New Zealand Journal of Agricultural Research abstracts
Mobility of the constituents of chromated copper arsenate in a shallow sandy
soil
G. ALLINSON
N. J. TUROCZY
Y. KELSALL
M. ALLINSON
F. STAGNITTI
J. LLOYD-SMITH
School of Ecology and Environment
Deakin University
Warrnambool Vic 3280, Australia
M. NISHIKAWA
Regional Environment Division
National Institute for Environmental Studies
16-2 Onogawa
Tsukuba
Ibaraki 305-0053, Japan
Abstract Small volumes of a commercial timber preservative
containing approximately 60% w/w chromated copper arsenic (CCA) were applied to
15-cm-deep, undisturbed soil monolith lysimeters containing the surface horizon
of a mildly acidic, sandy loam soil extracted from within the forestry
plantation region of south-west Victoria. The collected leachate and samples of
the core profiles were analysed by inductively coupled plasma emission
spectroscopy (ICP-ES) for a total of 28 elements, including the active
ingredients of the preservative, copper, chromium, and arsenic.
After application of CCA, of the metals studied, only the concentrations of
arsenic, calcium, chromium, sodium, and potassium in the leachate differed from
background concentrations during the irrigation of the cores. Copper
concentrations in all leachate remained at background levels throughout the
experiment. Up to 36% of the applied dose of chromium was detected in the
leachate, with breakthrough at 15 cm soil depth occurring within 20 days of
preservative application. Up to 13% of the applied dose of arsenic
was detected in the leachate collected at 15 cm depth, although in this case
breakthrough was not observed until 25 days after preservative application. The
applied copper was immobilised in the top 4 cm of the soil. Elevated
concentrations of arsenic and chromium were found in the top 6 cm of the soil
profile.
Keywords heavy metals; timber preservatives; acid sandy
soils; copper; chromium; arsenic; soil pollution
New Zealand Journal of Agricultural Research, 2000, Vol. 43: 149-156
0028-8233/00/4301-00149 $7.00/0 (c) The Royal Society of New Zealand
2000
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