Registration Dossier

Environmental fate & pathways

Other distribution data

Currently viewing:

Administrative data

Endpoint:
other distribution data
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1995
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1995
Report Date:
1995

Materials and methods

Principles of method if other than guideline:
Method: other: USEPA Guideline, Subdivision N, Section 163-1
Type of study:
other: Soil column leaching
Media:
other: saturated soil column

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Any other information on results incl. tables

RS-Freetext:
In the non-aged leaching study, between 0.2-1.3 % of the applied  Piperonyl 

Butoxide was eluted from columns of non-aged sandy loam, silt  loam and clay 

loam soil so that distribution coefficients (Kd) could not  be calculated. For 

sand, which had low organic carbon content, 74 % of  the applied 14C-Piperonyl 

Butoxide was eluted and the Kd was determined  to be 0.42 mL/g. Consequently, 

Piperonyl Butoxide showed a low mobility  in 3 of 4 soil types used (clay loam, 

silt loam, sandy loam). The  compound was very mobile on the sand.

In the aged leaching study, approximately 55 % of the applied Piperonyl  Butoxide

 had degraded by the end of the 18-day aging period. A mean of 9  % of the 

applied radioactivity was eluted from the aged soils with a mean  of 80 % 

remaining on the columns, indicating sorption of Piperonyl  Butoxide and its 

degradates during aging. Mainly non-extractable  degradation products evolved 

that were not mobile (24 %). Some  mineralization also occurred (circa 4 %). 

The aged residue data showed  that weakly sorbed acidic degradates of Piperonyl 

Butoxide were leached  in small quantities but that the majority of radioactivity

 was retained  within the soil column.

         Ka

Not stated

         Kd

0.42 mL/g (sand soil)

         Kaoc

Not stated

         Ka/Kd

Not stated

         Degradation products (% of a.s.)

CO2(4 %),3,4-methylenedioxy-6-propyl-benzoic acid (7 %),non-extractable residues (24 %, aged soil columns)

Applicant's summary and conclusion

Conclusions:
14C-Piperonyl Butoxide showed a low mobility in 3 of 4 soil types used (clay loam, silt loam, sandy loam). The compound was very mobile on the sand. Furthermore, Piperonyl Butoxide degraded rapidly during 18 days aging under aerobic conditions on sandy loam soil. About 45 % of the applied radioactivity present as Piperonyl Butoxide could be detected after 18 days. The minor 14C-degradates were slightly more mobile on soil columns than the parent compound.