*R. Soc. open sci.* **5**, 181565. (Published Online 23 October 2018). ([doi:10.1098/rsos.181565](http://dx.doi.org/10.1098/rsos.181565))

There is an error in the second sentence of the Introduction in the published paper. The sentence should read: 'As(V) is also capable of retaining negative charge in its phosphate analogue arsenate...'.
