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Compensation of Mass Spectrometric Interferences with the miniRUEDI Portable Mass Spectrometer

The miniRUEDI is a portable mass spectrometer system, which is widely used in environmental research 1,2 to study biogeochemical turnover and the origin, mixing and exchange of fluids. The miniRUEDI instruments are designed for on-site gas analysis during field work at remote locations and allow quantification of individual gas species in gaseous or aqueous matrices. The partial pressures of the gas species in a sample (e.g., He, Ar, Kr, N 2 , O 2 , CO 2 , CH 4 , etc.) are calibrated by comparison of the ion-current peak-heights measured with the mass spectrometer relative to a reference gas with well known partial pressures. However, depending on the target species and the composition of the analyzed gases, some ion-current peaks may result from overlapping signals from different species contributing to the ion-current at the same m/z ratio (e.g. CH 4 /O 2 /N 2 or Ne/Ar/H 2 O). Such interferences need to be disentangled and compensated to allow accurate calibration of the gas partial pressures by ion-current peak-height comparison. To this end, we developed a tool for accurate compensation of mass spectrometric interferences. This tool deconvolves the measured ion-current spectra in terms of well-known spectra of the involved gas species. The deconvolution yields the fractions of the ion-current contributions of the various gas species to a given ion-current peak and thereby accomplishes a substantial improvement of the analytical accuracy in situations where mass-spectrometric interferences cannot be avoided.