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EC number: 215-270-7 | CAS number: 1317-39-1
- 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
Water solubility
Administrative data
- Endpoint:
- transformation / dissolution of metals and inorganic metal compounds
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- The acute transformation/dissolution tests were carried out between 03 Aug 2000 and 14 Aug 2000
- Reliability:
- 2 (reliable with restrictions)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 000
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- other: ECD Guideline for testing of chemicals - draft proposal - February 2000 : Transformation dissolution of metals and metal compounds in aqueous media.
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Guideline for testing of chemicals - draft proposal - December 1998 : Transformation dissolution of metals and sparingly soluble inorganic metal compounds in aqueous media
- Qualifier:
- according to guideline
- Guideline:
- other: Recommendations on parameters for a transformation/dissolution protocol for metals and sparingly soluble metal compounds. ECB meeting, February, 1997, Ispra. Report ECB/TM/9 (97) rev 2.
- Qualifier:
- according to guideline
- Guideline:
- other: Draft report of the OECD workshop on aquatic toxicity testing of sparingly soluble metals, inorganic metal compounds and minerals. Sept. 5-8, 1995 - Ottawa.
- Qualifier:
- according to guideline
- Guideline:
- other: International standard ISO 6341 (1989 (E)). Determination of the inhibition of the mobility of Daphnia magna Straus (Cladocera, Crustacea).
- Principles of method if other than guideline:
- The transformation/dissolution kinetic of a metal or metal compound in an ecotox medium is evaluated from transformation/dissolution testing. After addition of the test substance to the ecotox medium, the test vessels are continuously mixed (laboratory shaker, 100 rpm), the dissolved metal concentrations are meas¬ured at regularly times. The transformation/ dissolution rates and extents are calcu¬lated by statistical analysis, if possible.
- GLP compliance:
- not specified
- Type of method:
- flask method
Test material
- Reference substance name:
- Dicopper oxide
- EC Number:
- 215-270-7
- EC Name:
- Dicopper oxide
- Cas Number:
- 1317-39-1
- Molecular formula:
- Cu2O
- IUPAC Name:
- copper (I) oxide
- Test material form:
- solid: particulate/powder
- Details on test material:
- Purity: 97.8%
Constituent 1
Results and discussion
Solubility of metal ions in aqueous mediaopen allclose all
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- 0.101 mg/L
- Element analysed:
- Copper
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Medium: Swedish water 2
Buffering system: air buffering
initial pH:6.21, pH after 7 days: 6.19
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- 0.122 mg/L
- Element analysed:
- Copper
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Medium: Swedish water 2
Buffering system: HCl/NaOH buffering
Initial pH: 6.21, pH after 7 days 6.09
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- 0.131 mg/L
- Element analysed:
- Copper
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Medium: Swedish water 2
Buffering system: MOP buffering
Initial pH: 6.21, pH after 7 days: 6.12
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- 0.171 mg/L
- Element analysed:
- Copper
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Medium: modified ISO 6341
Buffering system: air buffering
Initial pH: 6.00, pH after 7 days: 6.54
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- 0.232 mg/L
- Element analysed:
- Copper
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Medium: modified ISO 6341
Buffering system: HCl/NaOH buffering
Initial pH: 6.00, pH after 7 days: 6.16
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- 0.361 mg/L
- Element analysed:
- Copper
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Medium: modified ISO 6341
Buffering system: MOP buffering
Initial pH: 6.00, pH afetr 7 days: 6.03
- Details on results:
- The mean dissolved Cu concentrations after 7 days in the natural and artificial media are : Swedish water 2 (Brattfors) : 0.118 +/- 0.020 mg Cu/l; modified ISO 6341 medium : 0.254 +/- 0.090 mg Cu/l.
Any other information on results incl. tables
Acute transformation/dissolution test at 1 mg.l-1 in Swedish surface water - Brattfors (7 days)
The results of the dissolved Cu concentrations measured after 7 days after addi¬tion of Cu2O powder to Swedish water 2 and using different buffering systems are presented in table 1.
The pH, temperature and dissolved oxygen concentration in the different test solutions were measured at the start of the test and at each sampling time : see table 2.
The dissolved Cu concentrations increased in function of time. The dissolved Cu concentration after 7 days were :
- air-buffering : 0.1013 +/- 0.0122 mg Cu.l-1
- HCl/NaOH buffering : 0.1222 +/- 0.0115 mg Cu.l-1
- MOPS buffering : 0.1308 +/- 0.0222 mg Cu.l-1
The statistical analysis revealed that the data could be fitted by a linear model :
- air-buffering : mg Cu.l-1 = 0.0138 * time + 0.0039 R2 = 0.993
- HCl/NaOH buffering: mg Cu.l-1 = 0.0169 * time + 0.0012 R2 = 0.996
- MOPS buffering: mg Cu.l-1 = 0.0182 * time + 0.0030 R2 = 0.998
Acute transformation/dissolution test at 1 mg.l-1 in modified ISO 6341 medium (7 days)
The results of the dissolved Cu concentrations measured after 7 days after addition of Cu2O powder to modified ISO 6341 medium and using different buffering systems are presented in table 3.
The pH, temperature and dissolved oxygen concentration in the different test solutions were measured at the start of the test and at each sampling time : see table 4.
The dissolved Cu concentrations increased in function of time. The dissolved Cu concentration after 7 days were :
- air-buffering : 0.1707 +/- 0.0532 mg Cu.l-1
- HCl/NaOH buffering : 0.2317 +/- 0.0331 mg Cu.l-1
- MOP's buffering : 0.3610 +/- 0.0311 mg Cu.l-1
The statistical analysis revealed that the data could be fitted by a linear model :
- air-buffering : mg Cu.l-1 = 0.0239 * time + 0.0041 R2 = 0.997
- HCl/NaOH buffering: mg Cu.l-1 = 0.0335 * time + 0.0014 R2 = 0.998
- MOP's buffering: mg Cu.l-1 = 0.0510 * time + 0.0050 R2 = 0.999
Table 1 Acute transformation/dissolution test (7 days) : Cu2O, in Swedish surface water 2 – Brattfors - mass loading : 1 mg.l-1 - different buffering systems. Mean (mg dissolved Cu.l-1); SD : standard deviation (mg dissolved Cu.l-1); C.V. : coefficient of variation (%).
Blank Swedish water 2 (after pH adjustment) : < 0.0025 mg Cu.l-1.
Table 1.1 Air buffering
time | test jar | dissolved Cu (mg.l-1) | mean per test jar | mean per sampling time | total SD | total CV |
2 hours | 1 | 0.0044 0.0046 |
0.0045 | 0.0046 | 0.0001 | 3 |
2 | 0.0045 0.0047 |
0.0046 | ||||
3 | 0.0045 0.0047 |
0.0046 | ||||
6 hours | 1 | 0.0075 0.007 |
0.0073 | 0.0080 | 0.0010 | 13 |
2 | 0.0073 0.0076 |
0.0075 | ||||
3 | 0.0094 0.0092 |
0.0093 | ||||
1 day | 1 | 0.0234 0.0217 0.021 |
0.0020 | 0.0233 | 0.0024 | 10 |
2 | 0.0215 0.0215 0.0218 |
0.0216 | ||||
3 | 0.0271 0.026 0.0261 |
0.0264 | ||||
4 days | 1 | 0.0497 0.0496 |
0.0497 | 0.0570 | 0.0083 | 15 |
2 | 00542 0.0536 |
0.0539 | ||||
3 | 0.0677 0.067 |
0.0674 | ||||
7 days | 1 | 00941 0.0931 |
0.0936 | 0.1013 | 0.0122 | 12 |
2 | 0.0922 0.0943 |
0.0933 | ||||
3 | 0.0118 0.0116 |
0.1170 |
Table 1.2 HCl/NaOH buffering
time | test jar | dissolved Cu (mg.l-1) | mean per test jar | mean per sampling time | total SD | total CV |
2 hours | 1 | 0.0039 0.0037 |
0.0038 | 0.0040 | 0.0002 | 5 |
2 | 0.004 0.004 |
0.0040 | ||||
3 | 0.0042 0.0042 |
0.0042 | ||||
6 hours | 1 | 0.0061 0.0061 |
0.0061 | 0.0064 | 0.0005 | 8 |
2 | 0.0058 0.0069 |
0.0064 | ||||
3 | 0.0064 0.007 |
0.0067 | ||||
1 day | 1 | 0.018 0.0187 0.0181 |
0.0183 | 0.0192 | 0.0015 | 8 |
2 | 0.0186 0.018 0.0178 |
0.0181 | ||||
3 | 0.021 0.0212 0.0211 |
0.0211 | ||||
4 days | 1 | 0.053 0.0538 |
0.0534 |
0.0635 | 0.0080 | 13 |
2 | 0.0693 0.071 |
0.0702 | ||||
3 | 0.0671 00665 |
0.0668 | ||||
7 days | 1 | 0.109 0.109 |
0.1090 | 0.1222 | 0.0115 | 9 |
2 | 0.133 0.136 |
0.1345 | ||||
3 | 0.123 0.123 |
0.1230 |
Table 1.3 MOP buffering
time | test jar | dissolved Cu (mg.l-1) | mean per test jar | mean per sampling time | total SD | total CV |
2 hours | 1 | 0.004 0.0043 |
0.0042 | 0.0053 | 0.0010 | 19 |
2 | 0.0064 0.0064 |
0.0064 | ||||
3 | 0.0053 0.0054 |
0.0054 | ||||
6 hours | 1 | 0.0072 0.0067 |
0.0070 | 0.0087 | 0.0016 | 18 |
2 | 0.0104 0.0105 |
0.0105 | ||||
3 | 0.0089 0.0087 |
0.0088 | ||||
1 day | 1 | 0.0176 0.0185 0.0178 |
0.0180 | 0.0233 | 0.0055 | 23 |
2 | 0.0302 0.0303 0.0302 |
0.0302 | ||||
3 | 0.0223 0.0213 0.0213 |
0.0216 | ||||
4 days | 1 | 0.0691 0.0702 |
0.0697 | 0.0740 | 00134 | 18 |
2 | 0.0896 0.0916 |
0.0906 | ||||
3 | 0.0642 0.0594 |
0.0618 | ||||
7 days | 1 | 0.128 0.13 |
0.1290 | 0.1308 | 0.022 | 17 |
2 | 0.156 0.157 |
0.1565 | ||||
3 | 0.107 0.107 |
0.1070 |
Table 2 Results of the pH, temperature and dissolved oxygen measurements during the acute transformation/dissolution test (7 days) : Cu2O powder, in Swedish surface water 2 – Brattfors- mass loading : 1 mg.l-1 - different buffering systems.
Table 2.1 pH
buffering system | replicate | 0 hours | 2 hours | 6 hours | 1 day | 4 days | 7 days |
air buffering | 1 | 6.21 | 6.27 | 6.28 | 6.29 | 6.23 | 6.24 |
2 | 6.29 | 6.30 | 6.32 | 6.21 | 6.12 | ||
3 | 6.28 | 6.28 | 6.34 | 6.26 | 6.20 | ||
mean | 6.28 | 6.29 | 6.32 | 6.23 | 6.19 | ||
sd | 0.01 | 0.01 | 0.03 | 0.03 | 0.06 | ||
HCl/NaOH buffering |
1 |
6.21 |
6.29 |
6.28 |
6.27 |
6.21 |
6.01 |
|
2 |
6.27 |
6.28 |
6.34 |
6.18 |
6.07 |
|
3 |
|
6.30 |
6.29 |
6.39 |
6.18 |
6.18 |
|
mean |
|
|
6.29 |
6.28 |
6.33 |
6.19 |
6.09 |
sd |
|
|
0.02 |
0.01 |
0.06 |
0.02 |
0.09 |
MOP buffering |
1 |
6.21 |
6.22 |
6.23 |
6.17 |
6.17 |
6.13 |
|
2 |
6.21 |
6.22 |
6.23 |
6.19 |
6.13 |
|
|
3 |
6.19 |
6.23 |
6.18 |
6.19 |
6.09 |
|
mean |
|
|
6.21 |
6.23 |
6.19 |
6.18 |
6.12 |
sd |
|
|
0.02 |
0.01 |
0.03 |
0.01 |
0.02 |
Table 2.2 Temperature (°C)
buffering system | replicate | 0 hours | 2 hours | 6 hours | 1 day | 4 days | 7 days |
air buffering |
1 |
22.0 |
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
2 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
3 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
mean |
|
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
sd |
|
|
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
HCl/NaOH buffering |
1 |
22.0 |
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
|
2 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
3 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
mean |
|
|
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
sd |
|
|
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
|
1 |
22.0 |
21.8 |
21.8 |
21.7 |
21.8 |
21.8 |
|
2 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
3 |
|
21.8 |
21.8 |
21.7 |
21.8 |
21.8 |
mean |
|
|
21.8 |
21.8 |
21.7 |
21.8 |
21.8 |
sd |
|
|
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
Table 2.3 Dissolved oxygen concentration (mg/l)
buffering system | replicate | 0 hours | 2 hours | 6 hours | 1 day | 4 days | 7 days |
air buffering |
1 |
8.01 |
8.01 |
8.00 |
8.05 |
7.83 |
7.91 |
|
2 |
8.03 |
8.03 |
8.06 |
7.82 |
7.96 |
|
|
3 |
|
8.00 |
8.00 |
7.92 |
7.85 |
7.92 |
mean |
|
|
8.01 |
8.01 |
8.01 |
7.83 |
7.93 |
sd |
|
|
0.02 |
0.02 |
0.08 |
0.02 |
0.03 |
HCl/NaOH buffering |
1 |
8.01 |
7.96 |
7.96 |
8.00 |
7.83 |
8.01 |
|
2 |
|
7.92 |
7.98 |
8.01 |
7.96 |
7.79 |
|
3 |
|
7.98 |
7.98 |
7.96 |
7.81 |
8.04 |
mean |
|
|
7.95 |
7.97 |
7.99 |
7.87 |
7.95 |
sd |
|
|
0.03 |
0.01 |
0.03 |
0.08 |
0.14 |
|
1 |
8.01 |
7.00 |
7.05 |
7.06 |
7.05 |
7.86 |
|
2 |
|
8.01 |
7.99 |
7.95 |
7.93 |
7.96 |
|
3 |
|
8.03 |
8.02 |
7.93 |
7.92 |
7.95 |
mean |
|
|
8.01 |
7.99 |
7.95 |
7.93 |
7.92 |
sd | 0.02 | 0.04 |
0.02 |
0.02 |
0.06 |
Table 3 Acute transformation/dissolution test (7 days) : Cu2O, in modified ISO 6341 medium - mass loading : 1 mg.l-1 - different buffering systems. Mean (mg dissolved Cu.l-1); SD : standard deviation (mg dissolved Cu.l-1); C.V. : coefficient of variation (%).
Blank modified ISO 6341 medium : < 0.0025 mg Cu.l-1.
Table 3.1 Air buffering
time | test jar | dissolved Cu (mg.l-1) | mean per test jar | mean per sampling time | total SD | total CV |
2 hours | 1 | 0.0071 0.0079 |
0.0075 | 0.0064 | 0.0020 | 31 |
2 | 0.008 0.0077 |
0.0079 | ||||
3 | 0.004 0.0038 |
0.0039 | ||||
6 hours | 1 | 0.0095 0.0099 |
0.0097 | 0.0081 | 0.0021 | 26 |
2 | 0.0093 0.0093 |
0.0093 | ||||
3 | 0.0055 0.0053 |
0.0054 | ||||
1 day | 1 | 0.0291 0.0281 0.0303 |
0.0292 | 0.0345 | 0.0099 | 29 |
2 | 0.0478 0.0473 0.0476 |
0.0476 | ||||
3 | 0.0269 0.0267 0.0266 |
0.0267 | ||||
4 days | 1 | 0.084 0.0864 |
0.0852 | 0.100 | 0.0314 | 31 |
2 | 0.138 0.142 |
0.1400 |
|
|
|
|
|
3 |
0.0754 0.0741 |
00748 |
|
|
|
7 days |
1 |
0.154 |
0.1545 |
0.1707 |
0.0532 |
31 |
|
2 |
0.155 |
0.2365 |
|
|
|
|
3 |
0.234 |
0.1210 |
|
|
|
Table 3.2 HCl/NaOH buffering
time |
test jar |
dissolved Cu (mg.l-1) |
mean per test jar |
mean per sampling time |
total SD |
total CV |
2 hours |
1 |
0.0061 0.0057 |
0.0059 |
0.0058 |
0.0005 |
9 |
|
2 |
0.0051 0.0053 |
0.0052 |
|
|
|
|
3 |
0.0061 0.0064 |
0.0063 |
|
|
|
6 hours |
1 |
0.0083 0.0093 |
0.0088 |
0.0082 |
0.0019 |
24 |
|
2 |
0.0062 0.0056 |
0.0059 |
|
|
|
|
3 |
0.0091 0.0106 |
0.0099 |
|
|
|
1 day |
1 |
0.0342 0.0343 0.0347 |
0.0344 |
0.0322 |
0.0023 |
7 |
|
2 |
0.0331 0.0328 0.0331 |
0.0330 |
|
|
|
|
3 |
0.0289 0.0289 0.03 |
0.0293 |
|
|
|
4 days |
1 |
0.16 0.164 |
0.1620 |
0.1438 |
0.0162 |
11 |
|
2 |
0.142 0.145 |
0.1435 |
|
|
|
|
3 |
0.127 0.125 |
0.1260 |
|
|
|
7 days |
1 |
0.274 0.263 |
0.2685 |
0.2317 |
0.0331 |
14 |
|
2 |
0.233 0.23 |
0.2315 |
|
|
|
|
3 |
0.194 0.196 |
0.1950 |
|
|
|
MOP buffering
time |
test jar |
dissolved Cu (mg.l-1) |
mean per test jar |
mean per sampling time |
total SD |
total CV |
2 hours |
1 |
0.0098 0.0096 |
0.0097 |
0.0102 |
0.0006 |
6 |
|
2 |
0.0105 0.0099 |
0.0102 |
|
|
|
|
3 |
0.0111 0.0105 |
0.0108 |
|
|
|
6 hours |
1 |
0.0138 0.0126 |
0.0132 |
0.0148 |
0.0015 |
10 |
|
2 |
0.0168 0.0152 |
0.0160 |
|
|
|
|
3 |
0.016 0.0141 |
0.0151 |
|
|
|
1 day |
1 |
0.0548 0.0549 0.0544 |
0.0547 |
0.0640 |
0.0700 |
11 |
|
2 |
0.0673 0.069 0.068 |
0.0681 |
|
|
|
|
3 |
0.0693 0.0693 0.0688 |
0.0691 |
|
|
|
4 days |
1 |
0.179 0.185 |
0.1820 |
0.2088 |
0.0213 |
10 |
|
2 |
0.228 0.226 |
0.2270 |
|
|
|
|
3 |
0.217 0.218 |
0.2175 |
|
|
|
7 days |
1 |
0.32 0.323 |
0.3215 |
0.3610 |
0.0311 |
9 |
|
2 |
0.386 0.388 |
0.3870 |
|
|
|
|
3 |
0.375 0.374 |
0.3745 |
|
|
|
Table 4 Results of the pH, temperature and dissolved oxygen measurements during the acute transformation/dissolution test (7 days) : Cu2O powder, in modified ISO 6341 medium - mass loading : 1 mg.l-1 - different buffering systems.
Table 4.1 pH
buffering system | replicate | 0 hours | 2 hours | 6 hours | 1 day | 4 days | 7 days |
air buffering | 1 | 6.00 | 6.05 | 6.06 | 6.30 | 6.17 | 6.39 |
2 | 6.04 | 6.07 | 6.28 | 6.16 | 6.59 | ||
3 | 6.04 | 6.05 | 6.31 | 6.19 | 6.65 | ||
mean | 6.04 | 6.06 | 6.30 | 6.17 | 6.54 | ||
sd | 0.01 | 0.01 | 0.02 | 0.02 | 0.14 | ||
HCl/NaOH buffering |
1 |
6.00 |
6.03 |
6.04 |
6.38 |
5.97 |
6.08 |
|
2 |
|
6.04 |
6.04 |
6.27 |
6.05 |
6.15 |
|
3 |
|
6.03 |
6.03 |
6.30 |
6.03 |
6.25 |
mean |
|
|
6.03 |
6.04 |
6.32 |
6.02 |
6.16 |
sd |
|
|
0.01 |
0.01 |
0.06 |
0.04 |
0.09 |
MOP buffering |
1 |
6.00 |
6.00 |
6.01 |
5.99 |
6.02 |
6.04 |
|
2 |
|
6.00 |
6.00 |
6.01 |
6.00 |
6.04 |
|
3 |
|
6.00 |
6.00 |
6.00 |
6.01 |
6.03 |
mean |
|
|
6.00 |
6.00 |
6.00 |
6.01 |
6.03 |
sd |
|
|
0.0 |
0.01 |
0.01 |
0.01 |
0.01 |
Table 4.2 Temperature (°C)
buffering system | replicate | 0 hours | 2 hours | 6 hours | 1 day | 4 days | 7 days |
air buffering | 1 | 22.0 | 21.8 | 21.8 | 21,7 | 21.7 | 21.8 |
2 | 21.8 | 21.8 | 21.7 | 21.7 | 21.8 | ||
3 | 21.8 | 21.8 | 21.7 | 21.7 | 21.8 | ||
mean | 21.8 | 21.8 | 21.7 | 21.7 | 21.8 | ||
sd | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||
HCl/NaOH buffering |
1 |
22.0 |
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
2 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
3 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
mean |
|
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
sd |
|
|
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
MOP buffering |
1 |
22.0 |
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
|
2 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.8 |
|
3 |
|
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
mean |
|
|
21.8 |
21.8 |
21.7 |
21.7 |
21.7 |
sd |
|
|
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
Table 4.3 Dissolved oxygen concentration (mg/l)
buffering system | replicate | 0 hours | 2 hours | 6 hours | 1 day | 4 days | 7 days |
air buffering | 1 | 8.03 | 8.01 | 7.96 | 7.89 | 7.93 | 7.83 |
2 | 7.96 | 7.97 | 7.93 | 7.92 | 7.85 | ||
3 | 7.95 | 7.95 | 7.99 | 7.99 | 8.03 | ||
mean | 7.97 | 7.96 | 7.94 | 7.95 | 7.90 | ||
sd | 0.03 | 0.01 | 0.05 | 0.04 | 0.11 | ||
HCl/NaOH buffering |
1 |
8.03 |
7.93 |
7.89 |
7.97 |
8.03 |
7.96 |
|
2 |
|
8.00 |
7.93 |
7.98 |
7.91 |
7.92 |
|
3 |
|
8.02 |
7.99 |
8.01 |
7.90 |
7.83 |
mean |
|
|
7.98 |
7.94 |
7.99 |
7.95 |
7.90 |
sd |
|
|
0.05 |
0.05 |
0.02 |
0.07 |
0.07 |
MOP buffering |
1 |
8.03 |
8.01 |
8.01 |
7.93 |
8.00 |
8.12 |
|
2 |
7.96 |
8.00 |
7.95 |
7.89 |
8.03 |
|
|
3 |
|
7.95 |
7.93 |
8.04 |
7.92 |
7.85 |
mean |
|
|
7.97 |
7.98 |
7.97 |
7.94 |
8.00 |
sd |
|
|
0.03 |
0.04 |
0.06 |
0.06 |
0.14 |
Applicant's summary and conclusion
- Conclusions:
- Refer to Executive summary
- Executive summary:
The mean measured Cu concentrations after a 7 days transformation/dissolution test with different buffering systems are:
medium buffering system initial pH pH after 7 days measured Cu conc.
after 7 days (mg.l-1)
Swedish water 2
air buffering
6.21
6.19
0.1013
HCl/NaOH buffering
6.21
6.09
0.1222
MOP buffering
6.21
6.12
0.1308
modified ISO 6341
air buffering
6.00
6.54
0.1707
HCl/NaOH buffering
6.00
6.16
0.2313
MOP buffering
6.00
6.03
0.3610
The mean dissolved Cu concentrations after 7 days in the natural and artificial media are : Swedish water 2 (Brattfors) : 0.118 +/- 0.020 mg Cu/l; modified ISO 6341 medium : 0.254 +/- 0.090 mg Cu/l.
A linear increase of dissolved Cu was demonstrated over the test period of 7 days. The dissolution kinetic can be described by the following equation
medium buffering sytem equation R2 Swedish water air buffering
mg Cu/l = 0.0138 * time + 0.0039
0.993
HCl/NaOH buffering
mg Cu/l = 0.0169 * time + 0.0012
0.996
MOP buffering
mg Cu/l = 0.0182 * time + 0.0030
0.998
modified ISO 6341
air buffering
mg Cu/l = 0.0239 * time + 0.0041
0.997
HCl/NaOH buffering
mg Cu/l = 0.0335 * time + 0.0014
0.998
MOP buffering
mg Cu/l = 0.0510 * time + 0.0050
0.999
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