Under water weight

It is very poisonous, 50 mg constituting an approximate fatal dose. Exposure to white phosphorus should not exceed 0.1 mg/ms (8-hour time-weighted average - 40-hour work week). White phosphorus should be kept under water, as it is dangerously reactive in air, and it should be handled with forceps, as contact with the skin may cause severe burns. 

In the case of thickeners, the process of compaction of the flocculated material is important. The floes settle to the bottom and gradually coalesce under the weight of the material on top of them. As the bed of flocculated material compacts, water is released. Usually the bed is slowly stirred with a rotating rake to release trapped water. The concentrated slurry, called the underflow, is pumped out the bottom. Compaction can often be promoted by mixing coarse material with the substrate because it creates channels for the upward flow of water as it falls through the bed of flocculated material. The amount of compaction is critical in terms of calculating the size of the thickener needed for a particular operation. The process of compaction has been extensively reviewed in the Hterature (41,42). 

Atmospheric pressure decreases by approximately 1.0 psi for every 2343 feet of elevation. Elevations below sea level, such as in excavations and depressions, atmospheric pressure increases. Pressures under water differ from those under air only because the weight of the water must be added to the pressure of the air. 

Glass fibre reinforced enamels BS 4147 BS 4164 BS SI4 AWWA/ANSI C203 Hot applied in factory and in field by line travel 2-5-6 Asphalts prone to water absorption and root damage. Coal tar resistant to oil products and root damage. Long successful service record, particularly coal tars. Proven under concrete weight coatings. 

HMTD is very unstable in storage. Its weight loss is 79% in 300 days at 50°, 150 days at 70° and 5 to 20 days at 90°, for material stored dry. Even under water it showed considerable decomp in 4 months (Ref 16)... 

The XAD-4 quaternary resin was cleaned by Soxhlet extraction and kept wet under water to minimize artifacts from the resin. An oily, yellow residue observed during concentration of the acidic eluants required an additional cleanup step. On the basis of the results of the resin blank experiments, it was necessary to clean the XAD-4 quaternary resin by batch process with saturated HCl/methanol prior to Soxhlet cleaning with solvents. Artifacts such as benzoic acid were found in the resin blank experiments, but, in general, the mass of each artifact (per dry weight of resin) was negligible. 

Make up the substrate solution1 for each 10 mL of substrate buffer, add 40 pL of NBT stock and 40 pL of BCIP stock, in that order, mixing between additions. Add the substrate solution to the blot, and allow color development to proceed Stop the reaction by washing several times with water Dry the blot between sheets of Whatman 3MM paper under a weight. 

Preparation of Tetryl. Twenty grams of dimethylaniline is dissolved in 240 grams of concentrated sulfuric acid (d. 1.84), the temperature being kept below 25°, and the solution is allowed to run from a separatory funnel drop by drop into 160 grams of 80 per cent nitric acid (d. 1.46), previously warmed to 55° or 60°, while this is stirred continuously and kept at a temperature between 65° and 70°. The addition requires about an hour. After all has been added, the stirring is continued while the temperature of the mixture is maintained at 65° to 70°. The material is allowed to cool the solid matter is collected on an asbestos filter, washed with water, and boiled for an hour with 240 cc. of water while further water is added from time to time to replace that which boils away. The crude tetryl is filtered off, ground under water to pass a 150-mesh sieve, and boiled twice for 4 hours each time with 12 times its weight of water. The solid is dried and treated with benzene sufficient to dissolve all readily soluble material. The solution is filtered and allowed to evaporate spontaneously, and the residue is recrystal-... 

Water Transfer about 50 mL of liquid sulfur dioxide into a Karl Fischer titration jar, determine the weight of sample taken, and determine the water content as directed in the Karl Fischer Titrimetric Method under Water Determination, Appendix IIB. 

Trehalose Standard Preparation Determine the water content of a Trehalose standard (available from Hayashibara International, Inc., Suite 200,8670 Wolff Court, Westminster, CO 80031-6953) as directed under Water Determination, Appendix IIB. Use the calculated dry weight as the value for 100% pure Trehalose. Prepare the Trehalose Standard Solution by dissolving 1 g of anhydrous Trehalose in sufficient water to bring the volume to 25 mL. 

The ring-and-ball softening point is the temperature at which a disk of the sample held within a horizontal ring is forced downward a distance of 25.4 mm under the weight of a steel ball as the sample is heated at a prescribed rate in a water, glycerin, or silicone oil (Dow Corning 200 fluid 50 cs or an equivalent is suitable) bath. 

---