Quadruple analyser

Table II contains the mean values of the quadruplicate analyses of each of the five samples taken from the EC plot on days 13, 8, 83 and 139, together with standard deviations and the results of the analyses of variance. These may be compared with the data from the GF plot given in Table III.

Quadruple Mass Analyser Gloquad Manufecturer name... 

The quadruple MS detector, or mass filter as it is sometimes called, is extremely sensitive and allows the identification of compounds exiting the gas chromatograph. The compounds are ionized as they enter the MS (shown in Figure 13.5), where they are fragmented and analyzed. Other sensitive but also more selective detectors are available and may be called for in certain analyses. 

Unless otherwise indicated, metal content is given in micrograms per gram of protein. All zinc determinations by the dithizone method in duplicate, and in quadruplicate for the crystalline enzyme preparations. Copper determined by the sodium dithiocarbamate method. Spectrographic analyses were done in duplicate, and separately on two different instruments. 

Fig. 1. Schematic diagram of single-beam scattering spectrometer utilizing quadruple mass filters5 l.S.—ion source, G—grid, L,-L15—lens elements, R.C.— reaction chamber, C—channeltron multiplier, QMS—quadrupole mass filters, H—hemispherical energy analysers.

LC-MS-MS analyses were carried out in a system consisting of a LC quaternary pump Finnigan SpectraSYSTEM P4000 and Thermo Finnigan TSQ 7000 Triple-Quad triple-quadruple mass spectrometer all from Thermo Electron Corporation (San Jose, USA) and binary LC pump Perkin Elmer (Fremont, USA) for post column addition. 

An extensive study of the BH molecule has been presented by Ingamells et a/.107 The static a, / and tensors are computed by finite field and perturbation methods using Hartree-Fock, MP2, MP4 (including single, double, triple and quadruple substitutions), the Brueckner variant of the CCSD(T) method and DFT with the B3LYP functional. Contributions from vibration at MP2 level and rotation at Hartree-Fock level are calculated. The frequency dependence of the vibrational contribution is analysed. 

The stability of the materials was tested at +20 °C over a period of 12 months and selenite and selenate were determined at the beginning of the storage period and after 1, 3, 6, 9 and 12 months. Samples were analysed using the same procedures as for the homogeneity study. Selenite and selenate were each determined in quadruplicate (one replicate analysis in each of four bottles) at each occasion of analysis. The evaluation of the stability was based on the procedure described in Chapter 3, using the results of the homogeneity study (performed immediately after bottling) as reference for the samples analysed at the various occasions. 

At present there are no well-documented examples of Reactions 2 and 3 although several known compounds could serve as excellent models for these types of reactions. For example, the compounds M2Me2(02-CNR2)4, when heated to > 150°C in vacuo, eliminate ethane and yield residues which, by elemental analyses, can be formulated as M2(02CNR2)4 compounds. Both Mo2(CH2SiMe3)6 and Mo2(OPr )e have been found to react with acetic acid to yield, upon vacuum sublimation (200°C, 10 cmHg), Moo(OAc)4. Here a M-M triple-to-quadruple bond transformation is achieved. Reaction 3, but the detailed reaction pathway and the nature of the eliminated organic compounds are not known. 

Figure 7.10 The first concave 1,10-phenanthrolines with aryl bridgeheads were synthesized from a tetraphenollc precursor applying a quadruple Williamson ether synthesis (X = polymethylene or polyethylene glycol). The alternative product, a bis-metacyclophane (sometimes called earmuff, shown on the right), was not formed. The bimacrocyclic structure of the concave 1,10-phenanthroline was confirmed by X-ray analyses ...

A more suitable approach for on-line analysis is to view atomic emission directly from the small plasma formed above the sample surface when the sample is ablated using the laser. This approach, which is shown schematically in Fig. 20.12 has been applied to analyses of a variety of materials (e.g. [58-74]) and is known under a variety of names such as laser induced plasma spectrometry (LIPS), laser induced breakdown spectrometry (LIBS) and laser spark emission spectrometry (LASS). The laser used is typically a Nd YAG laser operating either at its fundamental, doubled or quadrupled frequency, although excimer and CO2 lasers have also been used. The important parameter of the laser is that it must be capable... 

The actual arrangement of these four sections in the commercially available version of the aerosol TOF mass spectrometer (TSI 3800) is illustrated in Figure 28.35. The pulsed ablation laser (frequency-quadrupled Nd YAG laser, at 266 nm) is seen at the bottom of the figure, together with the dual TOF mass analysers that record the... 

In (CgHslsMa where M = Mo or W two of the rings are -bonded to metal atoms whilst the third is sharply folded and bridges both metals in a -manner. The structures are identical with that of (CgHglsCra which has been reported previously. The analyses provide the second documented case of a W—W quadruple bond [W—W 2.375(1) A] the first being in WaMcg " where W—W is 2.264(1). ... 

Prime coupled a thermogravimetic analyser and an atmospheric pressure chemical ionization tandem triple quadruple mass spectrometer system to carry out evolved gas analysis on isoprene-styrene copolymers thereby obtaining information on comonomer ratios. 

Oil content is assessed as crude oil by exhaustive extraction with petroleum ether (ISO 659 1998). In our laboratory, NMR data are used to control the NIR, since we can analyse over 50 samples in quadruplicate by NMR in the time we need to analyse six samples in duplicate by the exhaustive extraction method. We use the extraction method to control the NMR and re-analyse any sample for which the NIR... 

At this stage, it is interesting to compare the Mpller-Plesset corrections (14.2.21) and (14.2.40) with the coupled-cluster wave function as analysed in Section 13.2.2 - see, in particular (13.2.12)-(13.2.15). The MPl correction contains only the connected first-order doubles - no disconnected terms appear at this level. To second order, the MP2 correction contains connected contributions from the second-order singles, doubles and triples amplitudes as well as a disconnected contribution from the first-order doubles - there are no eontributions from the connected quadruples to the MP2 wave function. 

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