@Article{Heaton1984,
author="Heaton, T. H. E.",
title="Sources of the nitrate in phreatic groundwater in the western Kalahari",
journal="Journal of Hydrology",
year="1984",
volume="67",
number="1",
pages="249--259",
abstract="Elevated levels of nitrate occur in phreatic groundwater in the western Kalahari, Namibia. Nitrate in water containing 0.4--3.1 meq NO-3l-1, of widespread occurrence, has $\delta$15N values in the range +4.9 to +8.0{\texttenthousand}, suggesting natural derivation from the soil. The sporadic occurrence of very high levels of nitrate (> 4 meq NO-3l-1), which has $\delta$15N between +9.3 to +18.7{\texttenthousand}, reflects pollution derived from animal waste. The importance of considering the possible isotopic effects of denitrification, and the significance of leaching in the nitrogen budget of the Kalahari soil, are also discussed.",
optnote="exported from refbase (http://www.uhydro.de/base/show.php?record=278), last updated on Fri, 02 Feb 2024 12:59:03 +0100",
issn="0022-1694",
opturl="https://www.sciencedirect.com/science/article/pii/0022169484902440"
}