Introduction to Human Nutrition: Body Composition : In vivo neutron activation analysis - Direct methods in Body composition techniques. Related Topics Body composition techniques. Direct methods - Body composition techniques. Indirect methods - Body composition techniques. Doubly indirect methods - Body composition techniques. Carcass analysis - Direct methods in Body composition techniques.
In vivo neutron activation analysis - Direct methods in Body composition techniques. Densitometry - Indirect methods in Body composition techniques. Dilution techniques - Indirect methods in Body composition techniques. Total body potassium - Indirect methods in Body composition techniques.
As explained above on the different production technique of activation, classified as Chemically activated carbon and Steam activated carbon. Almost any organic matter with a large percentage of carbon could theoretically be activated to enhance its sorptive characteristics.
In practice, however, the best candidates for activated carbon contain a minimum amount of organic material, have a long storage life,are hard enough to maintain their properties under usage conditions, may be obtained at a low cost, and obviously are capable of producing a high-quality activated product when processed. Activated carbon are complex materials and depending upon its requirement on the end application it is grinded or moulded to different forms.
Absorption:: A process in which molecules are taken up by a liquid or solid and distributed throughout the body of the liquid or solid. Activated carbons do not absorb other materials impurities. Activated Carbon: A family of carbonaceous materials manufactured by processes that develop an internal pore structure with adsorptive properties. Adsorption: A process in which molecules or atoms are concentrated on a surface by chemical or electrostatic physical forces, or both.
Bulk Density is used to determine the weight of a fixed volume of activated carbon. Chemisorption chemical adsorption : The binding of an adsorbate to the surface of a solid by forces whose energy levels approximate those of a chemical bond. Dosage: The quantity of substance applied per unit weight or volume of the fluid liquid or gas being treated with carbon.
Impregnated Carbons: Activated carbons that are post-treated with various chemical compounds designed to enhance the adsorptive or catalytic properties of the carbon in either liquid or gas phase applications. Mesopore: In activated carbon, a pore having a diameter between angstroms. Macropore: In activated carbon, a pore having a diameter greater than angstroms.
Micropore: In activated carbon, a pore having a diameter less than 20 angstroms. Molasses DE Decolorizing Efficiency : A measure of a carbon's ability to remove color from a standard molasses solution. Hence, RE for a carbon means it adsorbs color from molasses like the standard carbon. Phenol Number: The concentration of phenol in excess of 0. Reactivation: The act of restoring adsorptive character to a contaminated activated carbon by a process similar to the original activation process.
Surface Area B. Brunauer, Emmett, Teller equation, from nitrogen adsorption or desorption data obtained under specified conditions; square meters per gram.
NAA relies on excitation by neutrons so that the treated sample emits gamma-rays. It allows the precise identification and quantification of the elements, above all of the trace elements in the sample.
NAA has applications in chemistry but also in other research fields, such as geology, archeology, medicine, environmental monitoring and even in the forensic science. The method is based on neutron activation and therefore requires a source of neutrons. The sample is bombarded with neutrons, causing the elements to form radioactive isotopes. The radioactive emissions and radioactive decay paths for each element are well known. Using this information, it is possible to study spectra of the emissions of the radioactive sample, and determine the concentrations of the elements within it.
A particular advantage of this technique is that it does not destroy the sample, and thus has been used for analysis of works of art and historical artifacts.
NAA was used to learn how to go from ash to eco-friendly solution for hazardous metals removal. Click to know more! Neutron Activation Analysis is very sensitive and is therefore used to analyse for minor elements, which are present in very low concentrations.
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