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I. INTRODUCTION II. METHODS A. Sample Preparation 1. Synthetic Groundwater 2. Humic and Fulvic Acid 3. Radionuclides 4. Crushed Basalt 6 B. Experimental Procedures 6 III. EFFECTS OF REACTION WITH BASALT ON SOLUTION pH AND CHEMISTRY 7 A. Procedure 7 B. Results 8 IV. EFFECTS OF HUMIC ACID ON NUCLIDE PARTITIONING IN SYNTHETIC GROUNDWATER 13 A. Americium Partitioning 13 1. Variable pH Groundwater 13 2. pH-Adjusted Groundwater 13 B. Neptunium Partitioning 17