Further discussion on the intercomparison of the trace metal concentrations and particle size of fluvial sediment recovered from two centrifuge systems
✍ Scribed by S. Santiago; R. L. Thomas; J.-L. Loizeau; P.-Y. Favarger; J.-P. Vernet
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 360 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0885-6087
No coin nor oath required. For personal study only.
✦ Synopsis
A single large volume water sample taken at the mouth of the Upper Rhone River on Lake Geneva was processed directly in parallel through two continuous flow centrifuges, a Westphalia and an Alfa-Laval. Sediment was recovered from the Westphalia, and separately from the bowl and brass core of the Alfa-Lad. The three sediment samples were analyzed for particle size and the following elements: Zn, Cu, Mn, Cr, P, Co, H, V, Be, Sr, Na, Pb, Ni, Ba, Fe, Ca, and Mg. Results indicate that the particle size recovery of both machines is similar when sediment from the brass core and bowl of the Aka-Lava1 are combined, and that the recovery for all elements other than Cu, V, B, and Pb are the same when the particle size ditrerences are taken into account. Sediment from the Alfa-Lava1 brass core is clearly contaminated by Cu, B and is also elevated in V and Pb but not to a significant extent. The sediment recovered from the bowl of the Alfa-Lava1 is contaminated only with Cu, with a LO ppm increase over the 52 ppm recovered in the Westphalia sediment. Operating procedures involve the discarding of the brass core sediment and the mixing of the Alfa-Lava1 bowl sediment with that from the Westphalia. The consequent increase in Cu is estimated at less than 5 ppm or within the confidence level of the analysis. These procedures are recommended to all operators of non modified Alfa-Lava1 units.