46results about How to "Sample preparation method is simple" patented technology

The invention provides a determination method for dislocation density of large-size block iron and steel materials, which comprises the following steps of 1 preparing a standard test sample; 2 testing the standard test sample, determining magnetization rate x scale and coercive force Hc scale of the test sample, and further determining constant c scale of a standard test sample; 3 testing the standard test sample, determining the dislocation density rho scale of the standard test sample, and further determining the values of a coefficient b and a coefficient K; 4 preparing a test sample I to be tested; 5 testing magnetization rate x I and coercive force Hc I of the test sample; 6 jointly establish a formula x=c / Hc3 and a formula c=b+Krho, and obtaining the dislocation density rhoI; and repeating step 4-step 6 when testing a test sample II to be tested made of the same material and has the same preparation method with the test sample I to be tested. The determination method for the dislocation density of large-size block iron and steel materials has the advantages that a test result can reflect microscopic distribution of the dislocation density inside the test sample, and the method is simple, fast, easy to grasp and wide in use range.

The invention discloses a method for determining solid content of ABS by continuous bulk polymerization process. A sample is added into a certain amount of a mixed solvent with stirring, in order to dissolve more fully, a micro amount of hydroquinone or TBC (p-tert-Butylcatechol) is added; after the sample is completely dissolved with strong stirring, and the sample is added into a methanol solution drop by drop; the sample is allowed to stand after fully mixing for demixing, and a polymer phase is separated by filtering; the polymer and a filter are placed into a baking oven for drying, and the polymer and the filter are placed in a dryer for natural cooling at room temperature; mass of solids is weighed, and solid content of the sample is calculated. The method can effectively prevent the problem that monomers and a few initiators are remained after treatment of the sample, which can influence the test results.

The invention discloses a method for judging different origins of Pu-erh tea in a small area, comprising the following steps: (a) using a total reflection X-ray fluorescence spectrometer to analyze the content of inorganic elements in tea leaves; (b) using ultraviolet spectrophotometry to analyze the content of inorganic elements in tea leaves (c) using the linear discriminant analysis method to organize and analyze the quantitative results of each component obtained in steps (a) and (b) to realize the distinction of Pu-erh tea leaves from different origins; The method has the advantages of simple operation, low cost, environmental protection, and accurate and reliable detection results.

The invention relates to the technical field of chemical analysis, and in particular to a powder sampling method for X-fluorescence analysis. The powder sampling method comprises the following steps: (1) covering a working tray with an XRF Mayra film, placing a plastic ring on the XRF Mayra film, and enabling the working tray to hold the plastic ring completely; (2) adding a powder sample into the plastic ring, flattening, and compacting to enable powder to be parallel to the opening of the plastic ring so as to obtain a product to be manufactured; and (3) pressing the product to be manufactured on a sample pressing machine, molding, removing the working tray, and tightly sealing one side directly contacting air, of a sample piece, by using a transparent adhesive tape, thereby obtaining a finished product. The powder sampling method provided by the invention is simple, convenient and rapid to operate, the prepared sample piece is good in quality and use effect, surface flatness and smoothness can be stilled maintained under X-ray radiation and an environment approximate to vacuum environments, and cracking can be avoided in the actual analysis process, so that an analysis cavity can be prevented from being polluted, light splitting crystal can be prevented from corrosion in analysis, and the sample analysis accuracy and the X-fluorescence use security can be greatly improved.