Sediment chemistry of the Colorado River delta of Lake Powell, Utah, 2001

Hart, R. J.; Taylor, Howard E.; Antweiler, Ronald C.; Graham, DN; Fisk, G.G.; Riggins, S.G.; Flynn, Marilyn E.

doi:10.3133/ofr20051178

Cited by 7 publications

(1 citation statement)

References 13 publications

(8 reference statements)

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“…In a bottom sediment core from Lake Powell, Utah (Fig. 10 in Hart et al 2005), the B concentration peak at the boundary of ferrous Fe oxidation (indicated by the typical colour shift) is clearly seen, most probably as the result of B coprecipitation via sorption onto ferric Fe compounds. Thus, B mobility can indirectly be affected by sediment redox processes.…”

Section: Bottom Sedimentsmentioning

confidence: 99%

Boron sources, speciation and its potential impact on health

Kot

2008

Rev Environ Sci Biotechnol

126

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The behaviour of boron (B) and its fate in the environment remains in many respects obscure. The major B sources and fluxes seem to have been identified, although there are many uncertainties about the magnitude and importance of each; published evaluations vary greatly. Little is known about B speciation of living matter-bearing formations, i.e. soils, natural waters, and sediments. Many authors suppose that B in nature occurs only as oxocompounds, although, natural inorganic and organic B compounds and complexes have been described. Moreover, the most common approach to B biogeochemistry in terms of inorganic B compounds (as boric acid and borates) seems to oversimplify the matter. Data on the physiological functions of B are fragmentary and often contradictory. Some data exists on endemic symptoms and diseases among humans and grazing cattle that are supposedly triggered by B abundance in the natural environment. Unfortunately, the published data are scarce and vague. In this paper, we review the up-to date references on B sources, turnover, and speciation in the environment and the element potential impact on health.

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Section: Bottom Sedimentsmentioning

confidence: 99%

Boron sources, speciation and its potential impact on health

Kot

2008

Rev Environ Sci Biotechnol

126

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Lichens Used as Monitors of Atmospheric Pollution Around Agadir (Southwestern Morocco)—A Case Study Predating Lead-Free Gasoline

Monna

Bouchaou

Rambeau

et al. 2011

Water Air Soil Pollut

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More than 30 epiphytic lichens, collected in Agadir (Morroco) and along a 150-km transect from the Atlantic Ocean eastward, were analyzed for their metal content and lead isotopic composition. This dataset was used to evaluate atmospheric metal contamination and the impact of the city on the surrounding area. The concentrations of Cu, Pb, and Zn (average±1 SD) were 20.9±15.2 μg g −1 , 13.8±9.0 μg g −1 , and 56.6±26.6 μg g −1 , respectively, with the highest values observed in lichens collected within the urban area. The 206 Pb/ 207 Pb and 208 Pb/ 207 Pb ratios in the lichens varied from 1.146 to 1.186 and from 2.423 to 2.460, respectively. Alkyllead-gasoline sold in Morocco by the major petrol companies gave isotopic ratios of 206 Pb/ 207 Pb=1.076-1.081 and 208 Pb/ 207 Pb=2.348-2.360. These new, homogeneous values for gasolinederived lead improve and update the scarce isotopic database of potential lead sources in Morocco, and may be of great value to future environmental surveys on the presence of lead in natural reservoirs, where it persists over time (e.g., soils and sediments). The interest of normalizing metal concentrations in lichens to concentrations of a lithogenic element is demonstrated by the consistency of the results thus obtained with lead isotopic ratios. Leaded gasoline contributed less than 50% of the total amount of lead accumulated in lichens, even in areas subject to high vehicular traffic. This strongly suggests that the recent banishment of leaded gasoline in Morocco will not trigger a drastic improvement in air quality, at least in Agadir.

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