The basic principles of activated charcoal filtration chromatography and its use in recovering L-tyrosinefrom L-cystine waste were presented in ths paper. 相似文献
Passive methods for radon measurements, especially those based on radon adsorption, require observation of proper calibration methods.
The calibration method for diffusion-barrier charcoal detectors in a small (211 dm3) radon chamber has been proposed. The theoretical dependence of radon concentration vs. time inside the chamber during the exposure of charcoal detectors has been obtained and verified experimentally. For this purpose, the chamber volume as well as diffusion and adsorption parameters of the detector were taken into consideration.
For two types of detectors the conformity of calibration factors obtained in two ways: calculated from theoretical points (550 or 683 Bqm−3/cps depending on detector type) and from experimental points (553 or 691 Bqm−3/cps), was achieved.
The proposed method makes it possible to calibrate different kinds of radon-adsorbing detectors (not only charcoal canisters) in small chambers without the necessity of using any reference, active device. 相似文献
In order to develop a suitable reactor for the biomethanation of high-strength salty cheese whey, the performance of anaerobic
upflow fixed-film reactors packed with different support materials, such as charcoal, gravel, brick pieces, pumicestones,
and PVC pieces, has been studied. The charcoal-bedded reactor gave the best performance, with the maximum gas production (3.3
L/L digester/d) and an enriched methane content (69% CH4). Temperature and hydraulic retention time were optimized, with the ultimate aim of improving biomethanation. Maximum gas
production (3.3 L/L digester/d) was achieved at a hydraulic retention time of 2 d at 40°C. 相似文献
Specific method for accurate radioimmunoassay of free and total thyroxine in un-extracted serum has been developed. The method is used for estimation of either free thyroxine (T4) or total T4 by inhibition of the binding sites of T4 to protein using TCA/NaOH mixture. The antibodies used in this study were obtained from Mallinkrodt. The separation technique used in our modification is that of dextran charcoal, this is to absorb the free fractions on charcoal. The kinetics of antibody antigen combination, the parameters of the experiment like; charcoal concentration, antibody dilution, temp., time of incubation and radioactivity concentration were, studied to optimize the standard curve and the sensitivity of T4RIA. Serum samples of different thyroid cases were investigated for determination of free and total T4 concentration to get the levels for each group of which 50 normals, 57 hyperthyroidism and 21 hypothyroidism in comparison with the classical tests of thyroid functions. Also sensitivity and variance coefficient has been carried out in comparison with other T4RIA techniques. 相似文献
Abstract A nondestructive analysis for chemical reactivity of commercial whetlerite (activated charcoal impregnated with copper, chromium and silver) is described. It is based on monitoring the disappearance of carbon monoxide in mixtures with air from known flows passing through the charcoal in a flow-through mode. Correlation of CO oxidation was found with measurements of cyanogen chloride retention using the same samples. the disappearance of carbon monoxide was also followed using a recycle procedure. However, the results using this particular method for CO oxidation may not lead to a good correlation with cyanogen chloride retention. 相似文献