Search Results

You are looking at 1 - 8 of 8 items for

  • Author or Editor: G. Capannesi x
Clear All Modify Search

Abstract  

A method is developed for measuring the current efficiency of an industrial aluminium electrowinning cell of the production plants of ALUMINA — Portovesme, in Sardinia. A mixed tracer (Au+Ag+Ir) was introduced into the cell, and samples of aluminium were periodically withdrawn and analyzed by INAA. The trend of aluminium production rate is studied before and after the casting. Data reliability and future developments are also discussed.

Restricted access

Abstract  

Instrumental neutron activation analysis was employed to measure 43 elements, including some macroconstituents, in the leaves of some species of the epiphytic genusTillandsia (Bromeliaceae). The results, confirming the oligotrophyc nature of the genus, are briefly discussed with regard to a possible role as multielemental environmental monitors.

Restricted access

Abstract  

Evergreen oak was chosen as a possible biological monitor of environmental pollution. It was shown that there is a direct relationship between the concentration of elements in leaves and the presence of pollution sources, i.e. the density of vehicular traffic.

Restricted access

Abstract  

Instrumental neutron activation analysis has been applied to the determination of Fe isotopic abundances in iron materials with the experimental accuracy of 5%. The proposed method can be considered as a quite simple and fast quality check system on the iron isotope enriched oxides used as standard in Mössbauer spectroscopy.

Restricted access

Abstract  

A novel high precision detection method for the determination of the distillation end point of the coking process (usually in the 950–1100°C range) has been developed. The system is based on the use of a metallic capsule that melts at a fixed temperature and releases a radioactive gas tracer (133Xe) in the stream of the distillation gas. A series of tests on a pilot oven confirmed the feasibility of the method on industrial scale. Application of the radioactive tracer method to the staging and monitoring in the coking process appears to be possible.

Restricted access

Abstract  

The element concentrations in potable water samples collected in two different urban areas for the water supply, Rome and Florence, are determined by INAA and compared. The results on drinking water of Rome show that the potentially toxic elements (Sb, Hg, Cr, Ni, etc.) are present at levels below the limit values whereas the essential human elements give a convenient nutritional support. Further, it is also evidenced that the elemental composition is quite similar to that of uncontaminated natural waters. According to the drinking water of Florence the characterization of the concentration of elements show an almost good situation except for Al.

Restricted access

Abstract  

The present paper confirms that evergreen oak leaves (Ouercus ilex) are a reliable biological monitor for pollution originating from vehicular traffic. By treating of experimental data statistically a simple model was obtained which explains pollution levels in terms of vehicular density and particulate resuspension effects. An extensive list of current literature in this field is also included.

Restricted access

Abstract  

A study of trace elements in hair samples from two children of different sex on different sampling dates has been carried out using INAA. Using several combinations of irradiation, cooling and counting times, about thirty elements were quantitatively determined. Some conclusions could be drawn from the data obtained.

Restricted access