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EC number: 271-974-4
CAS number: 68647-86-9
Charcoal, coconut shell is not a Ready
According to REACH annex VII, this
study does not need to be conducted if the substance is inorganic.
Charcoal, coconut shell consists largely of elemental carbon, and can
thus be considered to be (or behave as) an inorganic substance.
Moreover, as per REACH Annex XI 1.2,
lab testing of the Ready Biodegradability of Charcoal, coconut shell
does not appear scientifically necessary, as there is ample evidence
that the substance is not significantly biodegraded in the environment.
biodegradability of charcoal (Probe 2: C-Fix = 80.5%) was tested
according to OECD guideline No. 301B (CO2evolution test) and
under GLP compliance.
The test item was
tested in a concentration of 25 mg/L. As positive control, aniline was
tested in parallel. The biodegradation of the test substance was
determined by measuring the emitted CO2concentrations on test
days 2, 4, 7, 9, 11, 14, 18, 23, during the 28-day test period and on
day 29. The biodegradation for the whole test period was determined as
<2%. Hence, charcoal (Probe 2: C-Fix = 80.5%) is considered not readily
biodegradable. For the positive control, a degradation of 64% was
achieved within 9 d, ensuring the validity of the test.
This test was not
conducted with “Charcoal, coconut shell” but due to the Read-across
approach the test results for “Charcoal” can be used:
coefficient KOCof charcoal (Probe 2: C-Fix = 80.5%) was
determined using the HPLC method in accordance with the OECD guideline
121 and in compliance with GLP standards.
The study was
performed using HPLC with a cyanopropyl chemical bound resin on a silica
based column as stationary phase (pH = 5.5; 25 °C). As mobile phase
methanol/water (55/45%, v/v) was used. Seven reference items with
different retention times (tR) were chosen for the
calibration on behalf of the retention time of the test item charcoal
(Probe 2: C-Fix =80.5%) on the column.
First, a solution
of the reference items was measured three times with HPLC, then a
solution of the test item (three measurements), and finally the solution
of the reference items was again measured three times.
reference item, the capacity factor k’ was calculated from the retention
time of an unretained compound (sodium nitrate) and the retention time
of the respective reference item. A calibration function was set up
using the literature values for KOCof the reference items and
the mean capacity factor of the six determinations. Based on the data
set log k’ versus log KOC,the equation for the
regression line was calculated.
of the test item showed one peak (mean tR= 2.254 min). The
log KOCwas calculated as 0.661±0.026, with a range of
0.633–0.686. As this log KOCvalue lies outside the
calibration range obtained with the used reference substances
(1.32-5.63) and also outside the determinable log KOCrange of
the HPLC screening method (according to OECD guideline 121: 1.5-5.0), the
log KOCof the test item charcoal (Probe 2: C-Fix = 80.5%)
should be stated as < 1.5.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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