Phosphorus distribution

Phossy water, a waste product in the production of elemental phosphorus by the electric furnace process, contains from 1000 to 5000 mg/L suspended solids that include 400-2500 mg/L of elemental phosphorus, distributed as liquid colloidal particles. These particles are usually positively charged, although this varies depending on the operation of the electrostatic precipitators. Furthermore, the chemical equilibrium between the fluoride and flurosilicate ions introduces an important source of variation in suspended solids that is a pH function. Commonly... 

Figure I. Molecular mass distribution curves from phosphorus-containing poly-ethyleneterephlhalate sample with 0.74% phosphorus modified with sodium salt of diethyl phosphite. Key l, integral curve 2. differential curve and 3, integral curve of phosphorus distribution.

The distribution coefficient is usually greater than unity and is sometimes very large. The rf power dependence of the incorporation of phosphorus and arsenic is compared in Fig. 5.4, in both cases for films deposited near 250 C. The phosphorus distribution coefficient is about 5 at low concentrations and moderate rf power and decreases slowly... 

Eqs. (6.69) and (6.70) are the doping reactions related to the gas-phase and solid-phase concentrations of silicon and phosphorus. The square root law applies to the gas-phase arsenic concentration provided that and are regular (i.e. independent of arsenic concentration). However, the law only applies to the solid-phase concentrations (Eq. (6.70)) if, in addition, is also constant. The variation of the arsenic distribution coefficient with rf power and gas concentration (Fig. 5.4) explains the deviations from the doping law for the solid phase which are shown in Fig. 5.17. The phosphorus distribution coefficient has a much weaker dependence on the rf power and gas concentration, so... 

Phosphorus Distribution. The major sediment phosphorus fraction is that extracted by hydrochloric acid (Table III). Ammonium oxalate-oxalic acid solution extracts somewhat less phosphorus than hydrochloric acid, while sodium hydroxide as well as hydroxylamine extract much less. 

Nriagu (Canadian Center for Inland Waters, unpublished data, 1975) has proposed that basic metal phosphates are important sinks for heavy metals in the environment. In most natural waters of New York State,dissolved basic metals including Pb, Cu, and Zn are at low concentrations (below 10 ug/1), and these metals would not be expected to be a major factor governing phosphorus distribution. 

Ruttenberg, K. C., and M. A. Goni. 1997. "Phosphorus distribution, (C N P) ratios, and delta 13C in arctic, temperate, and tropical coastal sediments tools for characterizing bulk sedimentary organic matter." Marine Geology 139, 123-145. 

Szmant, A. M., and Forrester, A. (1996). Water column and sediment nitrogen and phosphorus distribution patterns in the Florida Keys, USA. Coral Reefs. 15(1), 21—41. 

Guidry M. W., Mackenzie F. T., and Arvidson R. S. (2000) Role of tectonics in phosphorus distribution and cycling. In Marine Authigenesis from Global to Microbial, Spec. Publ. 66 (eds. C. R. Glenn, L. Prevot-Lucas, and J. Lucas). Society for Sedimentary Geology, Tulsa, pp. 35-51. 

Ruttenberg K. C. and Goni M. A. (1997b) Depth trends in phosphorus distribution and C N P ratios of organic matter in Amazon Fan sediments indices of organic matter source and burial history. In Proc. Ocean Drilling Program. Sci. Res. (eds. R. D. Flood, D. J. W. Piper, A. Klaus, and L. C. Peterson), vol. 155, pp. 505-517. 

Figure 6. Phosphorus distribution in Meade Peak (left) and Retort (right) Members of the Phosphoria Formation shown by isograms of average weight percent.

FIGURE 14.27 Phosphorus distribution in the surface sediments of the Arkona Basin in 1988 (top), 2005 (middle), and the relative differences (changes) during that time (bottom). 

Phosphorus distribution in sinking oceanic particulate matter. Mar. Chem., in press. 

The phosphorus deactivation curve is typical type C, and, according to the Wheeler model, this is associated with selective poisoning of pore mouths. Phosphorus distribution on the poisoned catalyst is near the gas-solid interface, i.e. at pore mouths, which confirms the Wheeler model of pore mouth poisoning for type C deactivation curves. Thus we may propose that in the fast oxidative reactions with which we are dealing, transport processes within pores will control the effectiveness of the catalyst. Active sites at the gas-solid interface will be controlled by relatively fast bulk diffusional processes, whereas active sites within pores of 20-100 A present in the washcoat aluminas on which the platinum is deposited will be controlled by the slower Knudsen diffusion process. Thus phosphorus poisoning of active sites at pore mouths will result in a serious loss in catalyst activity since reactant molecules must diffuse deeper into the pore structure by the slower Knudsen mass transport process to find progressively fewer active sites. 

Scinto, L. J. 1990. Seasonal variation in soil phosphorus distribution in two wetlands of south Florida, M.S. Thesis, University of Florida. 

Fig 2.7. Phosphorus distribution in a pleurotus ostreatus colony 48 h after phosphorus addition in the centre of the colony (top). Change in phosphorus distribution the last 24 hours (bottom). From these graphs it is seen that the phosphorus is immobilized in the centre of the colony and it is from this immobilized pool that nutrients are taken for distribution to the other parts of the colony. 

Vaithiyanathan P, Jha PK, Subramanian V (1993) Phosphorus distribution in the sediments of the Hooghly (Ganges) Estuary, India. Estuar Coast Shelf Sci... 

Ste] Thermal analysis, metallographie examination Phosphorus distribution on melting and cooling... 

From the analysis of several archaeological samples by micro-PIXE, Neff and Dillmann (2001) have shown that ores containing important amount of phosphorus were used in ancient Europe to obtain iron by two different processes called the direct one and the indirect one. Phosphorus content was quantified as the heterogeneous phosphorus distribution was observed in the samples. The results confirm the fact that refining of phosphorus pig iron was possible with ancient refining processes. Moreover it seems that the phosphorus distribution ratio could be a discriminating factor to identify the iron making process. 

Experimental Study of Phosphorus Distribution Between Slag and Metal During Duplex Dephosphorus Converter Processing... 

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