The conditions of detection were: carrier gas was helium, derivatives were separated with SE-54 fusedsilica capillary column, using temperature program and detected by using mutiple ion detection mode inwhich the ion of m/z 432 was the monitoring ion.
A Shear-Horizontal surface acoustic wave (SH-SAW) sensor fabricated on 36°-YX LiTaO 3 was developed for ion detection in liquid, both ion concentration and ratio in binary mixture can be detected in liquid flow system.
Methods:Samples were extracted by ethyl acetate and a satisfactory separation was achieved on Zorbax XDB C 18 column( 150 mm× 2.1 mm× 5 μm)by using the mobile phase consisting of CH 3OH(50%) and 0.1% HAC(50%). The ion mass spectral m/z:293\ + was slected to quantify by the selective ion monitoring(SIM) in a positive mode.
The eluent was detected by MS using atmospheric pressure chemical ionization (APCI) technique and selected ion monitoring (SIM) detection mode. Ions for quantitation were m/z 226 [M+H]+. The linear range was 0.05～2.0 mg/L, the detection limit was 0.0025 mg/kg and the average recovery was 94.0% with RSD less than 10%.
he feature of the flame ion current was introduced in this article, Also, the flame ion detecting techmique applying for gas utensil safeguarding and the design procedure of practical circuit were described and several practical circuits were provided.
Other possible applications of the single-ion detection technique were considered.
The system considerably improves the signal-to-noise ratio and helps the use of a detector with a small-area entrance window for ion detection.
The mobility of the daughter products was measured using the flow-through technique of air ion detection.
The use of multiple ion detection techniques for the quantitation of these compounds was also investigated.
Using crossed atomic, molecular cluster, and cw laser beams in conjunction with mass spectrometric ion detection, we have obtained for the first time results for electron transfer fromstate-selected Rydberg atoms to molecular clusters.
The detection limit in the selective-ion monitoring mode with preconcentration is 1 × 10-4 μg/mL.
The analytical ranges for chromatography-mass spectrometry were 0.05-1000 and 0.005-1000 μg/mL under the conditions of total ion current (TIC) scanning and selected ion monitoring (SIM), respectively.
To enhance selectivity, ESI-MS detection was optimized in the negative mode and selected ion monitoring (SIM mode).
A method was described for simultaneous determination of nine organic heterocyclic pesticide residues by gas chromatography-mass spectrometry-selected ion monitoring.
The lower detectable concentration of these compounds per ml of body fluids or g of wet tissue is either 1 μg or 20 ng, depending on the type of detector used, flame ionization or selected-ion monitoring.
The useful signal-to-background ratio in the detector's chamber is 3 × 104 during detection of ions with mass-to-charge ratio m/q = 4 amu.
The method is based on the principle of the internal-diffusion ion-exchange separation of a test mixture followed by the detection of ions using the macroscopic field phenomenon in multicomponent ion exchange.
Pulsed discharge in a hollow cathode with the detection of ions in a time-of-flight mass spectrometer: Analytical capabilities i
This paper discusses the use of capillary zone electrophoresis (CZE) with indirect UV detection for the separation and detection of ions.
There was an insufficient quantity of the compound with Rt of ZE-9,12-14 : Ac to get a full spectrum, but selective detection of ions at m/z 61 and 192 at the correct Rt supported the identification.
By measuring the time-of-flight from the photo-excitation to the ion-detection, a species of ions -mass and charge state- was identified.
Experiences are described with Geiger-counters for ion-detection in combination with a solid source mass spectrometer of the 600-sector field type and about practice of this apparatus for trace analysis of some alcali metals.
Starting from a 50 g sample and making use of the multiple-ion-detection technique (MID) the limit of determination is in the order of 0.1 μg/kg.
Normally, ion-detection has involved either simultaneous multi-element detection with an ion-sensitive photographic plate or sequential single-peak electrical detection.