Filter adjustment

Note. Prepare the precipitating reagent by dissolving 5.0 g aluminium potassium sulphate (potash alum) in 90 mL warm water. Cool and add dropwise with stirring, while cooling in ice, a solution of 2.0 g sodium hydroxide in 5.0 mL water until the initially formed precipitate re-dissolves. After standing for 12 hours, filter, adjust the pH to 12.6, and dilute to 100 mL with water. 

Procedure Add 0.1 g of diatomaceous earth to a 60-g sample, agitate for 2.5 min at room temperature (or 10° to 15° above the melting point if the sample is not liquid), and filter. Adjust the temperature to 25° to 35° (or not more than 100 above the melting point), and fill the color tube to the desired mark. Place the tube in the tintometer (in a dark booth or cabinet), and match the sample color as closely as possible with a standard glass. 

Polariscope An instrument used to test the reaction of a specimen to light passed through two polarising filters, adjusted to block out all light, with the specimen placed between them. 

Filter, adjust pH to 5 with acetic acid (HOAc), dialyze, and concentrate Na2COs-(cold)-soluble... 

Sample preparation Condition a 200 mg Oasis HLB SPE cartridge with 3 mL MeCN and two 2 mL portions of water. Dissolve 7.5 g honey in 15 mL 2 M HCl, let stand at room temperature for 30 min, add 30 mL 300 mM citric acid, mix, filter. Adjust the pH of a 20 mL aliquot of the filtrate to 3.5-4.5 with 25% ammonia, immediately add to the SPE cartridge and pass through within 10-15 min, wash with three 3 mL portions of water, let dry for 4 min, elute with 3 mL MeCN. Evaporate the eluate to a small volume under reduced pressure at 40°, add 500 ixL mobile phase, vortex, inject a 10 irL aliquot. 

To 90 ml of a suitable concentration of mercury in neutral or acetic acid solution add 5 0 ml of N nitric acid from a pipette, mix thoroughly, add 3 0 ml of /)-dimethylaminobenzylidine-rhodanine reagent (0 04 g shaken with 200 ml of ethanol, left overnight and filtered), adjust the volume to 100 ml and mix. Compare with standards prepared by adding suitable known amounts of standard mercuric nitrate solution (0-5 g mercury in 5 ml of concentrated nitric acid, dilute, boil to remove nitrous fumes and dilute to 250 ml make further dilutions so that 1 ml 0 0001 g Hg) to similar amounts of nitric acid and reagents as used in the test solution. Develop the colour in both test solution and standards simultaneously, allow to stand for five minutes and compare. 

Enzyme-hydrolysed casein. Suspend 120 g of casein in 2 litres of a 0-8 per cent sodium bicarbonate solution, previously adjusted to pH 8 0. Add a suspension of 10 g of pancreatin and shake. Add a few drops of toluene and incubate for about fifty-six hours at 37°. Heat in flowing steam for thirty minutes, cool, adjust to pH 6 0 with glacial acetic acid (about 28 ml is usually required) and filter. A filter aid, such as supercel, may be used. Add 60 g of activated charcoal, stir for thirty minutes and filter. Adjust to pH 3-8 with hydrochloric acid, add 24 g of activated charcoal, stir for thirty minutes, and filter. Finally, adjust the volume to 2-4 litres with water. 

Many other proposals have been made to recover lithium from various sources, such as small lithium batteries. For instance, Tanaka and Shimamune, 2003 suggest dissolving the electrode materials, filtering, adjusting the pH to 7-10 to precipitate cobalt, and then recovering lithium. Alternately they propose electro-depositing the... 

When the solvent around the spot has evaporated, the plate is placed ertically in a glass developing tank (a cylinder for small slides) which contains a small quantity of the solvent and is lined with filter-paper dipping into the solvent the level of the latter is adjusted, preferably with a pipette, so that the lower edge of the absorbent layer is under the soh ent but the spot is above this level, and the top of the cylinder is then firmly closed. The solvent rises through the adsorbent layer, and the components of the mixture ascend at different rates depending on their affinities for the adsorbent. 

Now fit the weighed funnel G again to the filter-flask, and attach the Pregl filter-tube K as shown (Fig. 21). Apply 2i gentle suction from the water-pump, and dip the open limb of the tube K just below the surface of the liquid in the Carius tube. Draw off the supernatant liquid a little at a time until rather less than 1 ml. remains. Now gently shake the mixture in the Carius tube, and try to adjust the suction so... 

Place 125 ml. of concentrated ammonia solution (sp. gr. 0-88) in a 600 ml. beaker and surround the latter with crushed ice. Stir the ammonia solution mechanically, and introduce the n-caproyl chloride slowly by means of a suitably supported separatory funnel with bent stem. The rate of addition must be adjusted so that no white fumes are lost. The amide separates immediately. Allow to stand in the ice water for 15 minutes after all the acid chloride has been introduced. Filter oflF the amide at the pump use the flltrate to assist the transfer of any amide remaining in the beaker to the Alter (2). Spread the amide on sheets of Alter or drying paper to dry in the air. The crude n-capro-amide (30 g.) has m.p. 98-99° and is sufficiently pure for conversion into the nitrile (Section 111,112) (3). Recrystallise a small quantity of the amide by dissolving it in the minimum volume of hot water and allowing the solution to cool dry on filter paper in the air. Pure n-caproamide has m.p. 100°. 

Method 2. The procedure described under Benzenesulphonyl Chloride, Method 2 (Section IV,206) may be used with suitable adjustment for the difierence in molecular weights between sodium p-toluenesulphonate (Section IV,30) and sodium benzenesulphonate. When the reaction product is poured on to ice, the p-toluenesulphonyl chloride separates as a sohd. This is filtered with suction it may be recrystaUised from hght petroleum (b.p. 40-60°) and then melts at 69°. 

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