Calcium lead and

Reactant for /-butyl phenolic resins. Magnesium oxide reacts in solution with /-butyl phenolic resin to produce an infusible resinate (Fig. 36) which provides improved heat resistance. The resinate has no melting point and decomposes above 200°C. Although oxides of calcium, lead and lithium can also be used, they are not as efficient as magnesium oxide and also tend to separate from solution. Where clear adhesive solutions are required epoxide resins, zinc-calcium resinates or zinc carbonate can be used. 

G.J. Long, J.F. Rosen, F.A.X. Schanne, Lead activation of protein-kinase-C from rat-brain - determination of free calcium, lead, and zinc by F-19-Nmr, J. Biol. Chem. 269 (1994) 834-837. 

Detection and determination.—The periodates behave towards reducing agents like the iodates. They are usually but slightly soluble in water and readily soluble in dil. nitric acid. When soln. of sodium periodate are added to barium, strontium, calcium, lead, and silver salts, precipitates of dimesoperiodates are obtained, and the mother liquor has an acid reaction—the silver salt is pale yellow, the others white—silver iodate is also white. The silver precipitate becomes dark red when boiled in water the fresh precipitate is very soluble in ammonia, the dark red... 

Dupre61 in 1901 reported experiments which indicated that the picrates of calcium, lead, and zinc, formed in situ from melted picric acid are capable of initiating the explosion of that material. Kast62 found that the dehydrated picrates are more sensitive than those which contain water of crystallization. The data tabulated... 

In Tables 2.14 and 2.15, the average compositions of calcium-, lead-, and calci-um-lead-montmorillonite are listed as atomic percent. (The data were determined by energy-dispersive x-ray spectroscopy, which cannot determine hydrogen content. Note that the hydrogen content is not indicated.)... 

Adeyemi, A. O., and Gadd, G. M. (2005). Fungal degradation of calcium-, lead- and silicon-hearing minerals. Biometals 18, 269-281. 

Prepare a spreadsheet for Figure 9.2, log Kj vs. pH for the EDTA chelates of calcium, lead, and mercury. This will require calculating for EDTA and the Kf values for the chelates of calcium, lead, and mercury. Calculate at 0.5 pH intervals. Compare your plot with Figure 9.2. 

Another requirement of the monochromator is that it should be capable of using wide slits—i.e., wide bandpasses, for elements whose emission spectra are uncomplicated. Zinc, arsenic, selenium, calcium, lead, and the alkalis are examples of such elements. When the bandpass is wider, more energy can be passed through the monochromator and the obtainable precision and detection limits are better. 

IS best crystallised from alcohol it melts at 84° C. It is very sparingly soluble in hot water. Its alcohol solution with an excess of sodium hydroxide yields the sodium salt as a thick, white precipitate. The potassium, ammonium, calcium, lead and barium salts are know n, the last-named containing three molecules of water. The double salt with phenylhydrazine is sparingly soluble m water and melts at 171° C. 

Hydroxymethylphosphinic acid, HO.CH2-PO(OH)2.—This acid is said to result from the interaction of trioxymethylene and phosphorus trichloride. It crystallises in wRite, rectangular plates, very hygroscopic and deliquescent, and it is a dibasic acid. The following salts are known barium salt, pearly plates silver salt, w-hite amorphous pow der pyyidinium salt, HO.CH2.PO(OH)2.C5H5N, ghstening needles, M.pt. 105° C. calcium, lead and zinc salts, w hite, amorphous powders copper salt, pale blue ferric salt, pale yellow calcium and barium hydrogen salts cannot be obtained in solid form,... 

The float current for the calcium-lead and antimonial lead batteries is shown in Fig. 23.43 under float charge at voltages between 2.15 and 2.40 V per cell. It has been found that more than 50 mV positive and negative overpotential is necessary to prevent self-discharge so that 0.005 A float current per 100 Ah of battery capacity is required for the lead-calcium batteries. Antimonial lead batteries initially require at least 0.06 A per 100 Ah, but this increases to 0.6 A per 100 Ah as the battery ages. The higher float current also increases the rate of water consumption and evolution of hydrogen gas. 

As will be discussed in the section on resins, metal oxides also react in solution with r-butyl phenolic resins. The reaction product, an infusible metal resinate, increases the heat resis-aance of adhesive films. Although oxides of calcium, lead, and lithium also exhibit reactivity, magnesium oxide is the most useful and widely used reactant. 

Kohn, R., Hirsch, 1986. Binding of calcium, lead, and copper(II) cations to galactaric and 2,5-furandicarboxylic adds and to D-galacturonic acid and its derivatives. Journal of Collection of Czechoslovak Chemical Communications 51,1150-1159. 

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