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Physical & Chemical properties

Additional physico-chemical information

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Administrative data

Endpoint:
additional physico-chemical information
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1991
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991
Report Date:
1991

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
ABC Protocol GC-1250 Determination of Air-water Henry's Law costant for the Piperonil butoxide "
the method measures the relative concentration in the liquid phase while isothermally stripping the compound from solution by bubbling gas at a known flow rate.
-V dc/dt= PG/RT = HGC/RT

V=volume of the test solution (ml)
P=vapour pressur of the test compound (atm)
R=gas costant 0.0821 l.atm.mol^-1.k^-1
T=temperature (K)
G=flow rate of stripping gas (mL/hr)
H=Henry law costant (l.atm.mole)
C=concentration of the test compound in solution (ug/ml)
t=time (hr)
GLP compliance:
no
Endpoint investigated:
other: Henry Law costant

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Results:
Duplicate test systems stripping 14C-piperonyl butoxide from deionized water with nitrogen gas provided en estimated value for the Henry's Law Constant of  2.35 x 10-4 1-atm/mole.

Any other information on results incl. tables

Seven data points from each test system were collected in triplicate over a

21 day period.

The mean flow rates of each system were 300 ml/min for system A and 300 ml/min

for system B for the 21 day period.

The results suggest that the substance would have little tendency to volatilize from aqueous solution under conditions similar to this study.

Applicant's summary and conclusion

Conclusions:
The Henry's Law Constant of 14C-piperonyl butoxide in deionized water was  estimated to be less than 2.35 x 10-4 1-atm/mole.