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EC number: 264-150-0 | CAS number: 63449-39-8
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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Endpoint summary
Administrative data
Description of key information
Additional information
The biodegradation of a C20–30, 42% wt Cl product has been determined in a prolonged test Biochemical Oxygen Demand (BOD) (Madeley and Birtley, 1980) – determined to have a reliability of 2. The test was carried out using an emulsion of the chlorinated paraffin. Two microbial populations were used in the study: firstly a culture from soil collected close to a CP production plant that was acclimatised over an eight week period to a concentration of 20–50 mg/L of the CP; and secondly, a non-acclimatized culture obtained from the effluent of a laboratory activated sludge unit treating domestic sewage. Results were based on comparing BOD to the theoretical oxygen demand (ThOD) and showed 7.5% biodegradation after 25 days for non-acclimated organisms and 23% biodegradation after 25 days for acclimated organisms. To investigate the potential for degradation further, Madeley and Birtley (1980) carried out a series of experiments using a 14C-labelled chlorinated pentacosane (radiolabelled on the central carbon) mixed with the same C20–30, 42% wt Cl product in Hach respirometers with non-acclimated microorganisms. After eight weeks incubation, around 11% of the 14C was collected as 14CO2, indicating that where degradation had occurred it was extensive enough to release the central carbon atom of the C25chain. In addition to the above studies, Madeley and Birtley (1980) also reported preliminary studies investigating the degradation of the C20–30, 42% wt Cl product under anaerobic conditions. The anaerobic bacteria were obtained from anaerobic sludge digesters. Gas production (methane and CO2) in the presence of increasing quantities of an emulsion of the CP was determined over 30 days and compared with controls. No significant increase or decrease in bacterial activity was seen at concentrations of the CP of up to 10% by weight of dry sludge solids. It was concluded that the substance was not toxic to the bacterial population present but also was not actively degraded under these conditions. Additional biodegradation results, reliability 2, by Hildebrecht (1972) were reported by Howardet al.(1975), though the reliability of these data has been questioned as the test systems appear to have contained additional carbon sources that may have been biodegradable under the conditions of the test ( EA 2009). In this study, the biodegradability of a C20-30, 42% wt Cl LCCP and a C20-30, 70% wt Cl LCCP were evaluated using oxygen consumption over 20 hours in a Warburg respirometer or over five days using a BOD method. The sewage seed used was acclimated to up to 100 mg/L of chlorinated paraffins before use in the test. The results obtained are shown in the table below.
Biodegradation Results Reported by Hildebrecht (1972)
Substance |
Formulation Tested |
Warburg Respirometry |
BOD dilution method |
||
Oxygen Consumption (mg/L) |
Degradation* |
BOD (mg/L)
|
Degradation*
|
||
C20-30, 40–42% Cl
|
500 mg/L of a mixture containing 75% LCCP, 5% surfactant and 20% water. |
83 |
17.2% |
120
|
25% |
C20-30, 70% Cl |
500 mg/L of a mixture containing 37.5% LCCP, 37.5% perchloroethylene, 5% surfactant and 20% water. |
298 |
17.2% |
30
|
2% |
Surfactant |
500 mg/L surfactant |
377 |
46.5% |
530
|
65% |
*Degradation was estimated by the authors as the percentage of the theoretical oxygen demand based on the total carbon content of the test solution. Substances other than the chlorinated paraffin contribute to this total carbon content.
Omori (1987) observed the potential for LCCP biodegradation through several soil microorganisms.
Results of dechlorination experiments (Omoriet al., 1987)
Chlorinated paraffin (average formula)
|
Chlorinated Chloride release over 48 hours incubation (mg/l) |
||||
Bacterial strain HK-3 |
Bacterial strain H15-4 |
Bacterial strain HK-6 |
Bacterial strain HK-8 |
Mixed bacterial culture (HK-3, HK-6, HK-8 and HK-10) |
|
C24.5H44.5Cl6.5 (40.5% wt.Cl) |
40 (9.9%)a, b |
13%a |
9 (2.2%)a |
14 (3.5%)a |
50 (33%)a
|
C24.5H41Cl10 (50% wt. Cl) |
15 (3.0%)a
|
9%a
|
9 (1.8%)a |
13 (2.6%)a |
|
C24.5H30Cl21 (70% wt. Cl) |
18 (2.6%)a |
12%a |
10 (1.4%)a |
12 (1.7%)a |
22 (15%)a |
Notes:aChloride release expressed as a percentage of the total present in the chlorinated paraffin.
bThe pH of the culture medium fell as dechlorination proceeded and may have inhibited growth of the microorganism and hence further dechlorination.
Hoechst AG (1976 and 1977) reported five-day biochemical oxygen demand (BOD5) values for several products: C18–20, 35% Cl, C18–20, 44% Cl, C18–20, 49% Cl and C18–20, 52% Cl. Unfortunately, the reliability of these studies could not be assigned (reliability 4) because few details of how the tests were carried out are given. The results show little or no biodegradation when compared with the measured chemical oxygen demand (COD) values. There is some evidence that LCCPs may be subject to biodegradation in sea water/estuarine sediment (Zitko & Arsenault, 1974 & 1977). It is not possible to derive any biodegradation rates applicable to the marine environment from these data. A study of MCCPs in aerobic sediment system containing oligochaetes (Lumbriculus variegatus), the half-lives of two 14C-labelled C16 chlorinated paraffins were estimated to be about 12 and 58 days for the 35% and 69% chlorinated paraffin, respectively (Fisk 1998).
Overall, the data indicate that while LCCP have not been demonstrated to readily biodegrade in a standard screening assay, there is evidence that they will biodegrade in the enviroment.
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