Organic solvent evaporation

Colorimetric methods (3, 6-10), some of which are specific, have been developed for the determination of DDT in small amounts. For benzene hexachloride (hexachloro-cyclohexane), chlordan, and toxaphene, however, specific analytical methods have not been developed, and their residues have been evaluated by the determination of organically bound chlorine. The procedure comprises extraction of the insecticide residue from the sample with benzene or other suitable organic solvent, evaporation of the solvent, treatment of the residue with isopropyl alcohol and metallic sodium, and finally determination by standard methods of the amount of chloride ion formed. 

Let organic solvents evaporate, then filter and dry the polymer, and repeat the purification if necessary. 

Vapor The gaseous phase of matter normally from liquid or solid material and observed at normal temperature most organic solvents evaporate and produce vapors. 

The liquid from an LC is compatible with normal IR sampling and is less of a problem. However, LC mobile phases may not be transparent in the IR, and water is a particularly difficult solvent to handle. For volatile organic solvents, evaporation is possible, and the remaining nonvolatile analytes can be deposited in KBr and pressed into pellets. Further discussion can be found in reference 20. 

Decomposition of the double salts to ArHgX is achieved in organic media, e.g., in McjCO or EtOAc, or equally well in HjO. The solid double salt is added in small portions to a stirred suspension of Cu powder in the solvent (ca. 30-50 mL of solvent per 10 g double salt) at ca. 0°C for decompositions in HjO and —50° to — 20°C in McjCO solutions. Complete consumption of the diazonium salt can be tested for using 2-naphthol. In decompositions in H2O, the organomercurials separate, whereas in decompositions in organic solvents evaporation of the solvent and extraction of the residue by a solvent is used to obtain ArHgX. 

Dissolve phenytoin and povidone K 30 together in an organic solvent, evaporate this to... 

When formulating lipophilic materials, techniques often involve the use of organic solvents, interfaces with aqueous solutions, and high-shear forces [6], One of the most often used techniques to encapsulate proteins is the water/oil/water (w/o/w) double-emulsion solvent evaporation technique, in which an aqueous protein solution is emulsified into an organic solution of the matrix material. This primary emulsion is added to an outer aqueous phase in which particles start to harden as the organic solvent evaporates. Alternatively, the solid protein can be added directly to the organic solution in a solid/oil/water (s/o/w) emulsion method [23],... 

Organic solvent evaporates out of emulsion droplets via heat or vaccum towards to droplets hardening (microspheres embryos)... 

A double emulsion(Wi/OAX ii) is formed, and microshpres embryos form as the organic solvent evaporates... 

All problems of reversible lithium electrodes in contact with liquid electrolyte mentioned in Chapter 12 are preserved (dendrite formation and encapsulation) in the case of the operation of a metallic lithium electrode in lithium-air batteries. Besides, additional problems arise in the operation of lithium-air batteries as the positive electrode contacts the atmosphere, the processes of absorption of water vapor, oxygen, and CO2 and their transport through electrolyte to the lithium electrode surface also, organic solvent evaporation through the pores of the positive electrode occurs inevitably. To eliminate the evaporation of liquid electrolyte and prevent water vapor transport through electrolyte, it was suggested to use electrolytes based on... 

After extraction of the lead diethyldlothlocarbamate Into an organic solvent the lead can be removed by shaking with concentrated hydrochloric acid (T3), or the organic solvent evaporated and the residue dissolved In hydrochloric acid (04) followed by colorimetric determination as the dlthlzonate or by some other means. Alternatively, the lead can be determined colorlmetrlcally in dlethyldlthlocarbamate-carbon tetrachloride solution by shaking with excess copper sulfate solution to convert the lead complex Into the copper complex which Is determined at 435 mu (T3). Lead complexed with dlethylammonlum dlethyldlthlocarbamate Is usually removed by evaporating the... 

In the first stage of organic solvent evaporation, its rate is independent on the presence of the polymer. Evaporation rate depends on ... 

Carefully (foaming may occur ) combine the aqueous layers and washes, neutralize if necessary with sodium carbonate, and flush them down the drain with excess water. Since the first distillation fraction may contain some halogenated product, pour it in a container for halogenated organic solvents. Evaporate the petroleum ether from the... 

Ferrocene-containing elastomeric core-shell particles were prepared and tested for their redox- and mechano-chromic response [321]. Patchy hollow capsules were prepared from poly(vinylferrocene)-hZ )c -poly(methyl methacrylate) using an emulsion and partial organic solvent evaporation technique [322]. Upon oxidation. 

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