A spark spectrometry for inclusions content distribution on the surface of large size metallic materials, comprising the following steps: analyzing the surface of large-size metallic materials by spark discharge continuous excitation scanning, obtaining a mixture intensity distribution data of the solid solution and inclusions of an element on the surface of the large-size metallic materials; the relative frequency distribution diagram of spectral intensity is subjected to peak fitting of normal distribution and Gumbel distribution, obtaining an extreme value distribution data of spectral intensity of the inclusions; a size information of the inclusions in a small sample and that of the largest inclusions are correlated with the spectral intensity distribution data of inclusions, obtaining a result of content distribution of the inclusions on the surface of the large size metallic materials. The invention can quickly obtain accurate distribution information of inclusions of various elements on the surface of metallic materials.

A method for quantifying carbon in carbides that allows highly precise and simple quantification of carbon in carbides. The method for quantifying carbon in the carbides includes a combustion process in which the carbides are heated together with a composite member in the presence of oxygen to oxidize the carbon in the carbides to carbon monoxide and/or carbon dioxide, and a quantification process of quantifying the carbon monoxide and/or the carbon dioxide. The composite member includes two or more metal members that have main components that are different from each other.

A method for quantifying carbon in carbides that allows highly precise and simple quantification of carbon in carbides. The method for quantifying carbon in the carbides includes a combustion process in which the carbides are heated together with a composite member in the presence of oxygen to oxidize the carbon in the carbides to carbon monoxide and/or carbon dioxide, and a quantification process of quantifying the carbon monoxide and/or the carbon dioxide. The composite member includes two or more metal members that have main components that are different from each other.

A solid constituent sensor or sensor system that uses one or more radio frequency (RF) or microwave frequency signals transmitted to and/or into a solid sample to aid in making a determination about the solid sample. This is generally referred to as characterizing a solid sample. Characterizing the solid sample can include: detecting one or more constituents in the sample; detecting the lack of one or more constituents in the sample; determining the molecular makeup of homogenous or heterogeneous solid sample; determining whether the solid sample has an expected chemical composition; determining whether the solid sample deviates from an expected chemical composition; identifying the solid sample; and others.

A solid constituent sensor or sensor system that uses one or more radio frequency (RF) or microwave frequency signals transmitted to and/or into a solid sample to aid in making a determination about the solid sample. This is generally referred to as characterizing a solid sample. Characterizing the solid sample can include: detecting one or more constituents in the sample; detecting the lack of one or more constituents in the sample; determining the molecular makeup of homogenous or heterogeneous solid sample; determining whether the solid sample has an expected chemical composition; determining whether the solid sample deviates from an expected chemical composition; identifying the solid sample; and others.

A method for analyzing the content of boron in a cathode active material is disclosed herein. In some embodiments, a method comprises (S1) introducing boron into a cathode active material to prepare a cathode active material sample, (S2) separating a first liquid layer and a first precipitate by dissolving the sample in water, treating the first liquid layer with acid to form a first resulting solution, and measuring the boron concentration in the first resulting solution by inductively coupled plasma optical emission spectroscopy (ICP-OES), (S3) separating a second liquid layer and a second precipitate by dissolving the first precipitate in water, treating the second liquid layer with acid to form a second resulting solution, and measuring the boron concentration of the second resulting solution by ICP-OES, and (S4) measuring the boron concentration of a third resulting solution, obtained by adding acid and hydrogen peroxide to the second precipitate, by ICP-OES.

A method for analyzing the content of boron in a cathode active material is disclosed herein. In some embodiments, a method comprises (S1) introducing boron into a cathode active material to prepare a cathode active material sample, (S2) separating a first liquid layer and a first precipitate by dissolving the sample in water, treating the first liquid layer with acid to form a first resulting solution, and measuring the boron concentration in the first resulting solution by inductively coupled plasma optical emission spectroscopy (ICP-OES), (S3) separating a second liquid layer and a second precipitate by dissolving the first precipitate in water, treating the second liquid layer with acid to form a second resulting solution, and measuring the boron concentration of the second resulting solution by ICP-OES, and (S4) measuring the boron concentration of a third resulting solution, obtained by adding acid and hydrogen peroxide to the second precipitate, by ICP-OES.