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EC number: 211-546-6 | CAS number: 661-19-8
- 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
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
- Endpoint:
- long-term toxicity to aquatic invertebrates
- Type of information:
- other: expert statement
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Based on ecotoxicological information available on the alcohols category, a reliable expert statement has been formulated.
- Justification for type of information:
- Please refer to attached justification documents
- Qualifier:
- no guideline required
- Principles of method if other than guideline:
- The category data has been evaluated and an expert judgement statement has been formulated based on known toxic mode of action and water solubility of the test susbtance.
- GLP compliance:
- not specified
- Analytical monitoring:
- not required
- Test organisms (species):
- Daphnia magna
- Test type:
- other: not an experimental value
- Water media type:
- not specified
- Limit test:
- no
- Remarks on exposure duration:
- not an experimental value
- Reference substance (positive control):
- not required
- Duration:
- 21 d
- Dose descriptor:
- NOEC
- Effect conc.:
- >= 0.001 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- other: expert judgement
- Remarks on result:
- other: non-toxic at the limit of solubility
- Validity criteria fulfilled:
- not applicable
- Conclusions:
- The substance has been estimated by expert judgement to be non-toxic at the limit of solubility, i.e. a NOEC value of ≥0.001 mg/L. The statement is based on the available data in the category group, which indicates that no toxicity is observed at the limit of solubility with alcohols with carbon chain lengths ≥C15.
- Endpoint:
- long-term toxicity to aquatic invertebrates
- Type of information:
- other: experimental result for constituent C15 of multiconstituent substance
- Adequacy of study:
- key study
- Study period:
- 2005-04-20 to 2005-05-13
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The study was conducted according to the appropriate OECD test guideline, and in compliance with GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 211 (Daphnia magna Reproduction Test)
- Deviations:
- yes
- Remarks:
- to allow aeration of the vessels, test media eas prepared daily, water changes occured daily, daphnia were carefully rinsed at each water change
- Principles of method if other than guideline:
- Deviations from the guideline was as follows: due to the unavoidable biodegradation process caused by the presence of algae (daphnia feed), severe oxygen depletion occurred, cautious aeration with sterile filtered air was implemented in order to overcome this.
- GLP compliance:
- yes (incl. QA statement)
- Analytical monitoring:
- yes
- Details on sampling:
- - Concentrations: All the test concentrations were sampled for chemical analysis three times a week at renewal of the test media.
- Sampling method: A 500 mL aliquot of the fresh solutions was used for analysis. After 24 h, at the next renewal, the aged test liquids were pooled (vessels 1- 5 and 6-10) and analysed. - Vehicle:
- yes
- Details on test solutions:
- PREPARATION AND APPLICATION OF TEST SOLUTION (especially for difficult test substances)
- Method: Test solutions were prepared daily by stirring the test substance in test media under slow stir conditions (21 h) in sterilized mixing vessels. The mixing vessels were cylindrical brown glass bottles with teflon covered screw caps, fitted with a drain port near the bottom for drawing off the test solution. The volume of the mixing vessels was 2 L. After stirring, the contents of the vessels were left to settle for 2 h. The saturated aqueous phase was then taken out of the drain port. The first fraction 0-100 mL was withdrawn. The fraction between 100 and 1800 mL was used for rinsing (200 mL) and filling (1000 mL) the test flasks for toxicity testing and for analytical measurements (500 mL), if done. Rinsing of the test vessels was carried out to saturate the surfaces of the test vessels. After filling, the vessels were closed immediately by using autoclaved silicone stoppers and only opened to introduce the test organisms and again at the renewals of the test media. The test media were not stored for more than 1 - 2 hours prior to testing.
- Controls: controls were prepared as an ethanolic stock solution using dilution water.
- Chemical name of vehicle (organic solvent, emulsifier or dispersant): ethanol
- Concentration of vehicle in test medium (stock solution and final test solution(s) including control(s)): 1ml in 2 L
- Evidence of undissolved material (e.g. precipitate, surface film, etc): presence of very fine undissolved particles or droplets at the higher test concentrations. - Test organisms (species):
- Daphnia magna
- Details on test organisms:
- TEST ORGANISM
- Common name: water flea
- Strain/clone: Daphnia magna STRAUS
- Source: Umweltbundesamt (German Federal Environment Agency). Test organisms bred in the laboratory of the Fh-IME (testing facility).
- Age of parental stock (mean and range, SD): 4 - 24 hours old
- Feeding during test
- Food type: The Daphnia magna were fed with suspensions of unicellular green algae. The suspensions of Desmodesmus subspicatus (daily prepared from axenic cultures) were controlled analyzed for microbial contamination one and two weeks after test start by using "Cult-Dip combi® Dip Slides (Merck)". No bacterial contamination was detected. The content of food in the test suspensions, measured as turbidity at 758 nm, increased during the test from 7 mg C/L equivalents to 15 mg C/L equivalents.
- Frequency: at each water renewal.
ACCLIMATION
- Acclimation period: bred at the testing facilities
- Acclimation conditions (same as test or not): water is changed once per week instead of daily (breeding in testing facilities).
- Type and amount of food: fed with an algal suspension (Desmodesmus subspicatus) and LiquizellR (HOBBY). Algae growing in the log phase are centrifuged and the pellet is re-suspended in a few ml of medium. 30ml of this suspension is given to 1L Daphnia medium.
- Feeding frequency: daily
METHOD FOR PREPARATION AND COLLECTION OF EARLY INSTARS OR OTHER LIFE STAGES: Newborn daphnia were separated by sieving in the breeding stage before testing. - Test type:
- semi-static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 21 d
- Post exposure observation period:
- none
- Hardness:
- total hardness of dilution water: 0.9 mmol/L
- Test temperature:
- The test temperature during the test was in the range 20.7 to 21.8°C
- pH:
- Mean: 9.2 to 9.4 at all treatment levels
- Dissolved oxygen:
- Range: 66 to 103% (the lowest concentration was equivalent to 5.4 mg/L)
- Salinity:
- Not Applicable
- Nominal and measured concentrations:
- Nominal test concentrations were 0, 30, 65, 139 and 300 µg test item/L. The concentrations were targeted at achieving a top concentration of 200 µg test item/L by taking into account 30% adsorption to glassware.
Mean measured concentrations of the freshly prepared test solutions were- Details on test conditions:
- TEST SYSTEM
- Test vessel:
- Type (delete if not applicable): closed with silicone stoppers
- Material, size, headspace, fill volume: Each Daphnia magna was exposed separately in a numbered vessel flask) containing 100 mL of test medium.
- Aeration: yes
- Renewal rate of test solution: daily:
- No. of organisms per vessel: 1
- No. of vessels per concentration (replicates): 10
- No. of vessels per vehicle control (replicates): 10 (vehicle control was the only control tested)
TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: purified drinking water (filtrated with activated charcoal, passage through limestone column, aeration until oxygen saturation and autoclaved before use).
- Total organic carbon: DOC 0.0 mg/L
- Metals: Cu 0.0019 mg/L, Fe 0.0024 mg/L, Mg 0.0002 mg/L, Zn 0.0000 mg/L
- Alkalinity: 1.4-1.6 mmol/L
- Conductivity: 178-183 uS/cm
- Culture medium different from test medium: no
- Intervals of water quality measurement: every day, before and after renewal of test solution
OTHER TEST CONDITIONS
- Photoperiod: The vessels were subjected to a light/dark cycle of 16/8 hours
- Light intensity: The light intensity was in the range 568 to 659 lux.
EFFECT PARAMETERS MEASURED (with observation intervals if applicable) : The parent Daphnia magna were assessed visually daily for immobility and any other abnormalities in appearance and behaviour. At study termination, the length of the adults was measured by digital photography and image analysis and their statistics compared with those of the control animals. The newborn Daphnia magna in each beaker were counted at each daily renewal of the test solutions, inspected for abnormalities in condition, and removed. The following endpoints observed in the reproduction test were evaluated quantitatively:
o Mortality (immobility) of parental generation Daphnia magna;
o Age at first brood o Total number of offspring per replicate;
o Cumulative Number of live offspring per surviving female at the time of recording;
o Intrinsic rate of increase, r;
o Individual length of adults.
RANGE-FINDING STUDY
- Results used to determine the conditions for the definitive study: No acute Daphnia magna immobility was observed at initial concentrations of up to 500 μg/L (clearly above water solubility according to ref. 12) in non-GLP pre-tests conducted at the same testing facilities.- Reference substance (positive control):
- no
- Key result
- Duration:
- 21 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 7.8 µg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- reproduction
- Remarks:
- cumulative number of offspring
- Duration:
- 21 d
- Dose descriptor:
- LOEC
- Effect conc.:
- 19 µg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- reproduction
- Remarks:
- cumulative number of offspring
- Duration:
- 21 d
- Dose descriptor:
- EC10
- Effect conc.:
- 12 µg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- reproduction
- Remarks:
- cumulative number of offspring
- Remarks on result:
- other: (2-23 95% CL)
- Duration:
- 21 d
- Dose descriptor:
- other: EC20
- Effect conc.:
- 62 µg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- reproduction
- Remarks:
- cumulative number of offspring
- Remarks on result:
- other: (33-350 95% CL)
- Duration:
- 21 d
- Dose descriptor:
- EC10
- Effect conc.:
- > 63 µg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- act. ingr.
- Basis for effect:
- immobilisation
- Details on results:
- - Mortality of parent animals: 0%
- No. of offspring produced per day per female: see Table 1, no significant difference between control and exposed.
- Body length of parent animals: see Table 1, no significant difference between control and exposed.
- Time to first brood release or time to hatch: see Table 1, no significant difference between control and exposed.
- Other biological observations: it was not possible to determine an EC50 in many cases.
- Effect concentrations exceeding solubility of substance in test medium: not thought to have affected the test by the authors.- Reported statistics and error estimates:
- The evaluation of the concentration-effect-relationships and the calculations of effect concentrations were based on mean measured initial concentrations as multiple peak concentrations, as well as on geometric means between mean measured initial and aged (24h) test concentrations. For each endpoint, the NOEC, LOEC, and, if possible, the EC50, EC20 and EC10 were determined. A LOEC and NOEC were calculated by ANOVA followed by Williams' test or an appropriate non-parametric test suggested by the ToxRat program. When the test results showed a concentration-response relationship, the data were analysed by regression using Probit-analysis assuming log-normal distribution of the values using the computer program ToxRat program.
Table 1: Effect of 1 -tetradecanol on growth and survival of D. magna
Treatment (µg/l) Mortality of parents Growth (length) Age at first brood Cumulative offspring per female Intrinsic rate of increase % Mean ± SD (mm) Mean± SD (days) Mean± SD Mean ± SD (1/d) Control* 0 4.47 ± 0.32 7.8± 0.8 86.6± 5.7 0.368± 0.0319 24.4 0 4.83± 0.31 7.7± 0.7 84.0± 7.4 0.364± 0.0343 68.6 0 4.50± 0.38 8.1± 0.7 79.7± 9.4 0.347± 0.0328 185.2 0 4.49± 0.27 8.2± 0.8 73.9± 8.5 0.338± 0.0347 200 30 4.73± 0.40 7.9± 0.6 70.4± 8.2 0.338± 0.0241 *the control is also the solvent control (ethanol).
The daily transfer of daphnia, although rinsed thoroughly, did cause the re-introduction of bacteria, which increased in number with growth of carapace and resulted in more pronounced losses in the last two weeks of the reproduction studies.
Table 2: Nominal and measured concentrations for 21 days.
Measured concentration (μg/L) results Nominal concentration 24.4 68.8 185.2 500 Fresh media Mean* ±st. dev. (%) 10 ± 49% 51 ± 21% 138 ± 20% 367 ± 31% Old media Mean* ±st. dev. (%) <LOQ <LOQ 1.2 ± 134% 16 ± 157% Mean¥ % of nominal (ref. to mean) 1.6 3.6 12.7 76.7 *arithmetic mean of 3 weekly measurements
¥geometric mean of fresh and old means
Table 3.Effect concentrations relative to daily initial concentrations (based on cumulative number of offspring).
Endpoint μg test item/L EC10 70 EC20 270 LOEC 51 NOEC 9.8 - Validity criteria fulfilled:
- yes
- Conclusions:
- A reliable 21 d NOEC repro value of 7.8 ug/L has been identified for the effect of the test substance on the cumulative number of offspring of D. magna.
- Endpoint:
- long-term toxicity to aquatic invertebrates
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Justification for type of information:
- 1. HYPOTHESIS FOR THE CATEGORY APPROACH
The hypothesis is that the category members have similar structures, and long-term toxicity to aquatic invertebrates effects which vary in strength across the category, forming a regular pattern (Scenario 4 in the RAAF). The interpretation of the observed trends of variation of this property across the category is discussed in the endpoint summary.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Please refer to the test material identity information within each endpoint study record and to the endpoint summary. The source chemicals and the target chemical are linear aliphatic alcohols which are members of the long chain linear aliphatic alcohol Category.
The long chain linear aliphatic alcohol Category has at its centre an homologous series of increasing carbon chain length alcohols. The category members are structurally very similar. They are all primary aliphatic alcohols with no other functional groups. The category members are linear or contain a single short-chain side-branch at the 2-position in the alkyl chain, which does not significantly affect the properties (‘essentially linear’). The category members have saturated alkyl chains or contain a small proportion of naturally-occurring unsaturation(s) which does not significantly affect the properties. The branched and unsaturated structures are considered to have such similar properties that their inclusion in the category is well justified.
Impurities: Linear and/or ‘essentially linear’ long chain aliphatic alcohols of other chain lengths may be present. These are not expected to contribute significantly to the properties in respect of this endpoint due to predictable trends (see point 3).
There are no impurities present at above 1% which are not category members or which would affect the properties of the substance.
3. CATEGORY JUSTIFICATION
The category members are structurally very similar (see point 2) and are biochemically very similar. The metabolic synthesis and degradation pathways are well established. This Category is associated with a consistency and predictability in the physicochemical, environmental, and toxicological property data across its members.
The context of trends observed in this property across the range of chain lengths covered by this Category is described in the Endpoint Summary and in the Category Report attached in Section 13.
In this registration, the information requirement is extrapolated based on read-across from members of the category with shorter chain length, providing evidence of the range of values expected for the registration substance.
4. DATA MATRIX
A data matrix for the C6-24 alcohols Category is attached in Section 13. - Reason / purpose for cross-reference:
- read-across source
- Duration:
- 21 d
- Dose descriptor:
- EC10
- Effect conc.:
- 12 µg/L
- Nominal / measured:
- meas. (geom. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- reproduction
- Remarks:
- and cumulative number of offspring
Referenceopen allclose all
Description of key information
Alcohols with chain length carbon number >C15 are not expected to be toxic at the limit of solubility (expert judgement).
A 21-d EC10 of 0.012 mg/l has been determined for the effects of pentadecan-1-ol (CAS 629-76-5, C15) on reproduction of Daphnia magna (Fraunhofer, 2005d).
Key value for chemical safety assessment
Additional information
No reliable measured data are available for long-term toxicity of docosan-1-ol to aquatic invertebrates.
In an expert statement based on ecotoxicological information available on the alcohols category no toxicity is expected at the limit of solubility (Schaefers, 2009).
No aquatic toxicity is expected at chain lengths >C15, therefore a study on long-term toxicity of aquatic invertebrates to pentadecan-1-ol (CAS 629-76-5, C15) has been read across for the purpose of setting an indicative aquatic PNEC for use in assessing risk to the terrestrial compartment, using the equilibrium partitioning method.
A 21-d EC10 of 0.012 mg/l has been determined for the effects of pentadecan-1-ol (CAS 629-76-5, C15) on reproduction of Daphnia magna (Fraunhofer, 2005d).
Discussion of trends in the Category of C6-24 linear and essentially-linear aliphatic alcohols:
Single constituent LCAAs
Data of an acceptable quality are available for 21-day reproduction studies with Daphnia magna for the single carbon chain length LCAAs 1-octanol (Kuhn et al., 1989), 1-decanol, 1-dodecanol, 1-tetradecanol, 1-pentadecanol (Fraunhofer Institute, 2005a-d respectively), pentadecanol branched (ABC 1999a) and octadecanol branched (ABC 1999c). The data were obtained generally in accordance with standard test guideline OECD 211. However some modifications to the normal guideline procedures were necessary to reduce losses of test substances due to the extensive and rapid biodegradation of the LCAAs. The following changes to typical protocols were therefore adopted to enable the performance of high-quality and meaningful studies:
Vessels were closed, to reduce entry of bacteria from the atmosphere;
Gentle aeration of test vessels was required as degradative losses of LCAAs resulted in unacceptably low dissolved oxygen concentrations;
Test solution renewals were made daily, with confirmatory analysis on both renewed and initial test solutions;
Static renewal was determined to be the best exposure regime for long chain aliphatic alcohols as this reduced the transfer of LCAAs -degrading or consuming microbes (as compared to flow-through systems, where it becomes increasingly difficult to discourage acclimation and bio film formation; see Brixham Environmental Laboratory, AstraZeneca, 2004);
Saturated alcohol stock solutions were prepared daily for each test concentration. This involved a detailed preparatory method to reduce the possibility of insoluble material being present in the tests (Fraunhofer Institute, 2005a, b);
Daphnia magna were carefully rinsed with each daily transfer to reduce bacterial cross over to fresh exposure solutions. As Daphnia magna grow in size, this becomes less effective; and,
Dilution water and test vessels were autoclaved prior to use each time (Fraunhofer Institute, 2005a, b, c, d).
Algae have been found to metabolize LCAAs and this is an unavoidable occurrence in long-term studies with Daphnia magna fed with algae. No modifications could be made to counter this without conducting further research into an alternative diet.
In spite of the guideline modifications significant losses of test substance still occurred. It was therefore necessary to report the results both in terms of the mean of the measured concentrations in the fresh media and the mean of the measured concentrations in the fresh and old media. The test substance renewal interval was 24 hours. Survival and reproduction endpoints have been summarised using standard statistical techniques. Conclusions for each test are presented as both NOEC and EC10. The 1-octanol and 1-octadecanol study are reliability 2, valid with restrictions; the other studies are reliability 1.
The effect of LCAAs on Daphnia magna survival is generally less sensitive than the effect on reproduction. A pattern of increased toxicity with increasing chain length is also apparent. In the octanol study, the most sensitive and only reported effect was on time to first brood release which occurred at 1000 µg/L (nominal concentration). For comparison of results across chain lengths and structure activity models the response for survival and reproduction was assumed to be equal to the effect on time to first brood.
The data indicates that for survival and reproduction, the NOEC and EC10 values increase from C14 to C15. This is almost certainly due to exceeding the limit of water solubility as would be expected from conventional toxicological theory (Rufli et al. 1998). Under these circumstances a more accurate interpretation of the results might be obtained by setting the exposure to the solubility of the substance (i.e. 49 µg/L). This has the effect of lowering the toxicity values but they are still higher than those for the C14 substance. This pattern is not in keeping with the trend of reducing short-term toxicity values (i.e. higher toxicity) observed between the C8 and C14 alcohols. Similarly, the NOEC identified for C18 is a limit value of >980 µg/L but a lower value would have been obtained if a lower loading had been tested. A more accurate NOEC would therefore be obtained by expressing it as greater than the water solubility of the test substance, which is 10 µg/L.
It must be appreciated that significant uncertainty exists in identifying the true exposure concentrations in the region of the water solubility of a substance. The water solubility values of the LCAAs category decrease with increasing chain length (see section 1.4 for further details.). In a review of aquatic toxicity testing of sparingly soluble compounds Rufli et al. (1998) point out that interpretation of toxicity responses observed above the solubility limit is aggravated by artefacts and that testing should only occur at or below the limit. For LCAAs with carbon numbers greater than C15 there are significant experimental difficulties in producing, maintaining and quantifying exposures of the test substance due to progressively lower solubility, while exceptionally rapid biodegradability would remain unchanged. This explains why there are no data for such substances.
However, based on the trends observed in the available data, it is expected that for linear LCAAs with carbon numbers ≥C15 the NOEC for long-term effects on mortality and reproduction would be above the solubility limit (Schäfers et al. 2009).
Multi-constituent LCAAs
No measured data are available for multi-constituent substances of different carbon chain length LCAAs.
References:
Rufli, H., P. R. Fisk, A. E. Girling, J. M. H. King, R. Lange, X. Lejeune, N. Stelter, C. Stevens, P. Suteau, J. Tapp, J. Thus, D. J. Versteeg, H. J. Niessen. 1998. Aquatic toxicity of sparingly soluble, volatile, and unstable substances and interpretation and use of data. Ecotoxicology and Environmental Safety 39 (2):72-77.
Schäfers, C. Boshof, U. Jürling, H. Belanger, S.E. Sanderson, H. Dyer, S.D. Nielsen, A.M. Willing, A. Gamon, K. Kasai, Y. Eadsforth, C.V. Fisk, P.R. Girling, A.E., 2009. Environmental properties of long chain aliphatic alcohols. Part 2: Structure-activity relationship for chronic aquatic toxicity of long-chain alcohols. Ecotoxicology and environmental safety. 72(4): 996-1005.
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