caa a22 4500 463162269 CHVBK 20180406164751.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10311-007-0099-9 doi (NATIONALLICENCE)springer-10.1007/s10311-007-0099-9 Distributions, cycling and recovery of amino acids in estuarine waters and sediments [Elektronische Daten] [A. Tappin, G. Millward, M. Fitzsimons] Acid hydrolysis of estuarine water samples for the determination of amino acids (AAs) was tested and found to be effective at high (250μM) nitrate concentrations when the anti-oxidant, ascorbic acid, was added to the samples. Hydrolysable AA concentrations were then determined in surface sediments collected from low and high salinity regions of the Tamar Estuary (UK) during winter 2003 and 2004, and in overlying water when simulated resuspension of sediment particles was performed. Concentrations of AAs in sediment samples comprised <50% of particulate nitrogen, fitting the paradigm that most sedimentary nitrogen is preserved within an organic matrix. When sediment samples were resuspended in overlying water (salinity 17.5), the rapid, measured increase in dissolved AA concentrations almost equalled the reported nitrate concentration in the lower estuary, with the subsequent decrease in the total dissolved AA levels suggested that bacterial uptake was occurring. Our data concur with previous studies on nitrogen desorption from sediments and suggest that an understanding of organic nitrogen cycling will be an important aspect of future effective estuarine management. Springer-Verlag, 2007 Amino acids nationallicence Tamar estuary nationallicence Particulate nitrogen nationallicence Acid hydrolysis nationallicence Recovery nationallicence Nitrate-rich water nationallicence Sediment nationallicence Resuspension nationallicence Bacterial uptake nationallicence Tappin A. Marine Institute, University of Plymouth, Drake Circus, PL4 8AA, Plymouth, UK aut Millward G. Marine Institute, University of Plymouth, Drake Circus, PL4 8AA, Plymouth, UK aut Fitzsimons M. Marine Institute, University of Plymouth, Drake Circus, PL4 8AA, Plymouth, UK aut Environmental Chemistry Letters Springer-Verlag 5/3(2007-08-01), 161-167 1610-3653 5:3<161 2007 5 10311 https://doi.org/10.1007/s10311-007-0099-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10311-007-0099-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tappin A. Marine Institute, University of Plymouth, Drake Circus, PL4 8AA, Plymouth, UK aut NATIONALLICENCE 700 1- Millward G. Marine Institute, University of Plymouth, Drake Circus, PL4 8AA, Plymouth, UK aut NATIONALLICENCE 700 1- Fitzsimons M. Marine Institute, University of Plymouth, Drake Circus, PL4 8AA, Plymouth, UK aut NATIONALLICENCE 773 0- Environmental Chemistry Letters Springer-Verlag 5/3(2007-08-01), 161-167 1610-3653 5:3<161 2007 5 10311 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer