MS, the reduction of molecular interference was demonstrated when MCN-DMD was used. The ratio of CeO+/Ce+ was approximately 0.16 at the sample uptake rate of 210 mu l/min and it was reduced by a factor of 3 for 110 mu l/min. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 14]