Radionuclide uptake by colloidal and particulate humic acids obtained from 14 soils collected worldwide  
  PI: Peter H. Santschi 
  Version: 2018-05-15 
  Notes: “-” denotes data not available due to the undetectable activity in particulate (>0.45 µm) or truly dissolved phases (<3 kDa). 
         "nd" indicates AVG and STD were not computed for those observations 
         "AVG" = average 
         "STD" = standard deviation