Methanol

“ The atmospheres were generated by calibrated syringe pump. Desorption efficiency (DE) was determined to be 0.92 at 1.3 mg methanol and 0.84 at 0.65 mg methanol per sample. The breakthrough volume was 10.4 L (5% on back section) when sampling 3 a methanol atmosphere containing 541 mg/m in dry air at 0.2 L/min for 52 min. Data gathered using larger silica gel tubes (700 mg front section) under conditions of high humidity were published in P&CAM 247 [4] . ”

“ The recovery of DEA calculated from the methanol concentration varied from 70-95% in different generation runs. After studies were complete, the initial mixing chamber was rinsed with 2 m M HSA and was found to contain 52 mg DEA, and a rinse of the sampling chamber contained 23 mg DEA, indicating that DEA was lost in the generator during sample generation, and explaining the variation in recovery vs. that calculated from the methanol concentration. In the first run, four samples were generated to test the generation system. ”

“ Methanol is flammable and a dangerous fire and explosion risk. It is moderately toxic by ingestion and inhalation. Isopropanol is flammable and a fire risk. Wear appropriate protective clothing and work with these compounds in a well ventilated hood. ”

“ Samplers Air, filtered. are commercially available. Desorbing solution, 5% isopropanol in 95% NOTE: At high relative humidity or high distilled water. methanol concentrations, use a larger 8. Calibration stock solution, 2μg/μL. Add 25.3μL tube: 15 cm long, 8-mm ID, with three Methanol to 10 mL of desorbing solution. sections of silica gel (700 mg, 150 mg, 150 mg) . 2. ”

“ However, the higher the methanol concentration of the samples, the more desirable it is to use the same % of methanol standards as in the samples. b. Using the 50,000 ng/L solution, prepare the working standards 100 ng/L, 500 ng/L and 25000 ng/L, in the matrix solvent. 9. Run controls, 1 for every three rows of the assay to determine possible drift. 10. Zero the reader against air or deionized water before reading the assay. 11. Determine the concentration of alachlor using the data reduction capabilities of the microtiter plate reader, or appropriate software. ”

“ Ingestion of methanol may cause blindness or death. Methanol is a fire hazard (flash point 12 °C) .
SAMPLING: 1. 2. 3. 4.
Calibrate each personal sampling pump with a representative sampler in line. Attach sampler to personal sampling pump with flexible tubing. Sample at an accurately known flow rate between 1 and 3 L/min for a total sample size of 10 to 1000 L. Limit the maximum loading of particulate matter on the filter to about 1 mg. ”

“ Evaporate the acetylated sample to dryness under a gentle stream of nitrogen while warming to 60 °C on a hotplate. Redissolve the residue in 5.0 mL methanol, while agitating the sample in an ultrasonic water for 15 min.
CALIBRATION AND QUALITY CONTROL: 10.
11.
Prepare at least six working standards containing 0.01 to 4.0 μg/mL of the appropriate urea (s) (TDIU, HDIU, and/or MDIU) and 100 μg/mL of 1- (2-methoxyphenyl) piperazine by adding aliquots of calibration stock solutions to 2 mL methanol in a 10-mL volumetric flask. Add 10 μL acetic anhydride to each standard. ”

“ Pipet a 5-mL aliquot of urine into a clean culture tube. 7. Adjust pH to >12 using 10 N NaOH (ca. 0.1 mL) . 8. Add 1 mL methanol. Mix well. 9. Add 5 mL 1:1 diethyl ether:hexane. Shake steadily for 2 min to extract the MBOCA. Centrifuge to separate phases. Transfer the organic phase by Pasteur pipet to a culture tube. Repeat with two additional 5-mL portions of 1:1 diethyl ether: hexane, combining the organic phases. NOTE: Emulsions may form; break them by adding methanol or by repeated centrifugation. 10. Concentrate the extract to ca. 1 mL under a gentle stream of nitrogen in a hood. ”

“ Methanol is superior to isopropanol. Recoveries with isopropanol are greatly improved with a repeat (serial) wipe (11% improvement compared to only about 6% improvement with methanol) . The study and results are reported in the Backup Data Report for NIOSH 9109 [1] . Additional research on surface sample recovery and solvent effectiveness has been reported by Martyny [10, 11] . REFERENCES: [1] Reynolds JM, Siso MC, Perkins JB [2004] . Backup Data Report for NIOSH 9109, Methamphetamine and illicit drugs, precursors, and adulterants on wipes by solid phase extraction, Abridged. ”

“ Improvements were made to enhance the recovery of methanol from silica gel, to improve baseline resolution, and to improve the precision of the method. Desorption efficiency (DE) was determined for three levels using the improved analytical parameters stated on page 2000-1. The average DE for methanol wasdetermined at 20 μg (0.942) , 40 μg (0.945) , and 79 μg (0.942) [1] . The LOD was determined to be 0.7 μg/sample [1] . ”

“ Add 3 mL methanol (or isopropanol if isopropanol was used with the samples in the field) to each calibration standard and media blank. NOTE: If two gauze wipes were routinely used for every sample, increase methanol (or isopropanol) to 4 mL. See Table 7, footnote 2. d. Spike a known volume of analyte spiking solution into each calibration standard by spiking directly onto the media or into solution. Use the spiking volumes suggested in Table 7 to cover the desired range. e. ”

“ Rinse the beaker two or three times with small amounts of methanol and combine the rinsings in the test tube. l. Evaporate the methanol in the test tube to dryness. Derivatization: a. Add 125 μL of BF 3/methanol to each sample or standard tube and screw the cap tightly. ”

“ These samples were expected to contain 1305 μg DEA based on monitoring of the methanol concentration. They were found to have 1237 ± 56 μg DEA, giving a recovery of 94.8%. Next, twelve samples at each of two levels were generated for storage studies. All samples were collected at 0.75 L/min and stored at room temperature (20 °C) . Finally, six samples including backup impingers were generated for breakthrough studies. ”

“ When wood is placed in an air-tight retort and heated, a number of compounds are evolved, the most important of which are the three liquids, methyl alcohol, acetic acid, and acetone. Methyl alcohol is obtained entirely from this source, and on this account is commonly called wood alcohol. It is a colorless liquid which has a density of 0.79 and boils at 67°. It burns with an almost colorless flame and is sometimes used for heating purposes, in place of the more expensive ethyl alcohol. ”

“ The substitution of one atom of oxygen for two atoms of hydrogen is equally common with hydrogen compounds. By this means alcoholic liquids containing ethyl alcohol, or spirits of wine, C2H5 (OH) , are oxidised until they become vinegar, or acetic acid, C2H3O (OH) . In the same way caustic ammonia, or the combination of ammonia with water, NH3,H2O, or NH4 (OH) , which contains a great deal of hydrogen, by oxidation exchanges four atoms of hydrogen for two atoms of oxygen, and becomes converted into nitric acid, NO2 (OH) . ”

“ In chloroform, again, we have a hydrocarbon radical playing nearly the same part as the radical methyl of methylic alcohol, but with chlorine interposing to modify the simple narcotic action of the radical, and greatly to increase the danger of the compound in its effect on the living body. Physiological research has not yet reached, by vital analysis of action, a perfection of knowledge on the subject now in hand. Such analysis is yet in its early days. At the same time a general line of research has been made out, and some results have been obtained which are of direct practical value. ”

“ The substance is first exhausted by petroleum ether, which frees it from fat; after drying, it is extracted with 85 per cent. alcohol at a temperature not exceeding 40°. The alcoholic extracts are then united, the alcohol distilled off, and the residue filtered. The filtrate is now first purified by agitation with petroleum ether, then saturated by ammonia, and shaken up with chloroform. The latter, on evaporation, leaves the alkaloid only slightly impure, and, after washing with distilled water, [384] if dissolved in dilute sulphuric acid, a crystalline sulphate may be readily obtained. ”

“ In the rectification of this first crude product, the distillate is reserved as rectified ether as long as its specific gravity marks 54° Beaumé, or there about. By continuing the process the product is found to consist of ether, alcohol and water, impregnated with oil of wine. Every one who has made ether, knows how very liable the product is to vary with an ill regulated heat; on the one hand unaltered alcohol will pass over, if the temperature is too low, whilst too great a heat, especially towards the last of the process, will favor the formation of oil of wine and sulphurous acid. ”

“ The use of de-natured alcohol as a fuel has yet to be fully developed. Although alcohol has only about half the heating power of kerosene or gasoline, gallon for gallon, yet it has many valuable properties which may enable it to compete successfully in spite of its lower fuel value. In the first place it is very much safer. Alcohol has a tendency to simply heat the surrounding vapors and produce currents of hot gases which are not usually brought to high enough temperature to inflame articles at a distance. ”

“ Chemical Composition. Volatile oil, resin, mucilage, extractive, iron, and small portions of the carbonate of potass, lime and ammonia. It contains also, according to the analysis of Laugier, a small quantity of Benzoic acid. The Canadian variety is also stated by Laugier to contain benzoic acid both free and combined. Solubility. Its active matter is dissolved by alcohol, proof spirit, and partially by water; the tincture made with alcohol is the least nauseous, and the most efficacious; the spirit of ammonia is also an excellent menstruum, and in many cases improves its virtues. ”

“ The wood spirit, benzine and pyridine bases, with which the denaturing is to be done, must be 'approved.' "The methyl alcohol submitted must be partially purified wood alcohol obtained by the destructive distillation of wood." "It must contain not more than 25 or less than 15 grams per 100 c.c. of acetone and other substances estimated as acetone.". . ." The benzine submitted for approval must be a hydrocarbon product derived either from petroleum or coal tar." ”

“ The most volatile portions of the petroleum are separated by distillation, until the thermometer shows 200° C. These portions are separated, as they exert great solvent action upon paraffine. At the same time he finds that no pyro-paraffine is formed under this temperature. A weighed portion of the residue is taken and mixed with ten parts by weight of amyl alcohol and ten parts of seventy-five per cent. ethyl alcohol: the mixture is then chilled for twelve hours to 0° C. It is then filtered cold, washed first with a mixture of amyl and ethyl alcohols, and then with ethyl alcohol alone. ”

“ The point of interest is not the degree of variation present, but the relatively slight toxicity of methyl alcohol when compared with ethyl alcohol. We shall see that the same is true when we study this as measured by another toxic limit.
For the entire series of primary alcohols which we have considered—methyl, ethyl and the higher alcohols—the following table summarizes the experimental toxic equivalent and its relation to molecular weight and boiling point.
Such are the results when death is produced while the experiment is in progress. ”

“ The action of methyl, ethyl, and n-propyl alcohols on diazo compounds has been well studied by the above authors, and it has been shown that the first two at ordinary pressures give the alkoxy reaction either in whole or in part; n-propyl alcohol gives the hydrogen reaction only. Also the first two give the hydrogen reaction in the presence of zinc dust or sodium carbonate, but in these cases form salts of the acid. On account of its rarity n-propyl alcohol was not used, but n-butyl alcohol which is available in large quantities and in a pure condition was employed. ”

“ The spiritus ammoniæ aromaticus is made without the spirit, the aromatic oils being emulsionized by means of rubbing up with fine sand, but most of these subsequently rise to the surface. The spiritus etheris nitrosi is impossible without alcohol, but nitrite of amyl, and nitrites of potash or soda can be substituted. The spiritus chloroformi is replaced by aqua chloroformi, or as a sweetening agent by solution of saccharin. Thus a favorite expectorant mixture contains carbonate of ammonia five grains, acetum ipecac, ten minims, and solution of saccharin in each dose. ”

“ Alcohol does not ignite so easily as gasoline and the fire is more readily put out, for water thrown upon blazing alcohol dilutes it and puts out the flame while gasoline floats on water and the fire is spread by it. It is possible to increase the inflammability of alcohol by mixing with it some hydrocarbon such as gasoline, benzene or acetylene. In the Taylor-White process the vapor from low-grade alcohol containing 17 per cent. water is passed over calcium carbide. This takes out the water and adds acetylene gas, making a suitable mixture for an internal combustion engine. ”

“ Its compound with calcium chloride has the formula CaCl2·4CH3·OH, and with barium oxide BaO·2CH3OH. Oxidation gives formaldehyde, formic acid and carbonic acid; chlorine and bromine react, but less readily than with ethyl alcohol. The chief industrial applications are for making denatured alcohol (q.v.) , and as a solvent, e.g. in varnish manufacture; it is also used for a fuel; a purer product is extensively used in the colour and fine chemical industries.
Methyl chloride CH3Cl, is a gas, boiling at −23°, obtained by chlorinating methane, or better, from methyl alcohol ”