Release characteristics of sediment phosphorus in all fractions of West Lake, Hang Zhou, China

The role of Fe(III) on phosphate released during the photo-decomposition of organic phosphorus in deionized and natural waters

“…Some studies demonstrated that dissolved nutrients, such as NH 4 þ and PO 4 3À could be released when marine and estuarine resuspended sediments were irradiated by sunlight (Kieber et al, 2006;Southwell et al, 2010Southwell et al, , 2011Zhang et al, 2016). After irradiation for 6 h, the release rate for total dissolved nitrogen and phosphate were 2.2 ± 0.5 mmol g À1 h À1 and 0.09 ± 0.005 mmol g À1 h À1 , respectively.…”

Dynamic Assessment of Comprehensive Water Quality Considering the Release of Sediment Pollution

“…The water samples were carried out in accordance with the "Water and wastewater monitoring and analysis method (Fourth Edition), Beijing: China Environmental Science Press, 2002". The sediment samples of total nitrogen and total phosphorus were measured by Kjeldahl determination and the Standard measurements and testing (SMT) protocol method [2,5]. The monitoring results were expressed with average values and the errors of the parallel experiments were less than 5%.…”

“…Sediment samples All experiments are carried out in triplicate and averaged, with relative errors less than 5%. Based on the experiment results, the release amount of nitrogen and phosphorus in sediments under different concentrations of each sampling site are calculated [5,6]:…”

“…In addition, sediment pollution has dual characters of being a source and a sink [7]. In general, the flux direction of liquid pollutants is upward, and the intensity is associated with the concentration of the overlying water [5,8,9], while the flux direction of solid pollutants is the opposite, especially sand, minerals, biological [5,8,9], while the flux direction of solid pollutants is the opposite, especially sand, minerals, biological residual bodies, and solid waste [10]. The release of sediment pollutant is a complicated process which is affected by multiple factors which change constantly [11].…”

“…Noteworthy, primary or secondary pollutants in the basin would enter the reservoirs, lakes, rivers, or oceans due to rainfall erosion and river transportation, and then gradually accumulate at the bottom and result in sediment pollution [2]. Sediment pollutants have characteristics of coexistence of aqueous-biological-sedimentary phases [3], and pollutants will release from the sediments under the influence of external conditions, such as dissolved oxygen, hydrodynamics, pH, temperature, and the pollutant concentration in the overlaying water [4][5][6]. In addition, sediment pollution has dual characters of being a source and a sink [7].…”