Sorption sample concentration

All elution curves were reproducible at 0.2% (or better), practically independently on the sample concentration from 0.5 to 5 mg/ml. A concentration-dependent knick occurred in these curves after replacing a 1 cm3 of the covered glass beads by uncovered ones. It is well known that sorption effects are concentration-dependent... 

Concentration-dependent recovery is an analytical chemist s nightmare. If an SPE method is to be useful, the analyst must demonstrate that sorption is not dependent on sample concentration in the expected concentration range of samples to be analyzed. 

These results have important implications for surface complexation and reactive transport models as co-precipitation of nanoscale multicomponent phases may be a significant mode of sorption, particularly under conditions where the concentration of metal ions in the aqueous solution is fairly high. Such phases also provide new surfaces on which further sorption of aqueous ions can occur. However, detection of these phases and distinguishing them from the sorbate metal hydroxide phase requires very careful EXAFS analysis and HRTEM studies of sorption samples. 

Equation 9.4 also suggests that decreasing the sample concentration in the vapor reduces the sorbed chemical on the surface. Therefore, the effective way to clean the SAW device after an analysis is the use of heat to reduce the sorption coefficient while using a clean carrier gas to flush the released sorbates out of the detector. 

Cephalosporin antibiotics ai e the largest and varied class of diaigs. These medicaments ai e widely applied in treating different diseases in the present time. Sorption in modified sorbents is used for concentrating these compounds. The method makes it possible to improve degree of extraction, purify sample from interferents and prolong time of chromatographic column life. 

Subba-Rao RV, M Alexander (1982) Effect of sorption on mineralization of low concentrations of aromatic compounds in lake water samples. Appl Environ Microbiol 44 659-668. 

A typical sorption experiment involves exposing a polymer sample, initially at an equilibrium penetrant concentration of c to a bathing penetrant concentration of Ci. The weight gain or loss is then measured as a function of time. The term sorption used in this context includes both absorption and desorption. The sorption is of the integral type if c° = 0 in the case of absorption or if cf = 0 in the case of desorption. Details of the experimental setup for the sorption measurement are discussed elsewhere [4],... 

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