2.3. Calibration
Pure solid standards were mixed in various ratios of metal
chelates with their respective unreacted acids. Each of these calibration
mixtures was then blended with an equal mass of the internal
standard, sodium dicyanamide. Each mixture was then
subjected to blending in a ball mill grinder for five minutes and
stored under desiccation until scanned. Each analytical sample was
mixed with an equal mass of internal standard, dried, and scanned
in similar fashion to the calibration standards.