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By Gould R.F. (ed.)

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The different slopes indicate that selective interactions of the samples with the silica surface also play a n-Ptntont I . iitiis o's i г ;•""«""""• '„о \ - J - - { — J - » not mi*fiW* \ rule. 3 Solvent mixtures of the same eluent strength can be prepared by adding a very small quantity of a strong eluent or a larger quantity of a less polar eluent to a weak eluent such as an aliphatic hvdrocarbon. In Fig. 5, the compositions of eluents having equal eluotropic strength are depicted. 0,5. ,. I 1 3 10 J 3 Pl l' Isopropyl CHoridt - Acitonitrilt sow J—{—2 3 ' .

5%, 6%, and 9% (w/w) water. The reservoir contained 500 ml of hep­ tane and was maintained at 25°C. The analytical column is packed with neutral alumina (Woelm) d, ~ 5 pm. Sample components: 1, tetrachloroethylene; 2, benzene; 3, naphtha­ lene; 4, biphenyl; 5, anthracene; 6, pyrene; 7, fluoranthene; 8, 1,2-benzanthracene. ] Less polar organic compounds such as acetonitrile and tetrahydrofuran have also been used as modulators with nonpolar aNphatic hydro­ carbons as eluent. With decreasing polarity of the additive the concen­ tration of "modulator" in the nonpolar eluent has to be increased in order to obtain similar retention values.

Furthermore, changes in the water content on opening the flask or pouring the eluent into another container are virtually inevitable. Ordinarily water content may be determined by a Karl Fischer titration, but for the low concentrations in aliphatic hydrocarbons this method isfilledwith difficulties. To obtain even modest accuracy such as ± 5 ppm at H1O levels about or below 30 ppm as specified by the German Standard DIN 51777 relatively large eluent volumes (>200 ml) are required. On the other hand, the absolute and relative retentions are sensitive to 1 to 2 ppm of water; consequently, two different batches of eluent with identical water content according to the above mentioned Karl Fischer titration can yield different retention values.

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Addition and Condensation Polymerization Processes by Gould R.F. (ed.)

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