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  •  Purity Testing of Silica Membrane
  •  Purity Testing of Silica Membrane

Purity Testing of Silica Membrane

Details
Membrane Extractant m/z Ion Compound Source
Biocomma Silica
Membrane
Pure Water 304 M+Na+ oleamide Slip agent in polyethylene films
97 HSO4-    
H2PO4-    
Methanol 360 M+Na+ erucamide Slip agent in polyethylene films
Filters from
Well-known brand
Pure Water 304 M+Na+ oleamide Slip agent in polyethylene films
97 HSO4-    
H2PO4-    
Methanol 360 M+Na+ erucamide Slip agent in polyethylene films
425 M+Na+ Unidentified contaminant  
701 M+Na+   from water and solvent filters

Remarks:
1. The table only records ions that match the “ESI Common Background Ions” reference table.
2. The results have deducted the ions present in the blank, but if a particular m/z ion significantly exceeds the blank, it is recorded.
Conclusion:
Proceed ultrasonic extraction in both water and methanol, mass spectrometry results showed the presence of precipitates in both Biocomma 
membrane and well-known brand filter. Compound identification was carried out through high-resolution mass spectrometry by full scanning and 
matching with the “ESI Common Background Ions” reference table. The primary precipitates were HSO4-, H2PO4-, and Na+, and these presence 
is attributed to the material being glass fiber in the membranes. No other substances were found to precipitate from either of the two membranes, 
confirming their purity.
 

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