When nitrogen-containing organic matter is heated together with concentrated sulfuric acid, carbon, hydrogen, and nitrogen are converted into carbon dioxide, water, and ammonia, respectively, and ammonia reacts with sulfuric acid to produce ammonium sulfate. In order to speed up the Kjeldahl reaction, potassium sulfate or sodium sulfate is usually added to increase the boiling point of the reaction solution, and copper sulfate is added as a catalyst. Accurately measure 0.40 mL of concentrated hydrochloric acid in a 500 mL volumetric flask, dilute to volume with secondary distilled water, and transfer to a reagent bottle until calibration.
The concentrated alkali in the Kjeldahl analyzer reacts with ammonium sulfate in the digestion solution to release ammonia. The water vapor is used to distill the produced ammonia into a certain amount of boric acid solution with a certain concentration. The boric acid absorbs ammonia to make hydrogen in the solution. The ion concentration is reduced and then titrated with standard concentrations of hydrochloric acid until the original hydrogen ion concentration in the solution is restored. Finally, the amount of total nitrogen in the analyte is calculated based on the amount of hydrochloric acid used.
It is not only the determination of the protein content used in the above products, but also the correlation of the nitrogen content in the general substance can be determined by Kjeldahl determination, which of course has certain requirements for the composition of nitrogen. Kjeldahl determination of the use of wine residue can further improve its utilization, but also shows that the principle of waste in processing to do a qualitative and simple analysis.
Honed tube is well known as hydraulic cylinder tube in industries. As honed tubes are the most important material of manufacturing hydraulic cylinders
We manufacture the honed pipes using our factory`s [Suitable To Hone" Steel Cold Drawn Seamless Tubes (CDS tubes)& Steel Cold Drawn Welded Tubes (CDW tubes). In order to produce extremely precise ID dimensions and smoothly ID surface, the honing process involves using abrasive polishing stones and abrasive paper to remove small amounts of material. Besides the honing process, we also use the SRB process (skiving and roller burnishing) to produce honed tubing. Honed tube is ready to use for hydraulic cylinder applications without further ID processing.
Honed precision tubes are made of seamless steel tubes, with raw materials hot rolled, under cold drawn process then honing. They are widely used for manufacturing hydraulic cylinders. Honing is a finishing method whose goal is to ensure perfect surface grade, in our case final treatment of the inner diameter of the tube. Advantage of this classic procedure honing is high geometrical accuracy of the shape with minimal conicity and waviness of the surface.
Main applications of Hydraulic honed tubing:
Honed tubing and SRB tubes (skived and roller burnished tubes) are mostly used as cylinder tube, such as hydraulic cylinder tube and pneumatic cylinder tubing, which are widely used for manufacturing and repairing hydraulic cylinders and pneumatic cylinders. As honed tube usually has very accuracy dimension tolerance and good surface smoothness, so this product is also used in applications where precision dimension or high smooth surface is need.
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Shandong Guanzhou Iron and Steel Group Co., Ltd. , https://www.guanzhouiron.com