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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Administrative data

Endpoint:
biodegradation in water and sediment: simulation tests
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2007
Reliability:
2 (reliable with restrictions)
Cross-reference
Reason / purpose for cross-reference:
reference to other study

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
2007
Report date:
2007

Materials and methods

Test guideline
Qualifier:
no guideline available
Principles of method if other than guideline:
The objective of the study was to determine the depletion rate of KMPS triple salt (2KHSO5*KHSO4*K2SO4) in synthetic pool water in the presence and absence of components of human bather load.
Body fluid analog (BFA) was dosed into half the synthetic pool water samples (SPW) at a level of 1 %. The other half of SPW samples was not exposed to BFA.
Test solutions were incubated at 29 +/- 1°C for approximately 22 hours (SPW with BFA) or approximately 48 hours (SPW without BFA). Samples were taken at different intervals within the incubation period and the depletion of KHSO5 in the test solutions was followed by standard DPD/FAS titration.
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Pentapotassium bis(peroxymonosulphate) bis(sulphate)
EC Number:
274-778-7
EC Name:
Pentapotassium bis(peroxymonosulphate) bis(sulphate)
Cas Number:
70693-62-8
Molecular formula:
H3K5O18S4
IUPAC Name:
pentapotassium bis(peroxymonosulphate) bis(sulphate)
Details on test material:
- Name of test material: Oxone® potassium monopersulfate (KMPS triple salt)
- Composition: the test material KMPS triple salt contains 45 % of potassium monopersulfate
- Lot/batch No.: not indicated
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
Not applicable
Radiolabelling:
no

Results and discussion

Details on results:
Rate Constant
SPW with BFA: ca. 0.23 hr-1
SPW without BFA: ca. 0.006 hr-1

DT50
In swimming pool water containing human bather load in the form of body fluid analog, the decomposition of KHSO5, was very rapid with a DT50 value of approximately 3 hours. In the presence of organic compounds, KHSO5 is consumed in oxidation reactions (e.g. with reduced amine substrate components of the BFA) according to the following general reaction.
KHSO5 + X -> KHSO4 + X=O
In contrast, the lifetime of KHSO5 in the absence of BFA is significantly longer with an extrapolated half-time for decomposition of ca. 120 hours.
In the absence of organic compounds, KHSO5 depletion occurred due to the uncatalyzed disproportionation of the peroxygen active species:
KHSO5 -> KHSO4 + ½ O2

Applicant's summary and conclusion

Validity criteria
Validity criteria fulfilled:
not specified
Executive summary:

Materials and methods

The objective of the study was to determine the depletion rate of KMPS triple salt (2KHSO5*KHSO4*K2SO4) in synthetic pool water in the presence and absence of components of human bather load.

Synthetic pool water was prepared by the addition to de-ionised water of 0.15 g/L sodium bicarbonate and 0.32 g/L calcium chloride dehydrate to adjust total alkalinity to 100-120 mg/L and calcium hardness to 240-260 mg/L as calcium carbonate. The pH was adjusted to 7.4-7.6 with either sodium bisulfate or sodium carbonate, as needed.

Body fluid analog (BFA) was dosed into half the synthetic pool water samples (SPW) at a level of 1 %. The other half of SPW samples was not contaminated with BFA.

KMPS triple salt was dosed at an initial concentration of 12 mg/L to SPW samples and to SPW samples contaminated with body fluid analog.

Test solutions were incubated at 29 +/- 1°C for approximately 22 hours (SPW with BAF) or approximately 48 hours (SPW without BFA). Samples were taken at different intervals within the incubation period and the depletion of KHSO5 in the test solutions was followed by standard DPD/FAS titration.

Results and discussion

Rate Constant

SPW with BFA: ca. 0.23 hr-1

SPW without BFA: ca. 0.006 hr-1

DT50

In swimming pool water containing human bather load in the form of body fluid analog, the decomposition of KHSO5, was very rapid with a DT50 value of approximately 3 hours. In the presence of organic compounds, KHSO5 is consumed in oxidation reactions (e.g. with reduced amine substrate components of the BFA) according to the following general reaction.

KHSO5 + X -> KHSO4 + X=O

In contrast, the lifetime of KHSO5 in the absence of BFA is significantly longer with an extrapolated half-time for decomposition of ca. 120 hours.

In the absence of organic compounds, KHSO5 depletion occurred due to the uncatalyzed disproportionation of the peroxygen active species:

KHSO5 -> KHSO4 + ½ O2