Ms dart 712/29/2022 ![]() ![]() Tuning of JHTD current provided a method for controlling the relative degrees of thermal desorption and thermal decomposition. ![]() DOE also identified JHTD filament current and in-source collision induced dissociation (CID) energy as inducing the greatest effect on system response. A base set of conditions for JHTD-DART-MS was derived from this evaluation, demonstrating sensitive detection of a range of inorganic oxidizer salts, down to single nanogram levels. A partial factorial design of experiments (DOE) was implemented for the systematic evaluation of five system parameters. JHTD enhanced the utility and capabilities of traditional DART-MS for the trace detection of previously difficult to detect inorganic compounds. The resistive heating component generated discrete and rapid heating ramps and elevated temperatures, up to approximately 400 ☌ s −1 and 750 ☌, by passing a few amperes of DC current through a nichrome wire. An ambient mass spectrometry (MS) platform coupling resistive Joule heating thermal desorption (JHTD) and direct analysis in real time (DART) was implemented for the analysis of inorganic nitrite, nitrate, chlorate, and perchlorate salts. ![]()
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