What are the methods suggested in this kit based on?

1. ASTM 1657-94: “Standard Practice for Testing Variable-Wavelength Photometric Detectors Used in Liquid Chromatography”
2. ASTM 925-83: “Standard Practice for the Periodic Calibration of Narrow Bandpass Spectrophotometers”
3. NIST Standard Reference Material 935a: “Crystalline Potassium Dichromate for Use as an Ultraviolet Absorbance Standard”
4. NIST Standard Reference Material 2034: “Holmium Oxide Solution Wavelength Standard from 240nm to 650nm”
5. NIST Standard Reference Material 2032: “Crystalline Potassium Iodide Heterochromatic Stray Radiant Energy Standard for Ultraviolet Absorption Spectrophotometry”