GB/T 15555.6-1995 Introduces the determination of total chromium in solid waste by direct inhalation flame Atomic absirption spectropho-tometry, AAS. The standard is based on the principle of chromium absorption of specific wavelengths of light. Clarify the requirements of atomic absorption spectrophotometer and other instruments, standardize the collection and preparation process of solid waste samples, including crushing and digestion steps. Detail the test operation, from instrument preheating, calibrating, to wavelength selection and determination. Through this standard, the total chromium content of solid waste can be accurately determined, providing key data for solid waste environment threat and risk assessment, treatment and disposal, and helping to carry out environmental protection work.