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Environmental fate & pathways

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Endpoint:
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Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
October 1988 to 02 June 1989
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1989
Report Date:
1989

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: EPA Guideline 163-1
Deviations:
no
GLP compliance:
yes
Type of study:
soil leaching
Media:
soil - air

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
- Name of test material (as cited in study report): [U]14C]-2,6-dichlorobenzonitrile
- Lot/batch No.: AOI87HO5A
- Radiochemical purity (if radiolabelling): 98.9 % (radiolabel); 98.8 % (chemical)
- Specific activity (if radiolabelling): 16.9 mCi/g (625 MBq/g)
- Locations of the label (if radiolabelling): phenyl ring

Results and discussion

Any other information on results incl. tables

The average amount of [14C]-dichlobenil equivalents added to each column was 73.8 µg consisting of 63.3 µg test material, 2.2 µg 2,6-dichlorobenzamide and 5.7 µg bound residue.

After leaching with 2 L water, volume and radioactivity of the effluent were determined, amounting to approximately 3% of the applied amount of radioactivity (see Table 1). Identification of the radioactivity in the leachate was not performed as the volume was too large compared to the total amount of radioactivity present.

Table 1: Volume and radioactivity recorded of the effluent

   Column 1  Column 2
 Time (days)  Volume (mL)  Radioactivity (% of added)  Volume (mL)  Radioactivity (% of added)
 3  596  <0.4  547  <0.4
 4  251  0.2  232  0.4
 5  273  1.3  240  1.1
 6  227  0.6  209  0.6
 7  210  0.3  191  0.3
 12  417  0.5  499  0.6
 Total  1974  3.0  1918  3.1

The amounts of radioactivity present at various depths in the sandy loam column are summarised in Table 2.

Table 2: Distribution of radioactivity in columns (µg)

   Column 1  Column 2
 Sediment code and depth (cm)  Extractable  Non-extractable  Extractable  Non-extractable
 C (1)  6.83  1.1  6.63  1.4
 B1 (3)  10.71  1.4  n.d  n.d
 B2 (5)  10.82  0.8  12.43  0.9
 B3 (7)  13.97  1.1  11.00  0.8
 B4 (9)  11.82  0.8  9.65  <0.7
 B5 (11)  6.50  <0.7  7.09  <0.8
 B6 (13)  0.58  <0.5  1.97  <0.6
 B7 (15)  <0.24  <0.6  n.d.  n.d.
 B8 (17)  <0.24  <0.7  <0.24  <0.7
 B9 (19)  <0.08  <0.6  <0.08  <0.6
 B10 (21)  <0.08  <0.7  <0.08  <0.6
 B11 (23)  <0.08  <0.7  <0.08  <0.7
 B12 (25)  n.d  n.d.  <0.08  <0.7
 B13 (27)  <0.08  <0.6  <0.08  <0.6
 B14 (29)  <0.08  <0.7  <0.08  <0.6
 B15 (31)  <0.08  <0.8 <0.08  <0.7
 Total  61.23  5.2  48.77  2.8

n.d. = not determined due to breakage (soil was spilled)

As most of the radioactivity was primarily found in the top 15 cm layer, identification has been performed for that part only. The radioactivity consisted mainly of test material (87 -92 %), 2,6 -dichlorobenzamide (1.8 -3.7 %) and approximately 6 % on the column was non-extractable.

Applicant's summary and conclusion

Conclusions:
Under the conditions of the test, after 31 days ageing, the test material does not penetrate further than 15 cm in a sandy loam soil whereas only 3 % of the aged residue had leached through the column.
Executive summary:

In a GLP compliant aged residue column leaching study conducted in line with standardised guideline EPA 163-1, the mobility of the test material was determined. Under the conditions of the test, the test material does not penetrate further than 15 cm in sandy loam soil after 31 days ageing and only 3 % of the aged residue had leached through the column.