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EC number: 215-572-9
CAS number: 1332-65-6
see Executive summary
The phospholipid fatty acid (PLFA) pattern was analyzed in a
forest humus and in an arable soil experimentally polluted with Cd, Cu,
Ni, Pb, or Zn at different concentrations. In both soil types, there
were gradual changes in the PLFA patterns for the different levels of
metal contamination. The changes in the forest soil were similar
irrespective of which metal was used, while in the arable soil the
changes due to Cu contamination differed from those due to the other
metals. Several PLFAs reacted similarly to the metal amendments in the
two soil types, while others showed different responses. In both soils,
the metal pollution resulted in a decrease in the iso-branched PLFAs
i15:0 and i17:0 and in the monounsaturated 16:1ω5 and 16:1ω7c fatty
acids, while increases were found for i16:0, the branched br17:0 and
br18:0, and the cyclopropane cy17:0 fatty acids. In the forest soil, the
methyl branched PLFAs 10Me16:0, 10Me17:0, and 10Me18:0 increased in
metal-polluted soils, indicating an increase in actinomycetes, while in
the arable soil a decrease was found for 10Me16:0 and 10Me18:0 in
response to most metals. The bacterial PLFAs 15:0 and 17:0 increased in
all metal-contaminated samples in the arable soil, while they were
unaffected in the forest soil. Fatty acid 18:2ω6, which is considered to
be predominantly of fungal origin, increased in the arable soil, except
in the Cu-amended samples, in which it decreased instead. Effects on the
PLFA patterns were found at levels of metal contamination similar to or
lower than those at which effects on ATP content, soil respiration, or
total amount of PLFAs had occurred.
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