Aluminium in UK rivers: a need for integrated research related to kinetic factors, colloidal transport, carbon and habitat
- Neal, Colin
- Rowland, Philip
- Neal, Margaret
- Jarvie, Helen P.
- Lawlor, Alan
- Sleep, Darren
- Scholefield, Paul
DOIAbstract
Dissolved aluminium concentrations ([Al]) in the <0.45μm filtered fraction are described for 54 UK river sites covering rural, acidic/acid sensitive, agricultural and urban typologies, and wide pH range (4 to 11). High [Al] occurred under acidic conditions and for acid runoff neutralised by bicarbonate rich groundwater. Thermodynamic analysis indicates Al hydroxide/hydroxy-silicate oversaturation at circumneutral pH across the rivers, but undersaturation at lower/higher pH. The oversaturation reflects in part the presence of Al bearing colloids as indicated by (1) [Al] being correlated with components associated with both lithogenic (Fe, Ti and lanthanides) colloids and organic carbon, (2) baseflow studies using cross-flow ultrafiltration a...
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