Direct Analysis Methods:

In direct technique, we measure the natural fluorescence of the analyte. A few inorganic species fall under this type while the number of the organic species in this category is quite huge. In the category of inorganic species the lanthanides; cerium and europium being the most general examples, actinides; uranium being the most significant and some other ions like thallium show reasonable intrinsic fluorescence to be determined through the direct method. Therefore, the sensitivities of these determinations are not extremely good.