Oliveira, Sara M.Lopes, Teresa I. M. S.Tóth, Ildikó V.Rangel, António O. S. S.2011-10-142011-10-142006OLIVEIRA, Sara M... [et al.] - A multicommuted flow injection system with a multi-channel propulsion unit: spectrophotometric determination of N-NH4+. In International Conference on Flow Analysis, 10 (Flow Analysis X), Porto, Portugal, 3-8 September, 2006. 27p.http://hdl.handle.net/10400.14/6114engconference object