Modified Bentonite with Dithizone as Nano Clay Mineral Adsorbent for Solid Phase Extraction of Silver Ions. - Shakerian, Farid; Dadfarnia, Shayessteh; Shabani, Ali Mohammad Haji; Saeidi, Mahboubeh; Hosseini, Seyed Mohammad Sadegh (Croatica Chemica Acta, 2016)