| Fluorescence
          Components | 
        Peak    position 
          λEx/Em(nm) | 
        Literature    reported | 
       
      
        | Description  | 
        Ex/Em (nm)  | 
        Reference  | 
       
      
        | C1 | 
        230,280/320 | 
        tyrosine-like | 
        230/325-350 | 
        [1]  | 
       
      
        | 280/320-350; | 
        [25]  | 
       
      
        | 270-280/320-350; | 
        [26]  | 
       
      
        | C2 | 
        240,305/355 | 
        tryptophan-like | 
        <250(290)/360 | 
        [27] | 
       
      
        | <250 (290)/360 | 
        [28] | 
       
      
        | C3 | 
        270,340/480 | 
        Terrestrial    humic-like | 
        230-260/380-480 | 
        [29]  | 
       
      
        | 320-360/420-480 | 
       
      |