Phosphorus accumulation

Xs = slowly biodegradable substrate XAUT = autotrophic, nitrifying biomass XpHA = stored polyhydroxyalkanoate XPA0 = phosphorus-accumulating organisms... 

Fig. 22. Lead and phosphorus accumulation on Pt (A) and Pd (B). [From Williams and Baron (95).]...

Delaney, M.L. (1998) Phosphorus accumulation in marine sediments and the oceanic phosphorus cycle. Global Biogeochem. Cycles 12, 563-572. 

Ali S. Y., Wisby A., Evans L., and Craig-Gray J. (1977) The sequence of calcium and phosphorus accumulation by matrix vesicles. Calcified Tiss. Res. 225, 490-493. 

Froelich P. N., Bender M. L., and Heath G. R. (1977) Phosphorus accumulation rates in metalliferous sediments on the East Pacific Rise. Earth Planet. Sci. Lett. 34, 351-359. 

Table II. Lead and Phosphorus Accumulation on Johnson Matthey Oxidation Catalysts after Engine Testing...

The typical deactivation curves plotted in Figure 8 depict the poisoning of Johnson Matthey platinum metal oxidation catalyst by lead and phosphorus. A section of the spent catalyst was subjected to electron probe microanalysis (Figure 9) the lead and phosphorus density photographs were obtained by monitoring back reflected x-rays. Phosphorus accumulated on the periphery of the washcoat at the gas-solid interface, whilst lead appeared to be more evenly distributed throughout the... 

Figure 12. Sedimentary and geochemical records from oceans, showing dramatic transient shifts in most records in an interval from just before 8 Ma to 4 Ma (shaded), from Filippelli (1997b). Symbols in all records represent averages of 1 Myr intervals, except for normalized sediment flux curve, which represents 0.5 Myr averages. After interval averaging, all records were adjusted to time scale of Cande and Kent (1992) for consistency, (a) Normalized sediment flux in northern Indian Ocean (Rea 1992). (b) Ge/Si ratio in opaline silica from diatoms (Shemesh et al. 1989). (c) of bulk marine carbonates (Shackleton 1987). Although details of different carbon isotope records differ, general trends revealed in this low-resolution record are robust. PDB is Pee Dee belemnite. (d) Phosphorus accumulation rates in equatorial Pacific (Filippelli and Delaney 1994). Peak in accumulation rates is also observed in other parts of Pacific (Moody et al. 1988) and western Atlantic (Delaney and Anderson 1997). These peaks are linked with increased phosphorus input rates from continental weathering (e.g., Filippelli and Delaney 1994). (e) Sr/ Sr record from marine carbonates (Hodell et al. 1990, 1991). (f) of benthic foraminifera (Miller et al 1987).

Moody JB, Chaboudy LR, Worsley TR (1988) Pacific pelagic phosphorus accumulation during the last 10 m.y. Paleoceanogr 3 113-136... 

These observations indicate that the phosphorus accumulation process is irreversible and essentially independent of the presence of an active metal component over the alumina support. Also, the electron microprobe observations suggest that the poison accumulation process is of the progressive shell type in which the saturation concentration of the poison in the poisoned shell and the effective diffusivity of the poison precursor across this shell play an important role. ... 

Figure 20 shows the comparison of measured and calculated total phosphorus accumulation in a four stage fixed bed reactor used by Hegedus in a steady-state. 

Figure 20 Comparison of experimental and predicted total phosphorus accumulation, in the four-stage reactor ...

In epiphyseal plate cartilage growth and mineralization, nor in the mineralization process of bone. Of considerable Interest is that the vitamin D-deficient animals infused with calcium and phosphorus accumulated calcium and phosphorus in their bones to a much greater extent than animals given vitamin D. O This probably is the result of a failure of the resorption process in vitamin D deficiency, and suggests that vitamin D must play an Important role in the bone modeling and remodeling process. 

Phosphorus accumulation in wetlands is regulated by vegetation, periphyton and plankton, plant litter and detrital accumulation, soil physicochemical properties, water flow velocity, water depth, hydraulic retention time, length-to-width ratio of the wetland, phosphorus loading, and hydrologic fluctuations. In evaluating wetlands for phosphorus accumulation, it is necessary to consider the following ... 

As discussed earlier, most of the phosphorus entering wetlands accumulates within the system. Surface soils in nutrient-impacted wetlands are often enriched as a result of recent accumulation, decomposition processes, and remobilization of phosphorus from subsurface soils to surface through plant uptake and deposition as detritus material. Thus, total phosphorus content of surface soils is higher than that of subsurface soils. Similar total phosphorus profiles have been seen for many wetlands and aquatic systems. In the impacted site, subsurface total phosphorus content can also represent the background levels of phosphorus for these soils, assuming that the surface material is the result of recent accumulation. Much of this phosphorus accumulation is due to organic matter accretion (detrital matter deposition) associated with phosphorus sorption to particulate matter. 

FIGURE 9.5 Long-term phosphorus accumulation rates in the northern Everglades. (From Reddy et al., 1993.)... 

The precipitation of phosphorus as calcium phosphate has been studied extensively by soil scientists in evaluating applied fertilizer reactions. Initial adsorption of phosphorus onto calcite is followed by precipitation as calcium phosphate. Similar reactions can occur at the soil-flood-water interface of calcareous wetlands. For example, long-term phosphorus accumulation in the Everglades marsh is linearly correlated with calcium accumulation, suggesting the possibility of phosphorus and CaCOj interactions (Reddy et al., 1993). 

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