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When the metal ions were extracted from an aqueous ammonia solution, the metal ion selectivity for extraction was found to decrease in the order Cd<jats:sup>2+<\/jats:sup>&gt; Ni<jats:sup>2+<\/jats:sup>&gt; Cu<jats:sup>2+<\/jats:sup>&gt; Ag<jats:sup>+<\/jats:sup>&gt; Co<jats:sup>2+<\/jats:sup>&gt; Zn<jats:sup>2+<\/jats:sup>. When the aqueous phase contained ethylene diamine, excellent extraction efficiencies of 97% and 90% were observed for the heavy metal ions Cu<jats:sup>2+<\/jats:sup> and Cd<jats:sup>2+<\/jats:sup>, respectively. Under the same conditions the extraction of octahedral type metal ions, namely, Co<jats:sup>2+<\/jats:sup> and Ni<jats:sup>2+<\/jats:sup>, was suppressed. The extraction of transition metal cations by H<jats:sub>8<\/jats:sub>L in ammonia and\/or amine was found to be pH dependent. Detailed analysis of extraction behavior was investigated by slope analysis, the continuous variation method, and by loading tests.<\/jats:p>","DOI":"10.1155\/2018\/4015878","type":"journal-article","created":{"date-parts":[[2018,7,11]],"date-time":"2018-07-11T19:38:28Z","timestamp":1531337908000},"page":"1-11","source":"Crossref","is-referenced-by-count":3,"title":["Host\u2013Guest Extraction of Heavy Metal Ions with<i> p<\/i>-<i>t<\/i>-Butylcalix[8]arene from Ammonia or Amine Solutions"],"prefix":"10.1155","volume":"2018","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0457-666X","authenticated-orcid":true,"given":"Md. 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