INDEX scavenging

Part II Function/Application Index scavenger, acid... 

Preliminary evidence suggests that certain idiosyncratic reactions to anticonvulsants are mediated by reduced free radical scavenging activity, as indicated by lower selenium concentrations and a higher lipid peroxide index in affected patients (SEDA-19, 62). 

Freezing of waters in the active zone over winter results in the progressive concentration of the residual solution, until first carbonates, then sulfates and chlorides/nitrates precipitate out of solution. These salts can be scavenged by the first waters of the thaw, and these may also become concentrated solutions of chlorides/ nitrates and sulfates in the first instance. Thereafter, both secondary and primary carbonate can be scavenged, since, as Ca concentrations decline, the saturation index of calcium carbonate becomes negative. Hence, groundwaters in proglacial areas may span the spectrum from relatively... 

The main-chain scission yield was recently compared at room and liquid nitrogen temperatures [415] in the presence of a large number of additives known as radical, cation or electron scavengers. The results are given in Table 31. The protection index, in this case defined as 100(7V0 — N)/N where N0 and N are the number of scissions per chain in the absence and in the presence of additive, respectively, is nearly independent of the irradiation temperature marked protection is observed for all the additives studied with the exception of nitrous oxide. It must therefore be concluded that the mechanism of main-chain scission is identical at room and liquid nitrogen temperatures and that ions and radicals are involved in the radiolysis. A detailed study of the effect of ethyl mercaptan on main-chain scission and volatile formation was then undertaken [395]. About 75% protection of main-chain scission was obtained at 313 and at 77°K when the polymer contained 1.49 wt. % of ethyl mercaptan the protection index increases to 90% for concentrations of the order of 10 wt. %. The yield of volatile products was, however, unaltered by the presence of 1.5 wt. % ethyl mercaptan. 

We calculated a chemiluminescent scavenging index - CL-SI (%), as a ratio of CL in the presence and in the absence of the extract at each concentration. 

Figure 3. The hydroxyl radical scaveugiiig activity of uine difiereiit spices all bclongiug to the fkinily Labiatae. The activity was measured by using electron qiin rcsonanee technique, and the indexes were calculated on the basis of top height oni (lata of refertmce (2S). A low value of the index indicates an eCGcient scavenger. Columns with different letters are dgniUcanily different at 5% level.

The older literature is full of experimental estimations of X, also called the washout coefficient, by the measurement of the gas and rainwater concentration of soluble gases. However, that approach is wrong because a) A is a function of height (it should measured as the vertical gas phase concentration profile and not the surface concentration) and b) a dominant part of the dissolved matter arises from in-cloud scavenging. For sub-cloud scavenging, assuming the washout process to be a first-order process (rfc/rft) = Ac, we can describe the sub-cloud process for gases as well as particles indexes g and p denote the gas and particle, respeetively ... 

Chem. Descrip. Dimethylaminoethyl methacrylate CAS 2867-47-2 EINECS/ELINCS 220-688-8 Uses Detergent and sludge dispersant in lubricants vise, index improver flocculant for wastewater treatment retention aid for paper mfg. acid scavenger in PU foams corrosion inhibitor resin and mbber modifler used in acrylic polishes and paints, hair prep, copolymers, sugar clarification, adhesives, water clariflcation, acrylic plastics for food pkg. Regulatory FDA 21CER 177.1010... 

Uses Emulsifier surfactant chemical intermediate raw material for surfactants germicide corrosion inhibitor in process plant streams acid scavenger in petrol prods. epoxy hardener curing catalyst vise, index improver for lubricants flotation collector for sulfide ores inhibitor for butadiene polymerization processing aid for metal and textiles... 

---