Glove-box

It is reported that mild carbon steels may be effectively protected by as little as 55 ppm of KTc04 in aerated distilled water at temperatures up to 250oC. This corrosion protection is limited to closed systems, since technetium is radioative and must be confined. 9sTc has a specific activity of 6.2 X lOs Bq/g. Activity of this level must not be allowed to spread. 99Tc is a contamination hazard and should be handled in a glove box. 

Plutonium solutions that have a low activity (<3.7 x 10 Bq (1 mCi) or 10 mg of Pu) and that do not produce aerosols can be handled safely by a trained radiochemist in a laboratory fume hood with face velocity 125—150 linear feet per minute (38—45 m/min). Larger amounts of solutions, solutions that may produce aerosols, and plutonium compounds that are not air-sensitive are handled in glove boxes that ate maintained at a slight negative pressure, ca 0.1 kPa (0.001 atm, more precisely measured as 1.0—1.2 cm (0.35—0.50 in.) differential pressure on a water column) with respect to the surrounding laboratory pressure (176,179—181). This air is exhausted through high efficiency particulate (HEPA) filters. 

In the laboratory, sodium is best handled in a glove box filled with nitrogen or another inert gas, or in a water-free hood. When sodium is handled on the bench top, water and aqueous solutions must be excluded from the area. Tools for cutting or handling sodium must be clean and dry. Contact of sodium with air should be kept to a minimum because moisture in the air reacts rapidly with sodium. A metal catch pan under the equipment is essential to... 

Syringe techniques have been developed for small volumes, while for large volumes or where much manipulation is required, dryboxes (glove boxes) or dry chambers should be used. 

Calcium [7440-70-2] M 40.1, m 845 . Cleaned by washing with ether to remove adhering paraffin, filed in an argon-filled glove box, and washed with ethanol containing 2% of cone HCl. Then washed with dry ethanol, dried in a vac and stored under pure argon [Addison, Coldrey and Halstead, J Chem Soc 3868 1962],... 

Sodium sulfite [7757-83-7] M 126.0, d 2.63. Crystd from warm water (0.5mL/g) by cooling to 0°. Purified by repeated crystns from deoxygenated water inside a glove-box, finally drying under vacuum. [Rhee and Dasgupta J Phys Chem 89 1799 1985.]... 

Lithium/carbon cells are typically made as coin cells. The lithium/carbon coin cell consists of several parts, including electrodes, separator, electrolyte and cell hardware. To construct a coin cell, we first must prepare each part separately. Successful cells will lead to meaningful results. The lithium/carbon coin cells used metallic lithium foil as the anode and a carbonaceous material as the cathode. The metallic lithium foil, with a thickness of 125 pm, was provided by Moli Energy (1990) Ltd.. Idie lithium foil is stored in a glove-box under an argon atmosphere to avoid oxidation. 

The electrolyte used is 1 molar LiPF dissolved in a mixture of 30% ethyl carbonate (EC) and 70% diethyl carbonate (DEC) by volume. This electrolyte IS easy to use because it will self-wet the separator and eleetrodes at atmospheric pressure. The electrolyte is kept under an argon atmosphere in the glove-box. The moleeules of electrolyte solvents, like EC and DEC, have in-plane dimensions of about (4 A x 5 A) to (6 A x 7 A). These molecules are normally larger than the openings of the micropores formed in the region 3 carbons (Fig. 2) as described in section 5. 

Electrochemical cells are assembled in the glove-box. The cell is a 2320-type coin cell (23 mm OD and 2.0 mm thickness) as schematically shown in Fig. 5. The cell includes the electrolyte, the cell cap and can which are stainless steel, a polypropylene gasket used to seal the cell, the two electrodes, the separator between the electrodes, as well as a stainless spacer and a mild steel disc spring which are used to increase the pressure on the electrodes. Once the cell is assembled in the right order, the cell is sealed by a pressure crimper inside the glove-box. 

When glove boxes are used for abrasive blasting, their design must take into account that the ejector of the abrasive material is driven by compressed air. This influences the chosen flow rate, which should be large enough to generate an air velocity of at least 3 m s" in the openings. The necessary exhaust airflow rate recommended by INRS is then... 

The ACGIH - recommends 20 air changes per minute for a glove box for abrasive blasting. With a volume of 1 m this is equal to 0.33 s k They also recommend an inward air velocity at all openings of at least 2.5 m s"F... 

A Class I BSC fitted with an added panel covering the opening and fitted with arm-length gloves, becomes, in many ways, similar to a glove box de-... 

Glove boxes have been described in Section 10.2.3.6 as systems with only exhaust air. There are glove boxes with both supply and exhaust air openings inside the closed volume (see Section 10.4.6.4) that look and function like the boxes described earlier. The use of supply air directly to the closed volume means that the control of the flow rates must be very accurate. Otherwise the box may be at a higher pressure than the surrounding areas, resulting in leakage of contaminants. 

Glove box A sealed enclosure used for handling toxic products by means of long impervious gloves sealed to form part of the enclosure. 

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