RETRACTED: Changes of nutrients and potentially toxic elements during hydrothermal carbonization of pig manure

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editors-in-Chief. A journal-wide investigation by Elsevier's Research Integrity & Publishing Ethics team identified violations of the journal's policies on conflict of interest related to the submission and review of this paper. Review of this submission was handled by Guest Editor Jörg Rinklebe despite an extensive recent record of collaboration, including co-publication, with one of the paper co-authors (Nabeel Khan Niazi). This compromised the editorial process and breached the journal's policies. The authors disagree withthis retraction and dispute the grounds for it.