Chlorine, elemental analysis

The chlorine content can be determined by either chlorine elemental analysis or a potentiometric titration using a chloride-ion electrode. For titration, about 0.2 g. of polymer is heated in 3 ml. of pyridine at 100° for 2 hours. This suspension is then transferred to a 50-mi. beaker containing 30 ml. of aqueous 50% acetic acid and 5 ini. of concentrated nitric acid, and the resulting mixture is titrated against aqueous 0.1 N silver nitrate. 

Materials. GMC and PCLS were synthesized by free radical solution polymerization initiated by benzoyl peroxide as described previously (5,6). Nearly mono and polydisperse polystyrenes were obtained from Pressure Chemical Co. and the National Bureau of Standards respectively. Molecular weight and polydispersity were determined by gel permeation chromatography (GPC) using a Water Model 244 GPC, equipped with a set (102-106 A) of —Styragel columns using THF as the elution solvent. The molecular parameters of the above three polymers are listed in Table I. The copolymer, poly(GMA-co-3-CLS), contained 53.5 mole % 3-CLS and 46.5 mole % GMA, as determined by chlorine elemental analysis. The structure of the copolymer is shown in Figure 1. 

Quaternization Reaction. In a pressure bottle equipped with a magnetic stirrer, the copolymer was dissolved in methanol, and methyl chloride was then added to slight excess. For reaction conditions, see Table VI. After the specified reaction time, the excess methyl chloride was allowed to evaporate, and the polymer was isolated by precipitation into acetone. After purification, the quaternized copolymer was characterized by IR and chlorine elemental analysis. Similar experiments were conducted using equimolar amounts of methyl chloro-acetate. 

C03-0140. An element E forms a compound whose formula is ECI5. Elemental analysis shows that the compound is 85.13% by mass chlorine. Identify the element E. 

Comparative studies of the widely employed spectrophotometric readings at the Soret and Q bands (405 and 630 nm, respectively) and the elemental analysis of copper and nitrogen showed that the spectrophotometric assay based only on the Soret band can overestimate the purity of a preparation. Erroneous data were attributed to an increase in absorptivity at the Soret band when other colored compounds like metal-free analogs and carotenoids are present. Indeed, copper-free chlorin e6 exhibits a specific absorbance 3.6 times greater than that of its coppered counterpart. Therefore, measurements at the Q band (630 mn) and the establishment of the S Q ratio are preferred. 

The proposed structure for the polymer is well supported by liquid state ll, 13C, and nB NMR data and elemental analysis. The formula, BN16C15H3 5, is consistent with the theoretical N/B ratio of 1.7. Since no chlorine is detected in the product, the terminating groups are mainly borylamino, N(CH3)B(NHCH3)2, groups. 

R values were calculated from elemental analysis for carbon, hydrogen, and chlorine. It can be seen again that temperature has a very marked effect on composition. Even at 100°, however, about 16 mol% sulfur dioxide is present. There was also produced a small quantity (1 to 10% of the amount of copolymer) of the cyclic addition product, 3-chloro-2,5-dihydrothiophene-l,1-dioxide, m.p. 99-100°. 

Additional details regarding the samples were obtained by inferring from the elemental analysis the amount of cobalt present as oxide and chloride. The only source of chlorine in these samples is the cobalt chloride dopant. Thus, based on the chlorine concentration we can estimate the amount of cobalt that must be present as cobalt chloride. For example, film t5 is calculated to contain 78.7% of the cobalt as chloride and by difference about 21% as cobalt oxide. Film 7 (which is film 5 after both a 24 hour soa)c and a 24 hour extraction with DMAc) contains 20% of the cobalt... 

Ratz et al. reported on the synthesis of this cyclophosphazene in which the chlorine atoms of NjPjClg are substituted by 2- methyl aziridine (propyleneimine) groups in the presence of H3N or Et3N in benzene. However, the original paper provides only very few characteristics of the sample in question, i.e., elemental analysis and refractive index, n = 1.5071. 

The work reported in this paper concerns the synthesis of a series of chlorinated polymethylstyrenes, prepared by chlorination of both anionically and free radically synthesized polymethylstyrene, and their subsequent characterization by H NMR, 13C NMR, IR and elemental analysis. The preliminary lithographic evaluation of the chlorinated materials is also discussed. 

Table II lists the composition of each chlorinated species, determined by the methods described above. Values obtained from elemental analysis and...

Elemental Analysis. The elemental analyses are presented in Table IV. The atomic ratios H/C for all drinking water samples (nos. 1-10) were between 1.28 and 1.39. These values were comparable to humic acid derived from lake sediments. However, H/C ratios were much lower when compared to the chlorinated model humic substances (e.g., 1.04-1.08 for CFH-1 and CFH-2). Bromine was present in almost negligible quantities, whereas Cl varied between 0.3 and 2.4, and S varied between 0.9 and 2.7 in the drinking water organic matter. All fractions from drinking water showed similar elemental composition. However, they differed from the elemental composition of the CFH samples in all respects, especially in chlorine content. 

According to the elemental analysis of allylated PCTFE (C, 34.48% H, 2.32% Cl, 13.28% F, 46.97%), the combined percentage for carbon, hydrogen, chlorine, and fluorine elements was 97.05. In addition, its IR spectrum (Figure 4) clearly showed the presence of the allyl moiety at 3087 (=CH stretching), 2982, 2886 (CH stretching) and 1643 (C=C stretching) cm-< with concomitant loss of the chloride band at 972 cm-i. Therefore, based on both IR and elemental analyses, we were confident that the addition of PCTFE across the double bond of allyltributyltin was clean, and the subsequent loss of tributyltin species, perhaps as a radical, resulted in allylated PCTFE. 

A highly toxic gas that has been used in chemical warfare gives the following elemental analysis figures 12.1% carbon, 16.2% oxygen, and 71.7% chlorine by mass. Its molar mass is 98.9 g-moU1. Write the Lewis structure of this compound. 

Analysis of particles originating from the use of outdoor fireworks revealed that the majority of the particles was irregular, many were crystalline, and many large flakes were present. A small proportion of the particles were spherical and physically resembled FDR particles. Elemental analysis showed the presence of aluminum, arsenic, barium, calcium, chlorine, copper, iron, potassium, magnesium, sodium, lead, sulfur, antimony, silicon, strontium, titanium, zinc, and zirconium. None of the particles detected would be confused with FDR particles as the primary FDR elements were always accompanied by elements that were clearly of non-FDR source. 

Gravimetric and elemental analysis lead to the following bruto-formula for the products of fullerene chlorination C6oCln (n=2 8). The broad bands in IR spectra (Fig. 2) close to characteristic vibrations for C-Cl bonds (frequencies 885, 850 and 808 cm"1) evidenced the presence of the mixture different isomers in the sample... 

Elemental analysis of chlorinated samples of carbonic nanofibers and multiple wall nanotubes revealed that the abundance of chlorine in compounds obtained is 5,8 and 1,3 mass. %, respectively. 

Copolymerization of Chloro- and Dichloro-/>-xylylene. Trichloro-di-p-xylylene (XVIII) was obtained by chlorination of di-p-xylylene with three molar equivalents of chlorine. Pyrolysis yielded monomers XV and XIX, which were condensed and polymerized on a 90 °C. surface. A quantitative yield of product was obtained. The product was transparent, tough, self-extinguishing, had a softening point above 280°C., and exhibited the correct elemental analysis for copolymer XX. Owing to the low solubility of the chlorinated poly-p-xylylenes, no attempts... 

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