U list

The P list and the U list. These two lists are similar in that both list as hazardous pure or commercial grade formulations of certain specific unused chemicals. 

To indicate its reason for listing a waste, U.S. EPA assigns a hazard code to each waste listed on the F, K, P, and U lists. These hazard codes are listed below. The last four hazard codes apply to wastes that have been listed because they typically exhibit one of the four regulatory characteristics of hazardous waste. There will be more about the four characteristics of hazardous waste later in this chapter. The hazard codes indicating the basis for listing a waste are as follows2 3 4 5 6 7 ... 

The P and U lists designate as hazardous pure or commercial-grade formulations of certain unused chemicals. The P and U listings are quite different from the F and K listings. For a waste to qualify as P- or U-listed, a waste must meet the following three criteria ... 

The waste must contain one of the chemicals listed on the P or U list. 

The generic P and U list waste description involves two key factors. First, a P or U listing applies only if one of the listed chemicals is discarded unused. In other words, the P and U lists do not apply to manufacturing process wastes, as do the F and K lists. The P and U listings apply to unused chemicals that become wastes. Unused chemicals become wastes for a number of reasons. For example, some unused chemicals are spilled by accident. Others are intentionally discarded because they are off-specification and cannot serve the purpose for which they were originally produced. 

There are four lists of hazardous wastes in the regulations wastes from nonspecific sources (F list), wastes from specific sources (K list), acutely toxic wastes (P list), and toxic wastes (U list) there are also the four characteristics mentioned before ignitability, corrosivity, reactivity, and extraction procedure toxicity. Certain waste materials are excluded from regulation under the RCRA. The various definitions and situations that allow waste to be exempted can be confusing and difficult to interpret. One such case is the interpretation of the mixture and derived-from rules. According to the mixture rule, mixtures of solid waste and listed hazardous wastes are, by definition, considered hazardous. Similarly, the derived-from rule defines solid waste resulting from the management of hazardous waste to be hazardous (40 CFR 261.3a and 40 CFR 261.1c). 

Appendix-U List of Banned Drugs and Fixed Dose Combinations in India... 

Waste is classified as hazardous by listing if it contains any amount of specified materials from nonspecific sources (the so-called F list), specified materials from specific sources (the K list), or specified chemicals from any source (the P and U lists). 

In addition to chemical waste that may be classified as hazardous based on one or more of the characteristics described above, a chemical waste may be classified as hazardous if it is specifically listed (EPA, 1980b). Chemical wastes are listed based on their source or the presence of specific hazardous substances. Listed hazardous wastes include wastes from nonspecific sources (the so-called F list), wastes from specific sources ( K list), acutely toxic hazardous waste from any source ( P list), and toxic (other than acute) waste from any source ( U list). 

Any chemical experiment involves the reaction of enormous numbers of atoms or molecules. The term mole is used to indicate a collection of a large, fixed number of fundamental chemical entities, comparable to the quantity that might be involved in an actual experiment. In fact, the mole is recognized in SI as the unit for one of the dimensionally independent quantities, the amount of substance. The abbreviation for the unit is mol. A mole of atoms of any element is defined as that amount of substance containing the same number of atoms as there are carbon atoms in exactly 12g of pure 12C. This number is called Avogadro s number or Avogadro s constant, Na. The value of this quantity may be related to the value of the u, listed in Table 2-1, as follows ... 

Piok T, Romaner L, Gadermaier C, Wenzl FP, Patil S, Montenegro R, Landfester K, Lanzani G, CeruUo G, Scherf U, List EJW (2003) Synthetic Met 139 609... 

U-List - Toxic and other commercial products (40 CFR 261.33[f]). Both the P-List and the U-List contain several commercial pesticides. 

Ha ira yS U listed everyq Sf" j1 ifSM incl iln5 anyi rant- J avyairdmi bodies P... 

Zojer E, Pogantsch A, Hennebicq E, Beljonne D, Bredas JL, de Freitas PS, Scherf U, List EJW (2002) Green emission from poly(fluorene)s The role of oxidation. J Chem Phys 117(14) 6794-6802... 

Scherf U, List EJW (2002) Semiconducting polyfluorenes - Towards reliable structure-property relationships. Advanced Materials 14(7) 477-487... 

Calculated by using only 80X of the U listed for the halogen this halogen is not really attached to a C atom with a double bond but this idea was used in the calculation. 

U-List (see 40 CFR Part 261.33(f), Discarded Commercial Chemical Products, Off-specification Species, Container Residues and Spill Residues Thereof)... 

Reaction List. A list of numerical characteristics of the strand of carbons in a reaction or half-reaction, as substrate or product /-list of functionalities (/-values) u-list of skeletal levels (ff-values). 

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