106results about How to "Analytical data is accurate" patented technology

The invention relates to a method for determining the contents of carbon and sulfur in iron-containing dust mud. The method is characterized by comprising the following steps: adding iron and tin fluxing agents into a special infrared sulfur-carbon crucible, adding an iron-containing dust mud sample with the mass of m into the crucible, and adding a tungsten fluxing agent; putting the crucible into a high-frequency infrared sulfur-carbon analyzer, heating the sample by virtue of a high frequency furnace in oxygen stream to respectively generate CO2, CO and SO2 from the carbon and the sulfur in the presence of the fluxing agents and oxygen, after carrying out dust filtration and dehumidification on the oxygen which serves as carrier gas, feeding the oxygen into an SO2 infrared absorption tank, and determining the content of the sulfur; and converting CO in the gas, which is subjected to SO2 measurement, into CO2 by virtue of a catalysis furnace, carrying out desulfuration, feeding the gas into the infrared absorption tank, and determining the content of the carbon. The method has the advantages that analysis steps are few, the chemical interference is slight, the analysis cycle is short, and the accuracy is high.

The invention relates to a method of detecting surface lithium of a ternary cathode material. The method includes stirring and mixing a ternary cathode material sample and water, filtering the mixture to obtain filtrate that is a solution to be detected, adding a phenolphthalein indicator into the solution to be detected, titrating the mixture with a standard hydrochloric acid solution until the mixture is colorless, recording the volume V1 of the consumed standard hydrochloric acid solution, then adding a methyl red indicator into the mixture, titrating the system with a standard hydrochloric acid solution until the color is turned from yellow to orange, heating and boiling the system to allow the color to be turned back from the orange to yellow, cooling the system to room temperature, titrating the system with the standard hydrochloric acid solution until the system is reddish that is adopted as a terminal point, recording the volume V2 of the consumed standard hydrochloric acid solution in the whole titrating process, and calculating the surface lithium content of the ternary cathode material according to a formula (1). According to the method, the surface lithium content of the ternary cathode material is detected through selecting the indicators and through an acid-base titration process, influences of an intermediate that is LiHCO3 on titration data are taken into full consideration, the surface lithium content measuring error of the acid-base titration process is reduced and detection accuracy is improved.