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A method for determining the chromium content of iron-chromium mixtures
The application discloses a method for determining the content of chromium in a mixture of iron and chromium, and comprises the following steps: S1, oxidizing the divalent iron ions in the mixture of iron and chromium into trivalent iron ions under an acidic condition; S2, adding sodium hydroxide solution and hydrogen peroxide under stirring, so that the trivalent iron ions form iron hydroxide precipitate, and the trivalent chromium ions are oxidized into hexavalent chromium ions; S3, adding an acidic solution, so that the iron hydroxide precipitate is dissolved, and the wrapped trivalent chromium ions are released; adding sodium hydroxide solution and hydrogen peroxide under stirring, so that the trivalent iron ions form iron hydroxide precipitate, and the released trivalent chromium ions are oxidized into hexavalent chromium ions; S4, repeating the step S3 X times; X is an integer greater than 0; and S5, determining the content of chromium in the mixture. The method for determining the content of chromium in the mixture of iron and chromium has the advantages of accurate measurement, high precision, simple operation and improved efficiency of the determination of the content of chromium.
Owner:TANGSHAN 3R CHEM CO LTD +1
Sensor four-corner error measuring device convenient for weight positioning and replacement
ActiveCN224066207UDoes not affect testingTrim four corner parametersWeighing apparatus testing/calibrationClassical mechanicsLoad cell
Owner:JINGWEITE MEASUREMENT & CONTROL TECHNOLOGY (HUAIAN) CO LTD
sample analyser
The application is suitable for the field of medical equipment, and discloses a sample analyzer. The sample analyzer comprises a machine body, a first loading component, a first buffer component, a first transfer component, an output component, a detection component and a controller. The first buffer component is used for buffering first consumables to be used and coming from the first loading component; the controller is configured to: in the process that the first loading component performs a task of loading the first consumables, control the detection component to perform at least part of a process in a sample detection item on a sample by using the first consumables buffered by the first buffer component, control the output component to output first operation prompt information according to a first residual time in which the first consumables buffered by the first buffer component can support the detection component to perform the sample detection item, so as to remind to complete the operation of loading the first consumables in the first loading component within the first residual time. The sample analyzer can meet the design requirements of loading consumables without stopping and small biological safety risk under a small volume.
Owner:SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
Sheet sample auxiliary tool for testing
ActiveCN224274761UDoes not affect testingplay a protective roleWork holdersStructural engineeringTweezers
The utility model discloses a sheet sample auxiliary tool for testing, which is formed by assembling a cubic block with a groove and a flat head screw, the upper and lower end faces of the cubic block are flat, the center of the cubic block is provided with a vertically through groove, one side of the groove is exposed, the other side of the groove is closed, a sample can be vertically placed in the groove, and the whole square design is convenient for tweezers to clamp. A round hole is formed in the front of the cubic block and located in the height center, left or right (located in the right center of one face of the groove), the back of the cubic block is closed and free of holes, a flat screw can be placed in the hole, and the sheet sample in the groove can be fixed by tightening the screw and can be disassembled by unscrewing the screw. The tool product is convenient, small, exquisite and efficient, can assist a sample to quickly stand on an objective table, can be disassembled without influence after a probe ejector rod is fixed, can be placed around the sample to play a role in protecting the enclosure, prevents the sample from falling out of the objective table, and can greatly improve the lofting efficiency and the test success rate.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY