Re: Scie chimiche- dibattito- Ma scusate...

Inviato da  cagliostro il 15/10/2011 2:48:18

Eh, questo è interessante, tutte le misurazioni della letteratura scientifica, su aria, particolati, acqua piovana e neve, e dice che non vi è correlazione con l'industrializzazione ...

http://www.atsdr.cdc.gov/toxprofiles/tp24-c6.pdf

The concentration of barium in ambient air is estimated to be <0.05 μg/m3 (IPCS 1991).

there is no apparent
correlation between the degree of industrialization and barium concentrations in ambient air (Winkler
2002)

Tabor and Warren (1958) report urban and suburban air concentrations of barium ranging from <0.005 to
1.5 μg/m3. In another study of barium concentrations in ambient air, values ranged from 0.0015 to
0.95 mg/m3 (EPA 1984). No distinct pattern related to industrialization appeared in the results reported
on 754 samples from 18 cities and four suburban areas in the United States

Barium has been measured in dust samples taken from 49 residences in Ottawa, Canada. Mean and
median concentrations of 405.56 and 222.22 mg barium/kg dust, respectively, were measured within a
sub-fraction of the dust samples where the particulate sizes ranged from 100 to 250 μm (Butte and
Heinzow 2002; Rasmussen et al. 2001).

Barium has been measured in rain and snow collected near Claremont, New Hampshire in 1996–1997
(Feng et al. 2000). Barium concentrations in rain ranged from 0.22 to 0.84 μg/L with a mean
concentration of 0.39 μg/L. In snow, barium concentrations ranged from 0.64 to 7.44 μg/L with a mean
concentration of 1.5 μg/L.