Quadrupole Mass Filter
Quadrupole Mass Filter - Related Videos
08:10
Fizzy Extraction of Volatile Organic Compounds Combined with Atmospheric Pressure Chemical Ionization Quadrupole Mass Spectrometry
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Cited by 16 •
2017
Fizzy extraction is a new laboratory technique for analysis of volatile and semivolatile compounds. A carrier gas is dissolved in the liquid sample by applying overpressure and stirring the sample. The sample chamber is then decompressed. The analyte species are liberated to the gas phase due to effervescence.
13:45
Introduction to Mass Spectrometry
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2023
Source: Laboratory of Dr. Khuloud Al-Jamal - King's College London Mass spectrometry is an analytical chemistry technique that enables the identification of unknown compounds within a sample, the quantification of known materials, the determination of the structure, and chemical properties of different molecules. A mass spectrometer is composed of an ionization source, an analyzer, and a detector. The process involves the ionization of chemical compounds to generate ions. When using...
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Tandem Mass Spectrometry
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2023
In tandem mass spectrometry a biomolecule of interest is isolated from a biological sample, and then fragmented into multiple subunits in order to help elucidate its composition and sequence. This is accomplished by having mass spectrometers in series. The first spectrometer ionizes a sample and filter ions of a specific mass to charge ratio. Filtered ions are then fragmented and passed to a second mass spectrometer where the fragments are analyzed. This video introduces the principles of...
01:27
Passive Filters
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2024
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources. Low-Pass Filters Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
04:19
An Improved Technique for Trimethylamine Detection in Animal-Derived Medicine by Headspace Gas Chromatography-Tandem Quadrupole Mass Spectrometry
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Cited by 2 •
2023
Here, a headspace gas chromatography-tandem quadrupole mass spectrometry (HS-GC-MS/MS) method suitable for the determination of trimethylamine (TMA) in animal-derived medicines is described. The protocol includes sample pretreatment, headspace treatment, analysis conditions, methodological validation, and the determination of TMA in animal-derived medicines.
FAQs
An ion passes through the rod set only when its motion remains stable under the combined RF and DC electric fields. Ions outside the selected stability conditions develop unstable trajectories and are removed rather than continuing through the analyzer. This stability-based filtering converts differences in mass-to-charge ratio into a controllable separation and isolates a targeted ion population.
The RF and DC voltages jointly establish the electric-field conditions that govern ion stability. Changing their values, or changing the applied frequency, alters which mass-to-charge ratios can maintain stable trajectories through the rods. By adjusting these operating conditions, a chemist can favor transmission of a selected ion or shift the analyzer toward different portions of an m/z range.
A fixed voltage and frequency combination can be adjusted to transmit a particular mass-to-charge ratio, whereas scanning changes the operating conditions across a range. The resulting sequence of transmitted ions produces a mass spectrum rather than a single selected response. This distinction lets the same analyzer support targeted measurements and broader examination of ion composition.
After ions are introduced into the analyzer, the quadrupole receives specified RF and DC voltages at a chosen frequency. The instrument then maintains conditions that allow the desired trajectories to remain stable while other ions are removed. Operators can hold the settings for a selected m/z value or vary them systematically to scan across a range.
Scanning across mass-to-charge ratios generates a mass spectrum that records the ions transmitted under changing filter conditions. Chemists can use this pattern to support compound identification and structural analysis, while selected or measured ion responses can contribute to quantitative measurements. The information therefore links ion separation with both qualitative and quantitative interpretation.
Quadrupole mass filters are used in analytical chemistry to examine compounds through their mass-to-charge behavior, supporting identification, structural analysis, and quantification. They also have applications in environmental chemistry, where measurements may require distinguishing and assessing chemical components. Their ability to select individual m/z values or scan ranges makes them useful for both targeted and broader analyses.