Storage of solvents

The legislative requirements for correct storage of hazardous materials are dependent on the type of container, quantity and flash point of the material stored. 

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Solvent storage CCR Title 23, Chapter 3, Subchapter 16 Addresses underground storage of solvents. 

Storage of solvent extracts or sorption tubes with analytes trapped, in freezer in glass vials closed with PTFE stoppers 1 month 115,116... 

Store your chemicals in clearly labelled containers, and abide by the regulations concerning storage of solvents and other hazardous materials. Dispose of waste chemicals safely, according to the approved procedures for your laboratory. Never pour organic compounds down the sink. 

TABLE 1-16 Maximum Allowable Size of Containers foi Storage of Solvents Inside Buildings (OSHA)... 

Storage of solvents is uimecessary if they are used in a TLC chamber immediately after they have been prepared. However, it is sometimes stated in the literature that certain solvent systems can be stored for several months [50]. In this case, the best advice is to store them in a dark bottle in a cool place. The daily quota of a solvent system should also be kept cool in the summer, e.g. if laboratory temperatures exceed 25 °C. Care must be taken to adjust the temperature to room temperature before the development. 

The solvents in the as-supplied alkyd resin solutions and in the paint composition represent a potential hazard due to their (eco)toxicological effects and flammability. Manufacturers and suppliers of resin solutions and paints must indicate the potential dangers involved in the handling, transportation, and storage of solvents by labeling drums and containers according to national and international regulations. 

In most industrialized countries regulations exist governing the storage, in bulk or in drums, of highly flammable liquids. The storage of solvents which are not flammable (e.g. most chlorinated hydrocarbons) or which have a flash point above normal ambient temperature (e.g. DMF) are imHkely to be regulated imless they pose a very serious environmental hazard. 

The storage of solvents with flash point less than 55°C... 

The storage of solvents in bulk is a very common practice and is ideal for users requiring large volumes of material. However, the use of solvents from drums is also widespread and subject to strict legislation. 

As indicated at the beginning of this section the storage of solvents not classified as flammable or which are non-flammable is not subject to regulation. Recommendations based on good operating practice should be followed. 

The system is a floor-standing instrument that includes a vented cabinet for storage of solvents and reagents. Six solvent/reagent reservoirs are available typically for DMF or NMP as a main wash solvent, piperidine-DMF (1 4) for deprotection, DCM as a secondary reagent, HBTU solution for activation, acetic anhydride as a capping solution, and a TFA-based cleavage cocktail. 

Global suppliers of vacuum enclosed vapor degreasers number as of 2013 number about one-half dozen. The machines (apparatus) of each supplier manage the contact between parts and solvent, and the storage of solvent(s), in ways which are similar and only slighdy different. 

For most of the experiments related to this chapter devoted to the reduction of platinum, the experimental conditions are based on obtaining the so-called superdry conditions described by Hammerich and Parker [35] and Heinze [36]. These conditions were additionally redefined in previous reports [37-39]. Even though most of the experiments described in this chapter have been performed in dimethylformamide (DME), it should be emphasized that acetonitrile (AN) or propylene carbonate (PC) could be used as well. An important and essential condition is the use of extremely dry solvents. A simple method for obtaining dry solvents (with less than 50 ppm of water traces) consists in the direct in situ addition of activated neutral alumina in the electrochemical cell. Eor this, the activation of alumina is achieved by heating at 300°C for 4 h under vacuum. In particular, DME was almost constantly checked (by the Karl Eischer method) to ascertain that it contained less than 50 ppm of water. A permanent storage of solvent over alumina gave best results. 

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