RETESTING OF STATE STANDARD SAMPLES OF SOIL MASSES

摘要

A reliable way to ensure the validity of analytical information is to create standard samples, test them in interlaboratory experiments, and use them widely for controls and calibration in analytical practice. Results are examined by the testing, retesting, and additional testing of three well-known standard soil samples: Kursk Chernozem SP-1, Moscow Sod-Podzolic soil SP-2, Caspian Light Chestnut soil SP-3. The samples are recorded with the State Register of Measures and Measurement Instruments as 901-90, 902-90, and 903-90, respectively, with a period of application until the year 2000.