Glassware storage

Chemical and glassware storage, dish washing, sample refrigerators, glassware dryers, autoclaves for the preparation of sterile sample bottles for the plant, computer(s) for assay calculations, water baths, fume hoods, etc., are additional basic equipment items needed. Typical overall space requirements are 450 ft of floor space per working chemical technician. 

Many modern dishwashers have a container for Jet-Dry cleaning liquid. The use of Jet-Dry eliminates unsightly water stains from clear glassware. This liquid or its equivalent is typically filled once a month or whenever the storage container is empty. The traditional approach to monitor the level of Jet-Dry liquid was to use a little window that showed the liquid level. This, however, was not a very precise indicator of the true level of the liquid left in the container. 

Storage of large volumes of solutions, instability of some reagent solutions, need for scrupulously clean glassware. 

The terms defined above are perhaps illustrated by using the example of the simple assay which we have mentioned before. The assay in Box 1.3 is laid out in the style of a SOP. This particular section of the operating procedure describes the assay itself but there would also be other sections in the procedure dealing with safety issues, the preparation and storage of the solutions used for extraction and dilution, the glassware required and a specification of the instrumentation to be used. 

Materials. Since the oxidation of thiols is strongly catalyzed by traces of metal ions, all experimental techniques were designed to prevent the introduction of extraneous metallic impurities. Preparation and storage of reagents were completed in acid-washed, steam-cleaned glassware. Deionized water was used to prepare all solutions. 

III. ELECTROCHEMICAL GLASSWARE FOR THE VACUUM LINE A. Solvent Storage Containers... 

In addition, the reliability of the stripping data strongly depends on the degree to which contamination can be minimized. Hence, as in other trace analytical methods, all principles of good laboratory practice (glassware cleanliness, sample collection and storage, etc.) must be observed to obtain high accuracy and low detection limits. 

Hydrolytic cleavage of nitro groups, among other reactions, occurs upon exposure of TNT to bases (see The Action of Bases below), but TNT, unlike Tetryl or RDX, does not undergo hydrolysis during storage of a satd soln in sea water over a period of several months at 25° in actinic glassware (Ref 66)... 

Glassware or utensils that have been used for laboratory operations should never be used to prepare food or beverages. Laboratory refrigerators, ice chests, and cold rooms should not be used for food storage separate equipment should be dedicated and prominently labeled for that use. 

Careful handling and storage procedures should be used to avoid damaging glassware. Damaged items should be discarded or repaired by an experienced glassblower. 

When putting items away for storage, the apparatus should be cleaned of all grease and then thoroughly cleaned so that all items are ready for use at all times. Glassware should never be stored dirty with the intent to clean a piece before use. In addition, dried grease and dirt often cause stopcocks and joints to stick. Finally, apparatus should be stored with all pieces assembled (note precautions in Sec. 3.3.2 and Sec. 3.3.3). 

Fig. 3.31 Proper storage of apparatus will not only protect the joints, but will also protect any internal glassware that could otherwise be broken.

Use. It is important to wear gloves and safety glasses and to work in a fume hood If you do not have all of these items for safe use of HF, do not use HF as a cleaning material Pour the diluted HF from its plastic storage container into a plastic soaking tank (like a polypropylene beaker). Let the glassware soak in the HF for anywhere from 30 seconds to two minutes. Rinse for at least one minute (or five full flushes) with water. Then rinse with distilled or deionized water. The HF can be reused many times until a decrease in effectiveness is obvious. 

Drying Ovens. These units are used to facilitate the drying and storage of glassware that needs to be dry and ready at a moment s notice. Drying ovens are also used to dry samples for weighing. 

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