Soxhlet extraction method

Occasionally there is the need for simultaneous determination of MW, MWD of polymers and identifica-tion/quantilication of additives [38]. This was the case for polymer and additive analysis of SBR/(softeners, flavour agents, stabilisers) (chewing gum) [41]. The many constituents of the SBR portion of the sample were not resolved, since adjacent components were similar in size. It should be stressed, however, that the need for simultaneous determination of the molecular weight of polymers and the identification/quantification of additives is exceptional rather than the rule. The determination of molecular weight distributions by SEC has indicated that oligomer fractions analysed by dissolution and (Soxhlet) extraction methods may differ essentially [42],... 

Producing data that cannot be compared directly with other total petroleum hydrocarbons data or guidelines because one data set is the result of a Soxhlet extraction method and the other reflects a sonication or other alternative extraction method. 

Gel fractions as a function of absorbed dose were measured for GMC using the conventional Soxhlet extraction method and these results compared with values found from the above method. Figure 5 is a plot of gel fraction (soxhlet method) versus absorbed dose for GMC. (rgej) equals 2.5 0.1 Mrad as compared to 2.1 Mrads found from the new technique. Above 2.5 Mrads an insoluble gel was rapidly formed with the gel fraction approaching a limiting asymptotic value of 1.0 at doses greater than 25 Mrad. The Charlesby-Pinner... 

Figure 5. Plot of gel fraction (soxhlet extraction method) vs. absorbed dose for GMC using 60Co radiation.

A comparison has been made between SFE and Soxhlet extraction methods in regards to recovery of analyte, speed of extraction, and relative cost per extraction (15). Such comparative studies are dependent, as is our study, not only upon the extraction conditions used but upon the type and cost of the equipment. The investigation described in this paper compares SFE with standard Soxhlet methods in terms of extraction time, analyte recovery, method simplification, environmental hazards, portability, and cost per extraction using a commercially available SFE system. 

Dr. Hwang (Frito-Lay, Inc.). Snack food samples, Soxhlet extraction method, Soxhlet extractions, and analysis of Soxhlet extracts. 

Meyer et al. [173] showed that supercritical fluid extraction results can give recoveries comparable to Soxhlet extraction methods, even for soils with high carbon contents. McNally et al. [174] have studied factors affecting the supercritical fluid extraction of soils. It was shown that soil type affects the recovery of moderately polar analytes. In general the organic carbon content of the soil governs analytical recovery. 

The Soxhlet extraction method discussed in Section 6.6 can be used to separate the sol and gel fractions of a gel in the gelation regime, allowing direct determination of the gel fraction gel- Percolation theory expects the molar mass of a network strand M to be the same as the characteristic molar mass in the sol fraction. Hence, M can be determined by the size exclusion chromatography methods of Section 6.6, applied to the sol fraction. Equation (7.93) is tested in Fig. 7.19, where the shear modulus is shown to be proportional to Pgei/M. ... 

Vazquez Blanco, E., Lopez Mahia, P., Lorenzo, S. M., Rodriguez, D. P., and Fernandez Fernandez, E., Optimization of MAE of hydrocarbons in marine sediments comparison with the Soxhlet extraction method, Fresenius J. Anal. Chem., 366, 283-288, 2000. 

A comparison of sonication and Soxhlet extraction methods was made by Lopez-Avila et al. ° EPA methods 3550 and 3540 were used to extract some phthalate esters from solid samples, such as sandy loam soil and municipal sludge. The mean recoveries for the method 3540 (Soxhlet extraction) were, in general, similar to those obtained for method 3550 (ultrasonic extraction) however, its RSD was much higher. 

Solvent solubility is widely used to classify coal-derived products (1.,2). The most popular methods are based on some form of Soxhlet extraction. Methods involving Soxhlet extraction are normally time consuming thus complete solvent solubility classification is laborious. An alternate method, used initially by Bertolacini et al. (3.) and modified for our use, employs pressure filtration. Pressure filtrations carried out at room temperature have been used to classify a number of coal-derived products obtained under a variety of liquefaction conditions. 

The THF solubility values (Table III, SCT 65 69) demonstrate that the extractions using the pressure-filtration method are thorough, and the solubility values are comparable to the continuous Soxhlet-extraction method When the same procedure was performed using cyclohexane, a large difference was seen between low-temperature Soxhlet-extraction values and the pressure-filtration values ... 

More information about the Soxhlet extraction method is given in CEN EN 12697-1 (2012), Annex B.1.3. 

Tables 1 and 2 show the amount of anionic surfiictant removed from the cotton and polyester rics using soxhlet extraction methods subsequent to a normal wash and rinse process. It is assumed that had the detected anionic suifrictant not been forcibly extracted from ifae fibrics at least this amount would still be retained within the materid following domestic washing. Inunediately it is clear that even at the lowest concentration (0.2 g(L) die cotton fabric has released (and therefore is assumed to...

Table 5.2 The average percentage recovery and relative standard deviations (RSDs) of some pollutants, using classical and modem automatic Soxhlet extraction methods [29]...

For QC purposes the duration of the test is an important criterion. In this respect, Soxhlet extraction performs better than the conical flask method. A systematic - unexplained - difference was noticed between Soxhlet MEK extraction and the conical flask method using a 2 1 mix of acetone and cyclohexane. The Soxhlet extraction method using MEK as the solvent has been recommended for the determination of the oil content of oil-extended EPDM [57]. 

Ultrasound has also been used to enhance extraction of oil from oilseed rape (Wei et al., 2008). As with other studies, extraction efficiency was significantly affected by extraction time and extraction power, and then the liquidisolid ratio. A liquidisolid ratio of 1 4 (L g), an ultrasound-assisted extraction time of 60 min, and power of 500 W were found to be optimal for extracting up to 20 mg of ground oilseed rape, when compared to a standard Soxhlet extraction method. 

Mr. Aoki tried to conserve excavated archaeological art objects. For instance, an iron sword is at first desalted by the Soxhlet extraction method. After that it is treated with an organofunctional silane followed by impregnation with acrylic resin emulsions the analysis of polymeric material used for these preservations is very important, as in general, polymeric materials are important for the preservation of the art objects. 

MIP methyl ethyl ketone insoluble part by Soxhlet extraction method Polymn.conds. toluene 100ml, St 50ml, 50"C, 2hrs... 

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