7 research outputs found
Crystal structure of lutetium disilicate, Lu2Si2O7
Lu2O7Si2, monoclinic, C12/m1 (No. 12), a 6.762(2) Angstrom, b = 8.835(3) Angstrom, c = 4.711(2) Angstrom, beta = 101.99(4)degrees, V = 275.3 Angstrom(3), Z = 2, R-gt(F) = 0.019, wR(ref)(F-2) = 0.045, T = 293 K
Concentrations of As, Cd, Cr, Ni, and Pb in the echinoid Paracentrotus lividus on the coast of Civitavecchia, northern Tyrrhenian Sea, Italy
This is the accepted manuscript of the paper " Concentrations of As, Cd, Cr, Ni, and Pb in the echinoid Paracentrotus
lividus on the coast of Civitavecchia, northern Tyrrhenian Sea, Italy", published as final paper in "Regional Studies in Marine Science 1 (2015) 7–17"
Scanu S, Soetebier S, Piazzolla D, Tiralongo F, Mancini E, Romano N, Marcelli M (2015). Concentrations of As, Cd, Cr, Ni, and Pb in the echinoid Paracentrotus lividus on the coast of Civitavecchia, northern Tyrrhenian Sea, Italy. Regional Studies in Marine Science 1 7–17. DOI: 10.1016/j.rsma.2015.02.001.
This work assessed the levels of As, Cd, Cr, Ni, and Pb in soft tissues (gonads and gut) of specimens of
Paracentrotus lividus (Lamarck, 1816) collected from the coast of Civitavecchia, in the northern Tyrrhenian
Sea. The average levels, in order of concentration, were 14.64 mg/kg As, 3.58 mg/kg Cr, 1.18 mg/kg Pb,
1.15 mg/kg Ni, and 0.07 mg/kg Cd. Dry weight concentrations described bioaccumulation of As and Cr, and,
to a lesser extent, Ni and Pb. A hotspot of As at the station near the delta of Marangone stream reflected
the effect of mine waste deposits of galena, pyrite, and marcasite in this basin. The As concentration
in the northern part of the study area increased closer to the Mignone delta, and according to the
prevailing winds, this could reflect enrichment from the combustion of coal at the Torrevaldaliga power
plant. Comparing data with the literature, As in marine sediments show a ratio of 0.7 in the tissues of
P. lividus from the Civitavecchia area. These results were also compared to those found in P. lividus in
an environmental biomonitoring program currently ongoing to control the emissions from the coal-fired
power plant in Torrevaldaliga Nord, highlighting a substantial quantitative correspondence. In view of
the presence of various industrial activities in the study area that can influence the enrichment of these
elements, this work emphasizes the need for performing further studies aimed at assessing the actual
contribution of anthropogenic activities even when the background concentrations in marine sediments
and marine organisms are high, because burning coal is considered the major anthropogenic source of
many trace elements especially As