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The CAS Registry Number is similar to a telephone number and has no significance in terms of the chemical nature or hazards of the material. The CAS Registry Number can be used to locate additional information on the material, for example, when searching in books or chemical data bases.
Chrome azurol S (CAS) is a method that can be used to detect the mobilization of iron. In many soils iron is not often in an abundant form that plants can readily uptake and use.Siderophores are produced by rhizosphere bacteria to help enhance plant growth by increasing the availability of iron near the root (1).o perform CAS analysis a strong ligand (e.g. siderophore) is added to a highly colored iron dye complex. When the iron ligand complex is formed the release of the free dye is accompanied with a color change (7). Since CAS assay is high in sensitivity it is able to be used on agar plates.