A STUDYING SYNTHESIS OF A CHELATE-FORMING SORBENT BASED ON UREA-FORMALDEHYDE AND DIPHENYLCARBAZONE : STUDYING SYNTHESIS OF A CHELATE-FORMING SORBENT BASED ON UREA-FORMALDEHYDE AND DIPHENYLCARBAZONE . IJC [Internet]. 2024 Jun. 21 [cited 2026 May 20];63(6):579-85. Available from: https://or.niscpr.res.in/index.php/IJC/article/view/9006