Extraction carbon tetrachloride

The carbon tetrachloride extraction removes any benzoic acid which may be present. 

Carbon tetrachloride extracts chlorine monoxide but not HOCl from concentrated HOCl solutions. For the equilibrium, Cl2 0(aq) Cl2 0(CCl4), the partition coefficient at 0°C is 2.22 (55,84). 

Very shock-sensitive and explodes readily when precipitated from aqueous solution. Crystals obtained by slow evaporation of a carbon tetrachloride extract were less sensitive. 

Concawe [8] have described a method for the determination of aliphatic hydrocarbons in soil based on carbon tetrachloride extraction followed by infrared spectroscopy or gas chromatography. 

The reaction can be followed by adding an aliquot to eth-anolic silver nitrate solution (Note 9). The reaction is complete when no precipitate of the silver derivative is obtained. Also the disappearance of the infrared absorption band at 3300 cm. (3.03 fx) (ethynyl z)CH) can be followed with carbon tetrachloride extracts of aliquots. 

Kiba et al. propose the separation of technetium from rheniiun by carbon tetrachloride extraction using potassium ethyl xanthate as reducing agent. 

In this method sulfur is determined by carbon tetrachloride extraction of the residue remaining after the ether, water, and acid extractions of the sample. The sum of the sulfur found here and by the ether extraction procedure (Standard Method No 30) represents the total sulfur content. The sulfur removal is followed by acetone extraction for the determination of NC (Nitrocellulose)... 

D90—6a D90— 6b, ppl9—20). Procedures are similar to those described in BurMines Standard Method No 33 and in Section IV of this work Pierson s Procedure 7. Treatment of Acid Extract (Ref ll, ppl360-6l Ref 17, Methods D90—7a to D90—7d). Procedures are essentially the same as described in Section IV of this work, Items 1 to 7 Pierson s Procedure D-8. Carbon Tetrachloride Extraction for Sulfur (Ref 11, p 1361 Ref 17, Method D90— 8). Same as in BurMines Standard Method No 34, described in Section V, Step 1 of this work... 

Bridie et al. [27] have studied the solvent extraction of hydrocarbons and their oxidative products from oxidised and non-oxidised kerosine-water mixtures, using pentane, chloroform and carbon tetrachloride. Extracts are treated with Florasil to remove non-hydrocarbons before analysis by temperature programmed gas chromatography. From the results reported it is concluded that, although each of the solvents extracts the same amount of hydrocarbons, pentane extracts the smallest amount of non hydrocarbons. Florasil effectively removes non hydrocarbons from pentane extracts, but also removes 10-25% of aromatic hydrocarbons. However, as the other solvents are less susceptible than pentane to treatment with Florasil, pentane is considered by those workers to be the most suitable solvent for use in determining oil in water. 

Chloride Carbon -tetrachloride Chloride reacted with phenyl mercuric nitrate to produce phenyl mercury chloride, then carbon tetrachloride extraction, then GLC 0.4mg L- [799]... 

Dalton TP, Li Q, Bittel D, Liang L, Andrews GK (1996) Oxidative stress activates metal-responsive transcription factor-1 binding activity. Occupancy in vivo of metal response elements in the metallothionein-I gene promoter. J Biol Chem 271 26233-26241 Danscher G, Howell G, Perez-Clausell J, Hertel N (1985) The dithizone, Timm s sulphide silver and the selenium methods demonstrate a chelatable pool of zinc in CNS. A proton activation (PIXE) analysis of carbon tetrachloride extracts from rat brains and spinal cords intravitally treated with dithizone. Histochemistry 83 419 22 Danscher G, Jensen KB, Frederickson CJ, Kemp K, Andreasen A, Juhl S, Stoltenberg M, Ravid R (1997) Increased amount of zinc in the hippocampus and amygdala of Alzheimer s diseased brains a proton-induced X-ray emission spectroscopic analysis of cryostat sections from autopsy material. J Neurosci Methods 76 53-59... 

Table II. O.IM Trilaurylmethylammonium Nitrate—Carbon Tetrachloride Extraction of Cerium and Berkelium from Nitric Acid Solutions in the Presence of Sodium Bismuthate...

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