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The "Torch" five elemental analyzers use the iodometric method, the gas volume method, and the photometric colorimetric method to measure the content of carbon, sulfur, manganese, phosphorus and silicon in steel materials. Specifically, 1, carbon element analysis: is the gas volume method and non-aqueous titration method (according to GB/T 223.69-1997 standard). The sample is burned in a stream of oxygen at 1250 ° C to oxidize carbon to carbon dioxide. The gas remaining after the combustion of the combusted gas is collected in a gas cylinder and then concentrated, and then absorbed by potassium hydroxide to determine the difference in gas volume. The carbon content obtained by the pressure sensor. 2. Analysis of sulfur element: It is determined by iodometric method or acid-base titration method (according to GB/T 223.68-1997 standard). The sample is burned in an oxygen stream at 1250 ° C to oxidize sulfur into sulfur dioxide gas. The burned sulfur dioxide gas is then absorbed by water to form sulfurous acid. The starch in the iodine solution is used to indicate the end point color and the volume difference of the iodine solution is titrated. The sulfur content obtained by the pressure sensor. 3. Analysis of manganese element: The analytical method used is the silver salt in the photometric colorimetric method - ammonium persulfate oxidation photometric method (according to GB/T 223.63-1988 standard). The sample was dissolved in acid, and under a certain acidity condition, silver nitrate was used as a catalyst, and ammonium persulfate was used to oxidize manganese to permanganic acid, and the absorbance was measured. 4, the analysis of silicon, the use of ferrous reduction in the luminosity colorimetric method - silicon molybdenum blue light method (according to GB/T 223.5-1997 standard). In an acidic solution, silicic acid and ammonium molybdate form a yellow silico-molybdenum heteropoly acid complex, which is reduced to silicon molybdenum blue with stannous chloride, and its absorbance is measured. 5. Analysis of phosphorus element: The stannous chloride molybdenum blue light method (according to GB/T 223.61-1988 standard) in the photometric colorimetric method is used. In an acidic solution, potassium permanganate is oxidized to oxidize metaphosphoric acid to orthophosphoric acid, and ammonium molybdate is used to form a phosphorus molybdenum heteropoly acid, which is reduced to silicon molybdenum blue with stannous chloride, and the absorbance is measured. HJ series five elements analyzer adopts brand computer microcomputer control, electronic balance weighing, desktop printer printing test results; multi-element analyzer test software is fully functional, can completely replace the manual writing work of traditional laboratory, and can be based on each unit Actually, set the detection report format arbitrarily. The five elemental analyzers for the detection of five elements of carbon, sulfur, silicon, phosphorus and manganese in steel are provided by the Technical Department of Nanjing Torch Analysis Instrument Manufacturing Co., Ltd. 