RETRACTED: Effect of thiols enrichment on Cr(VI) photo-reduction by natural organic matter (NOM)

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Editor-in-Chief and Author.The author wishes to retract this article because he found errors in the data analysis. The author performed additional experiments, and found that except thiol groups, other sulfur (S) species as products could be also observed in redox reactions between sulfide (as Na2S or H2S) and NOM. Thus, the results and conclusions in this research article are not significant. This was later concluded after substantial investigations. The research was not conducted at Oak Ridge National Laboratory (ORNL). Hongwei Luo is not an employee at ORNL, and his published work was not performed at ORNL. The use of ORNL as a second affiliation for Hongwei Luo is incorrect. This has raised a number of issues including falsification of the affiliation and violation of ORNL publication policy (without ORNL agreement and approval).