Retraction Note to: Ecotoxicology (2014) 23:2025–2029 DOI 10.1007/s10646-014-1360-1

This article has been retracted at the request of the Editor-in-Chief. The article was examined following the COPE guidelines with regard to suspected plagiarism. The article was found to contain a substantial amount of material, without proper referencing, from the previously published articles entitled:

Böhlke JK, Smith RL, Hannon JE (2007) Isotopic analysis of N and O in nitrite and nitrate by sequential selective bacterial reduction to N2O. Anal Chem 79(15):5888–5895. doi:10.1021/ac070176k

Granger J, Sigman DM, Prokopenko MG, Lehmann MF, Tortell PD (2006) A method for nitrite removal in nitrate N and O isotope analyses. Limnol Oceanogr Methods 4(7):205–212. doi:10.4319/lom.2006.4.205

Sigman DM, Casciotti KL, Andreani M, Barford C, Galanter M, Böhlke JK (2001) A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater. Anal Chem 73(17):4145–4153. doi:10.1021/ac010088e