Comments on the Preferred Method

Chemical shifts in the H NMR spectra of lignin acetates in chloroform solutions are relatively insensitive to sample concentration and are only slightly affected by moderate temperature changes. According to model compound studies, changes in chemical shifts are at most 0.01 S unit when the temperature is varied in the range 295- 305 K. 

The peaks in the spectra shown in Figs 5 3 1 and 5 3 2 are very broad, as is typically found for the H NMR spectra of lignins Whether this is merely due to chemical shift variation or is also related to the polymeric nature of the sample is a question which deserves further attention 

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Fox [9] commented on the method of selecting the right surfactant to stabilize the emulsions. Mainly, the PILB method is described. Generally, a pair of emulsifiers of high and low HLB (leading to the resulting required HLB) is preferred over a single emulsifier of the required HLB. 

Stairs comments that this p value is strongly dependent on the temperature but his data have been criticised by Duffin and Tucker ", who prefer their method of observing the rate of formation of the adduct to that of estimating total residual oxidising power employed by Stairs, and they find p (25°) to be —2.32+0.10 as compared to a value of —2.20+0.07 at 40 °C. These values are considerably more negative than those found for chromic acid oxidation of diphenylmethanes (— 1.17) and toluenes (-1.12). 

The lUPAC guidance on validation of analytical methods in a single laboratory comments that the limit of determination or limit of quantification is sometimes arbitrarily defined as 10% RSD and sometimes as a multiple of the limit of detection." However, it recommends that instead of specifying a limit of quantification, it is preferable to... 

In the previous seetion devoted to Physieal Models, we have recalled that an important issue of all the solvation methods is their ability to treat nonequilibrium, or dynamical, aspects. There, for elarity s sake, we preferred to skip the analysis of this feature, limiting the exposition to static, or equilibrium problems here, on the eontrary, some comments will be added. 

EPA agrees with those commenters who believe that prior notification for every project is simply too burdensome for the regulated community and for the agency. If the streamlined, telephone-based system recommended by some of the commenters were implemented, it would reduce the initial burden on the renovation firms. However, EPA would still have to process millions of such notifications annually, and the collective bnrden on renovation firms and the government would be considerable. Rather than require millions of notifications annually, the great majority of which would never be reviewed, EPA prefers to nse other methods for targeting renovation projects for inspections. 

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