scholarly journals Assessment of trace elements natural enrichment in topsoil by some Italian case studies

2020 ◽  
Vol 2 (8) ◽  
Author(s):  
Giuseppe Sappa ◽  
Maurizio Barbieri ◽  
Francesca Andrei
2020 ◽  
Vol 28 (2) ◽  
pp. 138-163
Author(s):  
C.W. Cuss ◽  
C.N. Glover ◽  
M.B. Javed ◽  
A. Nagel ◽  
W. Shotyk

The concentrations of trace elements (TEs) in large boreal rivers can fluctuate markedly due to changing water levels and flow rates associated with spring melt and variable contributions from tributaries and groundwaters, themselves having different compositions. These fluctuating and frequently high concentrations create regulatory challenges for protecting aquatic life. For example, water quality criteria do not account for changes in flow regimes that can result in TE levels that may exceed regulatory limits, and neither do they account for the markedly different lability and bioaccessibility of suspended solids. This review addresses the geochemical and biological processes that govern the lability and bioaccessibility of TEs in boreal rivers, with an emphasis on the challenges posed by the colloidal behaviour of many TEs, and their relationship to the dissolved fraction (i.e., <0.45 μm in size). After reviewing the processes and dynamics that give rise to the forms and behaviour of TEs in large boreal rivers, their relevance for aquatic organisms and the associated relationships between size and lability and bioaccessibility are discussed. The importance of biological variables and different forms of TEs for limiting lability and bioaccessibility are also addressed. Two case studies emphasize seasonal fluctuations and accompanying changes in the distribution of TE amongst different size fractions and associated colloidal species in large boreal rivers: the Northern Dvina and one of its tributaries, the Pinega River, both in Russia, and the Athabasca River in Alberta, Canada. Water quality in the Athabasca River is briefly discussed with respect to Canadian guidelines.


Technovation ◽  
2006 ◽  
Vol 26 (4) ◽  
pp. 489-505 ◽  
Author(s):  
Barbara Bigliardi ◽  
Alberto Ivo Dormio ◽  
Anna Nosella ◽  
Giorgio Petroni

2014 ◽  
Vol 14 (1) ◽  
pp. 58-85 ◽  
Author(s):  
Emiliano Di Carlo

Purpose – Under IAS 24 a related party transaction (RPT) is a “transfer of resources, services or obligations between related parties, regardless of whether a price is charged” (IASB). The purpose of this paper is to consider the interest of the business group and the directing activity of the parent company for the interpretation of the RPT. Considering the interest of the group means to interpret the intra-group transactions not as isolated transactions, as usually done by the empirical studies, but in a wider perspective, that of the group. Design/methodology/approach – This paper builds on explanatory multiple case studies in order to answer the following research questions: why the interest of the business group and the directing activity of the subsidiaries by the parent company are important in the interpretation of RPTs. How RPTs can be interpreted in the light of the directing activity of the holding company. Findings – Dominant shareholder tends to demonstrate that the group it is not managed as a single economic entity and sometimes that subsidiaries are not really controlled. The case studies show that a regulation that imposes the transparency of the directing activity has at least two effects: the controlling shareholder finds it convenient to delegate the decision-making power and to not carry out RPTs among firms that do not present clear economic links. Thus, the transparency of the directing activity seems to be a disincentive to the establishment of a pyramidal group with expropriation purposes. Research limitations/implications – It is appropriate that the interpretation of the RPT take into account not only the disclosure of the RPT (e.g. type and nature), but also the following disclosure: the reason and the business purpose that lead to RPT; the interest of the company in engaging such transactions; and the procedures for their approval. The independence of subsidiaries directors is necessary to ensure the management autonomy of the boards, and in the case of directing activity they have to protect outsiders in the case of detrimental transactions ordered by the controlling and directing company that are not carried out in the interest of the group. Originality/value – Unlike what has been done so far by the literature on RPT, this paper considers the interest of the group to interpret the intra-group transactions and the separation between control and direction. It means do not interpret RPT as isolated transactions, as usually done by the empirical studies, but in a wider perspective, that of the group.


2018 ◽  
Vol 123 ◽  
pp. 693-698 ◽  
Author(s):  
Ferrarini Andrea ◽  
Claudio Bini ◽  
Stefano Amaducci

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