Total phosphorous

The total phosphoms content of the sample is determined by method AOCS Ja 5-55. Analysis of phosphoUpid in lecithin concentrates (AOCS Ja 7-86) is performed by fractionation with two-dimensional thin-layer chromatography (tic) followed by acid digestion and reaction with molybdate to measure total phosphorous for each fraction at 310 nm. It is a semiquantitative method for PC, PE, PI, PA, LPC, and LPE. Method AOCS Ja 7b-91 is for the direct deterrnination of single phosphoHpids PE, PA, PI, PC in lecithin by high performance Hquid chromatography (hplc). The method is appHcable to oil-containing lecithins, deoiled lecithins, lecithin fractions, but not appHcable to lyso-PC and lyso-PE. 

Concentrations of total phosphorous (TP) mostly exceeded those of DRP and exhibit a different pattern (Fig. 5). During high flow conditions, concentrations of TP and SS both show high values that indicate a good correlation between these two chemical parameters. As an extreme, the weekly sample during a high flow event... 

Fig. 5 Concentration ranges (5%, 50%, and 95% percentiles) of total phosphorous (TP) in five glacier streams (Gla), two alpine streams (Ver, Cal), one prealpine stream (Erl), three alpine rivers Rhine (Rhi), Rhone (Rho), and Ticino (Tic) and the midland river Thur (Thu). Database see legend for Fig. 4...

Table 9. Characteristics of the UV method for total phosphorous measurement (without dilution)...

Colina, M., Ledo, H., Gutierrez, E., Vilalobos, E., and Marin, J., Determination of total phosphorous in sediments by means of high-pressure bombs and ion chromatography, J. Chromatogr. A, 739, in-in, 1996. 

T. Korenaga and K. Okada, Automated System for Total Phosphorous in Waste Waters by Flow Injection Analysis [in Japanese]. Bunseki Kagakuy 33 (1984) 683. 

Zarbock, H.W., Janicki, A.J. and Janicki, S.S. (1996). Estimates of Total Nitrogen, Total Phosphorous, and Total Suspended Solids to Tampa Bay, Florida, Tampa Bay National Estuary Program Technical Publication 19-96, St. Petersburg, Florida. 

S. Hinkamp, G. Schwedt, Determination of total phosphorous in waters with amperometric detection by coupling of flow-injection analysis with continuous microwave oven digestion, Anal. Chim. Acta 236 (1990) 345-350. 

R.L. Benson, I.D. McKelvie, B.T. Hart, Y.B. Truong, I.C. Hamilton, Determination of total phosphorous in waters and waste waters by on-line UV/thermal induced digestion and flow-injection analysis. Anal. Chim. Acta 326 (1996) 29-39. 

P MRS has been used to study the metabolism of the placenta during late and early preeclampsia. In early onset preeclampsia, the level of PDE compared to total phosphorous signal, and the ratio of PDE/PME, were higher compared to levels in control placenta. In normal pregnancy, PDE and PDE/PME increased from 22 to 41 weeks gestational age. No differences were found in metabolites levels between late preeclampsia and controls. 

There is a small loss of water during reaction, and this must be replaced continuously by addition of water to the feed gases to maintain catalyst performance. The specifications for early polymerization catalysts are given in Table 6.2. Total phosphoric acid (wt%) is the amount of acid that has combined with the support and that cannot be extracted with cold water. The specifications of two typical dehydrogenation catalysts are given in Table 6.3... 

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