Preparation and storage

Chemical Reactions of Dyes. Decolorization is important for cyanines used ia imaging materials. Understanding decolorization provides clues to dye reactions that may cause degradation of imaging materials duting preparation and storage. For many dyes, protonation of the methine chain occurs readily and reversibly (64). Highly basic carbocyanine dyes like those from benzimidazole (eg, 36) protonate so readily that this provides a practical decolorization method. 

A continuous rubber belt used to transport coal from the coal yard to a fuel preparation and storage area. 

Important points. During preparation and storage of Eluents 1, 3 and 4, make sure that the ratio of the solvent components is correct. 

Luthe, D. S. (1983). A simple technique for the preparation and storage of sucrose gradients. 

Kon M and Shimba R. 1989. Changes in carotenoid composition during preparation and storage of frozen and freeze-dried squash. Nippon Shokuhin Kogyo Gakkaishi 36 619—624. 

Lime, B. J. Preparation and storage studies of freeze-dried avocado salad. Food Technology V. 23, p. 43 16. 1969. Copyright 1969 Institute of Food Technologists, Chicago IL, USA... 

Lanina SY, Strakhova NM, Lappo VG. 1992. Toxicological estimate of polyvinyl chloride containers for preparation and storage of blood, its components, preservatives and infusion solutions. Med Prog Tech 18 19-22. 

Details of preparation and storage conditions for crops that last well through the winter are given here (seepanel, left). Some other crops can also be stored for shorter periods for example, carrots, parsnips, beets, rutabagas, and celeriac keep well if packed in moist sand or fine leaf mold in shallow trays or boxes. 

Oral concentrate - Concentrate may be diluted with distilled or acidified tap water or suitable juices. Dilute each dose just prior to administration preparation and storage of bulk dilutions is not recommended. 

Thiatriazole-5-thiol and its salts are readily obtained from the water-soluble alkali or alkaline earth azides with CS2 at 40 °C <64AHC(3)263>. However, these salts should be handled with extreme care as violent explosions have been reported when the alkali salts are spread on a porous plate or rubbed with a spatula. The slightly soluble heavy-metal salts are very sensitive to shock even under water. An improved method for the preparation and storage of sodium thiatriazole-5-thiolate has been reported. The free acid is obtained by addition of concentrated hydrochloric acid to a chilled solution of the sodium salt but can also be prepared from hydrazoic acid and carbon disulfide (Scheme 38). 

The mixture should be stable during preparation and storage. Materials of low hygroscopicity must be used. 

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. 

Characterization of the stability of chemicals during preparation and storage of the samples is indirect. 

The activated catalyst can be metered by membrane pumps. The reactor must additionally be equipped with tanks for the preparation and storage of the catalyst. Furthermore, devices for injecting catalyst deactivators, such as methanol, may be required after the reactor to terminate the polymerization. 

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