| Title: |
An investigation of chromium and nickel uptake in tomato plants irrigated with treated waste water at the Glen Valley farm, Gaborone, Botswana |
| Contributors: |
Schoeman, J.J. (Jakob Johannes); Areola, O.; Adetogun, Adeyemo Adekanmi |
| Publisher Information: |
University of Pretoria |
| Publication Year: |
2013 |
| Collection: |
University of Pretoria: UPSpace |
| Subject Terms: |
Ph effect; Nickel uptake; Chromium uptake; Treated waste water; Tap water; Tomato plants; Irrigation; Sludge absent soil; Sludge amended soil; UCTD |
| Description: |
Dissertation (MSc)--University of Pretoria, 2011. ; The use of treated waste water for irrigation of vegetable crops is on the increase in Botswana especially in the Glen Valley farms, a peri-urban settlement of Gaborone city. However, the effects of this practice on heavy metals uptake by vegetable crops are uninvestigated. Chromium and nickel have been reported to be accumulating in Gaborone crop soils and cultivating vegetables in these soils with treated waste water could potentially lead to an increased bio-availability of the heavy metals in the vegetable crops. The main aim of this study was therefore to compare the uptake of chromium and nickel in tomato plants, a vegetable grown in sludge amended Glen Valley soils, to those grown in sludge absent Glen Valley soils using treated waste water at different pH values and tap water for irrigation. The high water uptake and high water consumption rate of tomato plants made it suitable for this study. Twenty five pots each containing 2.5 kg sludge amended Glen Valley soils and 5 pots each containing 2.5 kg sludge absent soils were utilized. Fresh treated waste water in a 50 L plastic container on a need by need basis was used. For the control experiments 5 pots each containing 2.5 kg standard commercial soils and fresh tap water were used. The potted tomato plants were cultivated from early May to middle of October 2009. One leaf and one fruit from each tomato plant was harvested and tested in this study. The highest uptakes of chromium (0.819 mg/L) and nickel (0.327 mg/L) were experienced in the leaves where the tomato plant were cultivated in standard commercial soil and irrigated with tap water at pH 7.0. The least uptake of chromium (0.052 mg/L) and that of nickel (-0.030 mg/L) was found in the fruits, where the tomatoes were grown in sludge amended Glen Valley soil and irrigated with normal Glen Valley treated waste water at pH 8.5. Increasing the pH of the treated waste water from 5.0 to 6.0 caused increased bio-accumulation of chromium and nickel in the ... |
| Document Type: |
doctoral or postdoctoral thesis |
| File Description: |
application/pdf |
| Language: |
unknown |
| Relation: |
Adetogun, AA 2010, An investigation of chromium and nickel uptake in tomato plants irrigated with treated waste water at the Glen Valley farm, Gaborone, Botswana, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28127 >; E11/9/129/gm; http://hdl.handle.net/2263/28127 |
| Availability: |
http://hdl.handle.net/2263/28127; http://upetd.up.ac.za/thesis/available/etd-09222011-100815/ |
| Rights: |
© 2010, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| Accession Number: |
edsbas.ED76A5DF |
| Database: |
BASE |