Relation between Mg and

A veiy important consequence of the latter equation is that when A. = 1, there exists a critical value of molecular weight M = M for which p = Pc and we obtain the relation between Mg and Me as... 

The relation between Mg and chloride is most informative. Because the correlation between Ca and chloride is excellent (Fig. 2B), we present the data as a scatter plot of Mg against Ca (Fig. 3). It must be stressed again that our depth intervals are imposed by sampling limitations, and samples are unavailable at intermediate depths in areas where no oil or gas production occurs. Clearly, Fig. 3 shows that shallower waters are progressively and systematically enriched in Mg relative to Ca (or chloride). Each depth interval has a characteristic Mg/Ca (or Mg/Cl) ratio, and that ratio varies systematically in the dip section. 

Experimental results of various polymers show that the critical molecular weight Me is about 2.4 times the value of Mg (determined according to Eq. (8.2)). This observation indicates the close relation between Mg and Mg. 

The EC (pS cm-1) and the TDS (mg L ) both reflect the water ionic content, i.e. the dissolved load also called water salinity. The EC, easily obtained compared to chemical data, is thus widely documented in the CHEBRO database (n = 2,860 versus 999 complete major element analyses). These two parameters (EC and TDS) are linked by a linear relation TDS (mg L ) = b EC (pS cm-1), with a mean b factor 0.54 < b < 0.96 according to water types and range of salinity [21, 22], The linear relations between TDS and EC were calculated for each monitoring station, b factor ranging from 0.713 (Arga) and 0.86 (Aragon), whereas the Ebro River stations present less variability (0.774—0.798) with R2 always better than 0.72, all the relations are summarised in Table 1. These relations are very similar to that defined for the whole Ebro basin with b = 0.81 [23]. 

There appears to be some relation between composition and mode of origin but with the present data, it is difficult to deduce. In general, the high-Mg, low-Al montmorillonites are most likely to have formed by the alteration of volcanic material and the high-Al beidellite type, to have been of hydrothermal origin or to have been formed as gouge clay and soil clay. In the soil clays much of the excess A1 is present as hydroxyl A1 in the interlayer position. 

Attapulgite-palygorskite clays lie between the Mg-rich and R3+-rich sheet clays. Thus, a continuous series exists between Mg and R3+. The Mg/R3+ ratio in this series is related to the relative amount of filled octahedral positions per total positions available. The dioctahedral clays theoretically have 67% of their total octahedral positions filled the attapulgites 80% the sepiolites 90% and the trioctahedral clays approximately 100%. Fig.28 shows a plot of percent octahedral occupancy versus R2+/r3+ + r2+ inustrating this relation. As R2 + is replaced by R3 + there is a gradual increase in unoccupied positions to satisfy charge requirements. 

The quadrupole interactions of Tc-99 nuclei in polycrystalline pertechnetates MTCO4, where M = Li, K, NH4, ND, Me N, Et4N, BU4N, Ph4N or Ph4As and Mg(Tc04)2 have been studied the quadrupole coupling constants(QCC) of Tc nuclei in these compounds were determined from N.M.R. spectra and the relations between QCC and their structures discussed. 

Pancreatitis was attributed to metronidazole in a 61-year-old woman given intravenous metronidazole 500 mg 6-hourly (22). The relation between pancreatitis and metronidazole in this case was less convincing than in previously reported cases, as there was no rechallenge. 

As shown before, me is a function of stressed state ( > and an important parameter for the failure process, and the functional form cannot be introduced from theoretical considerations in this stage. However, we can determine it by experiment, particularly by creep failure experiment because of a simple relation between and mg as shown in eq(7). 

Within some individual samples, including both early and late calcites. Mg and Fe display a positive covariation that may be related to zoning (Fig. 6). If analogy can be made to the between-sample covariation, it is possible that this zoning relates to a temporal trend of relatively high contents of both Mg and Fe in early precipitates and lower concentrations in later ones however, there is no direct petrographic evidence to support the existence of this trend. Similar positive covariations between Mg and Fe have been reported in other studies of carbonate cementation in sandstones (e.g. Prosser et al., 1993 Milliken et ai, this volume). 

This phenomenon could he related to the linding that the intermediate cyclopropyl radicals that attack the solvent in pure Did are not converted to RMgX when. solvent attack is blocked (Section 7.2.9, Table 7.d the behavior is different in DliH/MgBis. d ill-, and THI/MgCD) 97[. It is possible that the initial pari of the reaction in pure Did leads to enough Mglii i near the surface to form a layer, possibly thin, of ellterate. sandwiched between Mg/ and the less polar and viscous hulk solution. 

---