近几年来,在质量计量中,天平的灵敏度不断提高,但是对于几 mg 的样品,要使测量精度达到μg的程度也是不容易的。在测量这种微小质量时,校准天平的砝码的精度、天平的性能、测量技术、测量环境和被测物各天平的影响,被测物的物理性质和化学性质都将产生误差。因此,要知道实际的测量精 In recent years, the sensitivity of balances has been constantly increasing in mass measurement, but it is not always easy to achieve a measurement accuracy of μg with a few mg of sample. When measuring this tiny mass, the accuracy of the weight of the balance, the balance’s performance, the measurement technique, the measurement environment, and the balance of the test object affect the physical and chemical properties of the test object. Therefore, to know the actual measurement of fine