Íslenskar landbúnaðarrannsóknir - 01.09.1982, Page 12

10 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
These results indicate a difference in
recovery according to soil type, the sandy
soils giving a lower recovery than the
loamy soils. On the basis of these results, it
was decided to correct measured linuron
contents by a factor of 85 for loam type soils
(ppm X 100/85) and by a factor of 70 for
sandy soils. The soils designated sandy
loam were corrected by a factor of 85.
Table 3 shows the results of the linuron
measurements, dry matter and organic
matter determinations. The Norwegian
results from the inter-laboratory compari-
son are also presented in this table.
Potato
The results of recovery studies for potato
samples are presented on table 4.
Figure 4 shows a typical recording from
the Autoanalyser while measuring these
potato sample extracts. It illustrates the
stability of the system even at the high
sensitivity necessary at these low levels of
dichloroaniline.
TABLE 4.
Recovery of linuron from potatoes.
4. TAFLA.
TABLE 5.
Levels of linuron in potato samples on a fresh
weight basis. The linuron measurement is a result
of a single analysis and was corrected for recovery
of 22%.
5. TAFLA.
Linuron magn í kart'óflusýnum (miðað við ferskvigt).
Uppgefið magn er niðurstaða einnar mtelingar og hefur
verið leiðrétt með tilliti til 22 % heimtu.
Sample Soil Linuron
(nr) type (ppm)
Sýni Jarðv. Linuron
(nr) gerð (ppm)
1 Loamy 0.033
2 >J 0.037
3 >> 0.032
4 >> 0.037
5 >> 0.026
6 >> 0.039
7 >> 0.032
8 >> 0.033
9 >> 0.031
15 sand/loam 0.039
16 sandy 0.050
17 >> 0.032
18 >> 0.043
19 >> 0.043
20 >> 0.029
21 >> 0.047
22 0.044
23 >> 0.035
24 >> 0.050
25 >> 0.041
26 loamy 0.038
Heimta á linuron úr kartöflum.
Fortification Linuron Linuron Recovery
level (mg/kg) measured corrected for (%)
(mg/kg) blank (mg/kg)
Breting Linuron Linuron Heimta
(mg/kg) melt leiðrétt fyrir (%)
(mg/kg) blank (mg/kg)
Untreated (Blank) 0.0042 * — -
0,045 |0.0140 0.0098 22
0.090 0.0229 0.0187 21
0.135 0.0342 0.0300 22
0.180 0.0452 0.0410 23
*Apparent residue due to compounds other than Jinuron.
*Það magn, er þarna mælist, stafar af öðrum efnasamböndum en linuron.