Mario Amo-González

Sociedad Europea de Análisis Diferencial de Movilidad S.L. · R&D

The newly developed planar differential mobility analyzer (DMA) serving as particle sizer can achieve higher transmission and selection precision at ambient pressure compared with conventional cylindrical DMA, and show potentials on coupling with atmospheric pressure interface mass spectrometer (API-MS) for cluster detection with an additional ion...

A parallel plate differential mobility analyzer (DMA) having 100 independent current collectors is calibrated to relate the axial distances Ln between the inlet slit and the detector position to the particle mobility Z at given voltage difference V and sheath gas flow rate Q. Calibrating species are tetraheptylammonium bromide clusters (THABr) and...

Recently, the olive oil industry has been the subject of harsh criticism for false labeling and even adulterations of olive oils. This situation in which both the industry and the population are affected demands the urgent need to increase the controls to avoid fraudulent activities around this precious product. The aim of this work is to propose a...

A tandem ion mobility spectrometer (IMS^2) built from two differential mobility analysers (DMAs) is coupled at ambient pressure with a thermal fragmenter placed in between, such that the precursor ions selected in the first DMA are thermally decomposed at ambient pressure in the fragmenter and the product ions generated are filtered in the second D...

The rapid detection of ubiquitous gas-phase environmental compounds represents an exciting new application for mass spectrometers equipped with ion mobility interfaces. The integration of thermal desorption methods with differential mobility analyzer (DMA) interfaces and mass spectrometry has enabled the fast and sensitive detection of trace analyt...

Rationale The increased frequency in the number of international terror threats has led to a corresponding increase in demand for fast, sensitive and reliable screening methods suitable for the detection of airborne explosive vapors. We demonstrate herein a workflow suitable for the determination of nitrogen‐based explosives at the picogram level i...

The DMA combines an electric field and a flow field to select a narrow range of electrical mobilities. An optimized version of the P5-DMA connected to an electrometer allowed resolving powers in excess of 100 for an ion mobility of 0.97 cm2/V/s. DMAs, analogously to the quadrupole MS, separate ions in space rather than time, and may be similarly or...

Planar Differential Mobility Analyzers (DMAs) have previously achieved resolving powers of 60-80 (in air or N2, at the mobility of the Tetraheptylammonium ion (THA+; ~0.97 cm2/V/s). For unclear reasons, this performance is considerably below the theoretical limit. In this work, a performance close to this ideal limit is attained in SEADM's P5 DMA v...

Two differential mobility analyzers (DMAs) acting as narrow band mobility filters are coupled in series, with a thermal fragmentation cell placed in between, such that parent ions selected in DMA1 are fragmented in the cell at atmospheric pressure, and their product ions are analyzed on DMA2. Additional mass spectrometer analysis is performed for i...

The feasibility of detecting explosives in the atmosphere at concentrations as low as 0.01 ppq hinges on the poorly known question of what interfering species exist at these or higher concentrations. To clarify the issue, hundreds of samples of ambient air, either clean or loaded with explosives (from lightly contaminated environments) have been co...

The reliable measurement and understanding of particles emitted by road vehicle engines below the currently adopted 23 nm size cut-off is now under intense study in an effort to derive future European legislation on particle emissions, as recommended by the JRC Science and Policy Report (Giechaskiel and Martini, 2014). Here we present the modificat...

Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) were monitored in air, soil and vegetation (biota) samples within the vicinity of a solid waste incineration facility located in central Spain. Measurements were made monthly for a one year period. The analyses were carried out using a novel, low flow atmospheric pressure photoioni...

The differential mobility analyzer (DMA) is a narrow-band linear ion mobility filter operating at atmospheric pressure. It combines in series with a quadrupole mass spectrometer (Q-MS) for mobility/mass analysis, greatly reducing chemical noise in selected ion monitoring. However, the large flow rate of drift gas (~1000 L/min) required by DMAs comp...

Two fast electrometer circuits (10¹¹ and 10¹² V/A) are installed in a Faraday cage having a relatively small residence time. Removing readily distinguishable occasional spikes, the root mean square (r.m.s.) noise level at 10¹² V/A is 0.11 fA when acquiring data at 1 Hz. This value is close to the expected thermal resistor noise at room temperature...