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A more efflcleint and tlme-savlng synthetic route to sllicalmmoblllzed 8-quinolinol has been developed that results In a product exhibltlng a relatively large exchange capacity. A comparison of dlfferent sllica supports has been performed and the resulting slllca-bound 8-qulnolinol materlals have been characterized with regard to exchange capaclty, carbon content, acid-base properties, and stablllty. The dependence of capaclty on surface area and pore size Is dlscussed and a comparison i o conventionally prepared silica-lmmoblllzed 8-qulnolinols is made. A posslble explanatlon of apparent discrepancies in the heterogeneous acid dissoclatlon constants of slllca-immoblllzed 8-qulnollnol Is also proposed.

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Carbon dioxide significantly enhances the chemiluminescence of 5-amino-2,3-dihydrophthalazine-1,4-dione (luminol) in the absence of added oxidant. The effect in presence of a variety of rate modifiers (e.g., metal ions and some metal ion complexes) is described in detail. A postulation of the species responsible for enhancement, the role of dissolved oxygen, the influence of the form in which the rate modifier is present and a possible mechanism to explain the enhancement by C02 (g), are also presented. The potential analytical applications of this effect are mentioned and illustrated with the analytical figures of merit for the chemiluminescence determination of Col* in the 5 x 10-13-10-7 moll-1 range.

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