Nylon Filter Extraction Study

摘要

Questions have recently been raised about the efficiency of extracting a Nylon filter for the analysis of ions. Specifically, is deionized water a suitable solvent for extracting the nitrate ion from the ambient air Nylon filter. Currently most of the PM(sub 2.5) speciation samples are extracted with deionized water although some laboratories use an aqueous buffer as the extraction solvent. This study has examined the two most frequently used extraction methods which are routinely applied to Nylon filters collected by the Speciation Trends Network (STN) and the Interagency Monitoring of Protected Visual Environments (IMPROVE) network.