Íslenskar landbúnaðarrannsóknir - 01.09.1982, Blaðsíða 13

RESIDUE OF LINURON IN SOILS 11
FIGURE 4.
Typical chart recording using standards of dichloroaniline and fortified potato samples.
4. MYND.
Dœmigerður aflestur frá mtelingu á dichloroaniline stöðlum og staðalbœttum kartöflusýnum.
An average recovery of 22% was
assumed. Although this was a low recov-
ery, the consistency over the range of
fortification was sufficiently good to sug-
gest that the partition losses are constant
and there is justification to make a correc-
tion on this basis.
In table 5 the results are presented for
those potato samples which were analysed
for linuron.
For comparison with these results it
should be noted that the potato sample
which was used for recovery studies was
taken from a field which was known to have
never been treated with linuron or any
other herbicide. Analysis of this sample
gave an apparent residue value of 0.0042
ppm, which if corrected by the same
recovery factor as the treated crops, gives a
level of 0.019 ppm apparent linuron
residue.