차아인산을 이용하여 모의 폐액에 함유된 팔라듐을 선택적으로 환원 침전시키는 연구를 수행하여 얻은 결과는 다음과 같다. 팔라듐을 환원 침전시키기 위해서는 차아인산 농도가 약 0.03-1.0M, 질산농도가 약 1.0M, 정치시간이 48시간 이내가 좋았다. 이 조건에서 팔라듐의 침전율을 99% 이상이었으며, 공존원소인 로듐, 루테늄, 세슘, 니켈과 철들은 거의 침전되지 않았으나 스트론튬만이 약 25% 침전되었다. 그리고 팔라듐의 침전율은 차아인산 농도가 증가함에 따라 증가하고, 질산농도가 증가하면 감소하였다.

The separation of palladium from the simulated liquid wastes was experimentally examined in a reduction process with hypophosphorous acid. The obtained main results were as follows: A favorable hypophosphorous acid concentration region was found to be from 0.03 M to 1.0 M, The appropriate nitric acid concentration was confirmed to be about 1.0 M. The suitable stagnant time was found to be within 48 hours. The precipitation fraction of palladium in the simulated liquid wastes was determined to be over 99%. The precipitation fraction af other elements(Rh, Ru, Cs, Ni and Fe) in the simulated liquid wastes was extremely low, and that of Sr was about 25%. The precipitation fraction of palladium was improved with increasing hypophosphorous acid concentration and decreasing nitric acid concentration.