Effect of Soil Type on the Extractability of 237Np, 239Pu, 241Am, and 244Cm as a Function of pH Nishita, H. ; Wallace, A. ; Romney, E. M. ; Schulz, R. K. Abstract Publication: Soil Science Pub Date: July 1981 DOI: 10.1097/00010694-198107000-00005 Bibcode: 1981SoilS.132...25N