949 resultados para 2,4,6,8-tetraoxaadamantanes


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Action for a cleaner tomorrow, a South Carolina environmental curriculum supplement has been developed to teach the children of South Carolina and, ultimately, their parents to think about their daily habits and to make environmentally responsible choices. This curriculum supplement tries to reflect the environmental issues facing the world today with a particular emphasis on South Carolina’s concerns and goals. This document deals with grades 6-8.

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Formaldehyde is a toxic component that is present in foundry resins. Its quantification is important to the characterisation of the resin (kind and degradation) as well as for the evaluation of free contaminants present in wastes generated by the foundry industry. The complexity of the matrices considered suggests the need for separative techniques. The method developed for the identification and quantification of formaldehyde in foundry resins is based on the determination of free carbonyl compounds by derivatization with 2,4-dinitrophenylhydrazine (DNPH), being adapted to the considered matrices using liquid chromatography (LC) with UV detection. Formaldehyde determinations in several foundry resins gave precise results. Mean recovery and R.S.D. were, respectively, >95 and 5%. Analyses by the hydroxylamine reference method gave comparable results. Results showed that hydroxylamine reference method is applicable just for a specific kind of resin, while the developed method has good performance for all studied resins.

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[Programme. 1651-05-02 - 05-04. Paris, Palais royal]

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Acquis le 1er avril 1837 de MM. de Bure, "manuscrits provenant de la bibliothèque de Rosny, ou plutôt de M. Lepelletier de Rosambo", pour le prix de 4580 francs; cf. B.n.F., département des Manuscrits, registre des acquisitions 1833-1848, n° 2031; Delisle, Cab. des mss., II, 294; — bibliothèque de Rosny (de Marie-Caroline de Bourbon-Sicile, duchesse de Berry); cf. Catalogue Rosny, n° 2383; — ex-libris gravé aux armes de Louis Le Peletier de Rosambo (f. de garde); — Pierre Pithou, cf. note autographe "Hoc vetustissimum exemplar librorum VI, VII et VIII codicis Theodosiani quo v. c. Jacobus Cujacius in edendo eo libro usus est dono mihi dedit v. c. Franciscus Pithoeus patruus anno MDCXX. Pithou" (1); B.n.F., département des Manuscrits, nouv. acq. fr. 5527, f. 5; — manuscrit personnel de Florus de Lyon