[Pollutants in biological fluids]. / Contaminanti nei fluidi biologici.

The AA. report the gaschromatographic determination of some metal hazards encountered in the environment, as berylliu, chromium, manganese, cobalt, nickel, tin, lead, mercury and others. They develop the rapid method by Hansen et al. for the analysis of sub-nanogram amounts of chromium with the formation from blood of chromium trifluoroacetylacetonate Cr(tfa)3 and quantitation of this chelate using electron-capture GLC. Particularly different samples of chrome tanning workers blood are tested. Informations are provided concerning the equipment, operating parameters, sensitivity, interferences and the approximate time required for this method and the correspondent using the atomic absorption spectrometry.

[Technics for the measurement and evaluation of industrial noise]. / Tecniche di rilevamento e valutazione del rumore industriale.

In the present report a method for the practical noise measurement in the factory environment is developed. The acoustic noise present is normally composed of the noise emitted from several machines more or less simultaneously and the measurement problem often consists in determining an average noise level that is then compared with some accepted noise criteria and on the basis of this comparison decisions may be taken as to necessary changes in the environment. The method extends the dynamic referred to as "impulse" use, that is a characteristic meter response which closely approaches the rise time of the human ear and stores, averages and forgets the short duration signal in a way similar to that of the human brain. The measured average noise level gives a better explanation of the audiometrically detectable occupation noise-induced hearing loss.

[Analytical method to identify and quantitate residues of aromatic polychlorinated hydrocarbons (author's transl)]. / Identificazione e quantificazione dei residui di idrocarburi clorurati aromatici nell'ambiente

A analytical method to identify and quantitate residues of polychlorinated biphenyls, polychlorinated terphenyls, polychorinated naphtalenes and some chlorinated pesticides is described. These contaminants can be recovered from foods or other materials: a silicic acid coloumn chromatografic method previously developed is used to separate PCB's, PCT's, PCN's from organochlorinated pesticide residues. The PCB's, PCT's, PCN's residues identification and their subsequent quantitation can be achieved by conversion into well defined single perchloro-derivatives, viz decachlorobiphenyl, o.m.p. tetradecachloroterphenils and octachloronaftalene, detactable by GLC-EC. The reagnet of exhaustive chlorination of PCB's and PCT's residues is SbCl5, while the reagent used for the exhaustive chlorination of PCN's residues is SO2Cl2 with powdered anhydrous AlCl3 as a catalyst. The identity of perchloroderivatives obtained by chlorination of PCB's, PCT's, PCN's standard mixtures is confirmed on comparing their infrared spectra with the spectra of high purity standards.