caa a22 4500 445815159 CHVBK 20180317145225.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10040-011-0713-6 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0713-6 Comparison of gadopentetic acid (Gd-DTPA) and bromide in a dual-tracer field experiment [Elektronische Daten] [Peter Dulski, Peter Möller, Asaf Pekdeger] Comparaison de l‘acide gadopentetic (Gd-DTPA) et de bromure dans uneexpérience de double traçage At a test site consisting of a storage pond and connected artificial aquifer, the long-time behaviour of gadopentetic acid (Gd-DTPA) was compared with the classic tracer bromide (Br-) in a 70-day dual-tracer experiment. The mixed tracer solution was injected into the oligotrophic pond, which is separated from the aquifer by an infiltration bank. The water drained from the aquifer was returned to the pond together with additional fresh groundwater, causing reduced concentrations of Gd-DTPA and Br- in the system. Transmetallation of Gd-DTPA by rare earth elements and yttrium was negligible but Cu2+ and Ni2+ might have played a role. Adsorption and/or biodegradation of Gd-DTPA were negligible. The decline of Gd-DTPA/Br ratios by 18% in the pond over 68 days was caused by reversible sorption of Br- in the aquifer, which caused variation of Br- background. Thus, Br- behaves less conservatively than Gd-DTPA in the aquifer. Comparison of both proves the suitability of Gd-chelates as tracers in hydrological studies. The advantage of Gd-DTPA as a tracer is that natural Gd3+ in water can continuously be monitored by analysing the suite of naturally occurring rare-earth elements. Thus, stable organic Gd-chelates are determinable with high precision at very low concentrations. Springer-Verlag, 2011 Tracer tests nationallicence Solute transport nationallicence Gd-DTPA nationallicence Bromide nationallicence Germany nationallicence Dulski Peter Deutsches Geoforschungszentrum, Telegrafenberg, 14473, Potsdam, Germany aut Möller Peter Deutsches Geoforschungszentrum, Telegrafenberg, 14473, Potsdam, Germany aut Pekdeger Asaf Free University Berlin, Malteserstr. 74-100, AB Hydrogeologie, 12249, Berlin, Germany aut Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 823-834 1431-2174 19:4<823 2011 19 10040 https://doi.org/10.1007/s10040-011-0713-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0713-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dulski Peter Deutsches Geoforschungszentrum, Telegrafenberg, 14473, Potsdam, Germany aut NATIONALLICENCE 700 1- Möller Peter Deutsches Geoforschungszentrum, Telegrafenberg, 14473, Potsdam, Germany aut NATIONALLICENCE 700 1- Pekdeger Asaf Free University Berlin, Malteserstr. 74-100, AB Hydrogeologie, 12249, Berlin, Germany aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 823-834 1431-2174 19:4<823 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer