1. A study was made of the interaction between beryllium ions (Be(NO3)2) and oxalic, malonic, succinic, lactic, citric, maleic, and salicylic acids by determining the H+ ion concentration. It was established that the degree of interaction between Be2+ ions and organic acids can be arranged in the following series: oxalate = malonate > salicylate > maleate + citrate > tartrate > succinate > lactate. 2. The inability of the Be2+ ion to form only slightly disassociated compounds in the reaction with oxalic acid can be used in the determination of aluminum in the presence of beryllium.