Water, Air, & Soil Pollution

, 226:330 | Cite as

Effectiveness and Mode of Action of Calcium Nitrate and Phoslock® in Phosphorus Control in Contaminated Sediment, a Microcosm Study

  • Juan Lin
  • Peihuang Qiu
  • Xiangjun Yan
  • Xiong Xiong
  • Liandong Jing
  • Chenxi WuEmail author


Calcium nitrate and a lanthanum-modified bentonite (Phoslock®) were investigated for their ability to control the release of phosphorus from contaminated sediment. Their effectiveness and mode of action were assessed using microcosm experiments by monitoring the variation of physiochemical parameters and phosphorus and nitrogen species over time following the treatment for 66 days. Phoslock® was more effective reducing phosphorus in overlaying water and controlling its release from sediment. Calcium nitrate improved redox condition at the sediment-water interface and temporally reduce phosphorus in overlaying water but phosphorus level returned back in a long run. Phosphorus fractionation suggested that Phoslock® converted mobile phosphorus to more stable species while calcium nitrate increased the fractions of mobile phosphorus species. Phoslock® generally showed no effect on nitrogen species. Whereas calcium nitrate temporally increased nitrate, nitrite, and ammonium concentrations but their concentrations quickly reduced likely due to the denitrification process. Results suggested that Phoslock® can be more effective in controlling the release of phosphorus from sediment than calcium nitrate. However, calcium nitrate can improve the redox condition at the sediment-water interface, which may provide other benefits such as stimulating biodegradation.


Internal loading Sediment Phosphorus fractionation Nitrogen cycle 



The authors would like to thank the support from the National Major Science and Technology Projects for Pollution Control and Management (2012ZX07104-002-005, 2012ZX07101-007-002), the Major Scientific and Technological Innovation Projects of the Hangzhou City (20131813A04), and the Science and Technology Project of the Ministry of Housing and Urban–rural Development of China (2014-K7-014).


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of HydrobiologyChinese Academy of SciencesWuhanPeople’s Republic of China
  2. 2.Hangzhou Urban River Supervision CentreHangzhouPeople’s Republic of China
  3. 3.College of Chemistry and Environmental Protection EngineeringSouthwest University of NationalitiesChengduPeople’s Republic of China
  4. 4.Graduate University of the Chinese Academy of SciencesBeijingPeople’s Republic of China

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