GB/T 4333.8-1988 Specification Determination of calcium in ferrosilicon by atomic absorption spectroscopy (AAS). Based on the absorption characteristics of calcium for specific wavelengths of light, the standard specifies the requirements for AtomicAbsorption Spectroscopy equipment. Detailed description of ferrosilicon sample collection and prepative procedures, such as crushing and acid dissolution steps. Standardize test operations, covering instrument preheating, calibrating, wavelength selection and measurement. According to this standard, calcium content in ferrosilicon can be accurately determined, providing key data for quality control of ferrosilicon products and performance evaluation in steel and other industries, and helping related industries to control product quality.