Distributions, cycling and recovery of amino acids in estuarine waters and sediments

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• 作者：A. D. Tappin ; G. E. Millward and M. F. Fitzsimons
• 关键词：Amino acids ; Tamar estuary ; Particulate nitrogen ; Acid hydrolysis ; Recovery ; Nitrate ; rich water ; Sediment ; Resuspension ; Bacterial uptake
• 刊名：Environmental Chemistry Letters
• 出版年：2007
• 出版时间：August, 2007
• 年：2007
• 卷：5
• 期：3
• 页码：161-167
• 全文大小：289 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geochemistry
  Analytical Chemistry
  Biochemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Soil Science and Conservation
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1610-3661

文摘

Acid hydrolysis of estuarine water samples for the determination of amino acids (AAs) was tested and found to be effective at high (250 μM) 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.