Detector MS

NPD, niti ogen-phosphorus detector FID, flame-ionization detector MS, mass specti ometer. n.q., not quantified n.s., not specified. 

HPLC has been recommended as a cleanup and fiactionation procedure for food samples prior to analysis by GC/ECD (Gillespie and Walters 1986). The advantages over the AOAC-recommended Florisil colunrn are that it is faster, requires less solvent, and gives better resolution. HPLC coupled with various detectors MS, MS/MS, UV/electrochemical detector, or UV/polarographic detection has been tested as a rapid, simplified separation and detection system to replace GC (Betowski and Jones 1988 Clark et al. 1985 Koen and Huber 1970). Recoveries, detection limits, and precisions were generally good, but further work is needed before the techniques are adopted for general use. 

ECD = electron capture detector GC = gas chromatography HPLC = high-performance liquid chromatography MC = microcoulometric detector MS = mass spectrometry NICI = negative ion chemical ionization RSD = relative standard deviation SPE = solid phase extraction... 

GC nitrogen-phosphorus detector (NPD), flame photometric detector (FPD), electron capture detector (BCD), flame ionization detector (FID), mass-spectrometric detector (MS)... 

As a rule, a confirmatory GC measurement is performed with a capillary column of different polarity and/or a different detector. The mass-selective detector (MS) (Module D4) is especially suitable for the confirmation of results. 

X. Zhang and R.A. Laursen, Development of mild extraction methods for the analysis of natural dyes in textiles of historical interest using LC diode array detector MS, Anal. Chem., 77, 2022 2025 (2005). 

GC = gas chromatography GPC = gel permeation chromatography ECD = electron capture detector MS = mass spectrometry MSD = mass selective detector SFE = supercritical fluid extraction TLC = thin layer chromatography... 

ECD = electron capture detector FID = flame ionization detector- GC = gas chromatography HRGC = high-resolution gas chromatography HSD = haldie specific detector MS = mass spectrometry MWP = microwave piasma... 

Detector MS 6890 series mas selective dector, HP, Palo Alto, CA... 

FID = flame ionization detector GC = gas chromatography HSD halogen-selective detector MS = mass spectometry NR = not reported... 

GC, gas chromatography FID, flame ionization detector MS, mass spectrometry EQL, estimated quantitation limit (the EQL of Method 8270 for determining an individual compound is approximately 660 qg/kg (wet weight) for soil/sediment samples, 1-200 mg/kg for wastes (dependent on matrix and method of preparation), and 10 J,g/L for groundwater samples) NR, not reported... 

Rocuronium bromide, other quaternary ammonium drugs and herbicides Column Atlantis dC18 (100 mm x 2.1 mm) Mobile phase (A) 15 mM HFBA-20 mM ammonium formate buffer adjusted to pH 3.30 by formic acid (B) MeOH 100%. Linear gradient run from 5% to 90% of solvent B within 18 min. Detector MS/MS using ESI in the positive mode m/ z 529 487.2... 

Baena, J.R., M. Gallego, M. Valcarcel, et al. 2001. Comparison of three coupled gas chromatographic detectors (MS, MIP-AES, ICP-TOFMS) for organolead speciation analysis. Anal. Chem. 73 3927-3934. 

The critical properties of detectors are sensitivity, selectivity and linearity of response, reproducibility, and reliability of operation. Spectrometric detectors, MS and Fourier transform infrared (FUR), are described in more detail in other sections. The following detectors are useful for the detection of CWC-related chemicals. 

Abbreviations FID flame ionization detector BCD electron capture detector FPD flame photometric detector MS mass spectrometer MED microwave emission detector AAS atomic absorption spectrometer. 

The analysis of polynuclear aromatic hydrocarbons pollutants was performed on a Fisons Instrument Gas Chromatograph GC-800 series, connected to a Fisons Instrument Mass Selective Detector (MS) MD-800. 

SPE = solid-phase extraction LLE = liquid-liquid extraction DAD = diode-array detector EC detector ECD = electrochemical detector FED = fluorescence detector MS = mass spectrometry. 

Some new specialised detectors are mass spectrometry detectors (MS), evaporating light scattering detectors (ELSC) and atom specific detectors. They all have in common that the mobile phase stream has to be split to secure a safe operation of the fragile detection system. As pointed out earlier, the eluent stream can be split by active and passive principles. For certain applications, mainly in the isolation of impurities with unknown structures in the mg range, the combination of these detectors to preparative equipment is of high value. As soon as the diameter of the... 

At this point, the sample is analyzed by gas chromatography (GC), the analytical method of choice for volatile halogenated hydrocarbons. Information on the analysis of these samples by GC is presented in Section 6.2, with a discussion of the advantages and disadvantages of each method. The technique of Antoine et al. (1986) showed a 5% variance on a series of 2 ppb spiked samples, and the analysis had a linear response ranging from 0.5 to 50 ppb. Although infra-red spectrometry has less sensitivity than electron capture detectors (ECD), Hall electroconductivity detectors (HECD), and mass spectrometrlc detectors (MS), it has been used to quantify the levels of... 

Bilia et al. describe the importance of flavonoids in interaction between artemisinin and hemin [107]. Hemin is thought to play a role in the activation of artemisinin. It is thus of value to develop a method that can analyze artemisinin and flavonoids simultaneously. Bilia et al. developed a method based on HPLC/diode-array-detector/MS delivering just that [108]. 

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