Reagents for enhanced detection of low volatility analytes
Volatilization reagents are disclosed for improved detection of inorganic oxidizers such as chlorates and perchlorates by mass spectrometry. Thermal desorption methods are also disclosed in which the reagent transfers a proton to the anion (i.e., chlorate, perchlorate, etc.) of an inorganic salt analyte, forming an acid (i.e., chloric acid, perchloric acid) that is more easily vaporized and, hence, more easily detected. The reagents can include acidic salts or cation-donators, more generally. The class of reagents including polymeric acids, polymeric organic acids and polymeric sulfonic acids. Hydrated reagents or other reagents that can release water can also be employed as co-reagents. Further, these reagents can be embedded in a swipe or other substrate, delivered as a liquid infused via nebulizer, or otherwise introduced to a sample to be tested.
1. A method for detection of an analyte molecule, X, present in a sample, the method comprising:
treating the sample with an acidic evaporative reagent to form a higher vapor pressure analog of the analyte molecule, X, and
subjecting the treated sample to mass spectrometry, whereby the presence of analyte molecule, X, in the sample can be deduced,
wherein said acidic evaporative reagent comprises a polymeric sulfonic acid.
2. The method of claim 1 , wherein said polymeric sulfonic acid comprises any of a perfluorinated sulfonic acid and a polystyrene sulfonic acid.
3. The method of claim 2 , wherein said perfluorinated sulfonic acid comprises a sulfonated tetrafluoroethylene based fluoropolymer-copolymer.
4. The method of claim 1 , wherein the method further comprises associating the acidic evaporative reagent with a swipe prior to sample collection and then using the swipe to obtain the sample.
5. A method for detection of an analyte molecule, X, present in a sample, the method comprising:
treating the sample with an acidic evaporative reagent by incorporating the acidic evaporative reagent into a swipe to interact with the analyte molecule, X, present on the swipe wherein the reagent interacts with the analyte molecule, X, after it is released into a carrier gas along with the analyte molecule, X, captured by the swipe following thermal desorption.
6. A method for detection of an analyte molecule, X, present in a sample, the method comprising:
treating the sample with an acidic evaporative reagent to form a higher vapor pressure analog of the analyte molecule, X,
subjecting the treated sample to mass spectrometry, whereby the presence of the analyte molecule, X, in the sample can be deduced, and
applying a coreagent that releases water.
7. The method of claim 6 wherein the co-reagent is a thermally labile hydrate.