Phosphorus adsorption by sediment considering mineral composition and environmental factors

Regime of fluvial phosphorus constituted by sediment

“…A batch of strictly composed samples was prepared by adding a different amount of sediment (0.3, 0.6, 1.5, 3, 6, 15, 30, 60, 150 or 300 mg) to 30 mL of a P solution with initial P concentrations (denoted as C dp0 ) of 0.001, 0.01, 0.1, 0.5, 1, and 10 mg/L. These samples were then processed in an incubator shaker and shaken continuously for 24 h to achieve an equilibrium adsorption (Li et al, 2021). Next, the C dp under equilibrium conditions was measured after passing each sample through a 0.45-μm filter (see section 2.1) and the C tp was calculated according to the conservation of matter (C tp = C dp0 + Sd pp0 ).…”

“…Actually, the adsorption behaviors of natural sediment would be significantly affected by sediment grain size (Meng et al, 2014), and the grain size is crucially important for the transport of P in the flow (Zhou et al, 2015). Therefore, sediment grain size should also be considered when investigating the effects of sediment on P. Furthermore, most of the experimental studies on P adsorption/desorption focused on the maximum adsorption capacity of P by sediment (Zhou et al, 2005;Omari et al, 2019;Li et al, 2021), paying little attention to the buffering effects of river sediment against P pollution. Moreover, most experiments only explored a narrow range of values of sediment and P concentrations, while these values are generally one or two orders of magnitude higher than those in the natural rivers (Zhou et al, 2005;Wang et al, 2009;Omari et al, 2019).…”

Modelling rainfall‐induced phosphorus loss with eroded clay and surface runoff

“…In the model system, the partition coefficient K d can be described as follows: $$$$ {K}_{\mathrm{d}}=\frac{q_{\mathrm{e}}}{C_{\mathrm{w}}}, $$$$ where q e is the adsorbed inorganic P concentration at equilibrium (mg/g), which depends on the maximum adsorbed inorganic P concentration (mg/g) and the influence of environmental factors. $$$$ {q}_{\mathrm{e}}={q}_{\mathrm{max}}F, $$$$ where q max is the maximum adsorbed inorganic P concentration, and F is the function of environmental factors. The q max is mainly determined by intrinsic particle factors and expressed as a function of the median particle size, surface‐active site density, surface morphology and mineral composition Li, Huang, et al (2021), $$$$ {q}_{\mathrm{max}}=f\left({D}_{50},{N}_{\mathrm{s}},{F}_{2\mathrm{a}},{p}_{\mathrm{c}}\right), $$$$ where D 50 is the median particle size, N s is the surface‐active site density determined from crystallographic characterization, F 2a is an average morphology descriptor, and p c is the mass percentage of each mineral of the soil/sediment.…”

“…However, K d is affected by the characteristics of sediment and by environmental factors, such as mineral composition, sediment concentration, SP concentration, and pH Huang et al, 2016;Li, Huang, et al, 2021;Wu, Fang, et al, 2020). Generally, these factors vary overtime during the soil erosion process, making the quantification of K d and P transport difficult.…”

Temporal and Spatial Variation Characteristics of Water Quality in the Middle and Lower Reaches of the Lijiang River, China and Their Responses to Environmental Factors

“…These studies focused mainly on local areas or unique factors, and the results and scope have some limitations. The impact of environmental factors on the endogenous release of sediment has also attracted much attention [23,24], but these research findings are regional and primarily qualitative. Rivers often cross a vast region, and coastal topography, environment, climate, and other conditions can vary considerably along the course of the river.…”