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测定物质组成是化学研究的主要课题之一,确定样品成分意味着测量样品中化学元素的量。在国际单位制中,物质的量定义为和样品中指定基本实物粒子数成比例的物理量。物质的量测量不仅指在宏观水平上测定摩尔数,还指在微观水平上测定指定的基本实物粒子数。世界上,每天人们都要做各种物质成分的测量。例如,医疗中化学成分测量,食物中营养成分和添加物成分测量,以及环境污染物成分测量等。测量
Determining the composition of a chemical is one of the major topics in chemical research. Determining the composition of a sample means measuring the amount of chemical elements in the sample. In the SI system, the amount of a substance is defined as a physical quantity that is proportional to the number of particles in a sample that is specified as the number of basic physical objects. Measurement of the amount of matter means not only the determination of the number of moles at the macro level but also the determination of the number of particles of the specified basic substance at the microscopic level. In the world, every day, people have to measure the composition of various substances. For example, the measurement of chemical composition in medicine, the measurement of nutrients and additives in foods, and the measurement of environmental pollutants. measuring