The Fe content in sewage, pre and post harvested soil post < pre < sewage, Zn content post < pre < sewage, Pb content sewage < post < pre, Cu content sewage < pre < post, Cd content sewage < post < pre.
The Fe content in sewage, pre and post harvested soil post < pre < sewage, Zn content post < pre < sewage, Pb content sewage < post < pre, Cu content sewage < pre < post, Cd content sewage < post < pre.