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Environmental fate & pathways

Biodegradation in soil

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Endpoint:
biodegradation in soil: simulation testing
Data waiving:
other justification
Justification for data waiving:
other:
Endpoint:
biodegradation in soil: simulation testing
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2015
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Guideline:
ISO/DIS 17556.2 (Plastics - Determination of the Ultimate Aerobic Biodegradability in Soil by Measuring the Oxygen Demand in a Respirometer or the Amount of Carbon Dioxide Evolved)
Version / remarks:
ASTMD5988 e ISO17556
GLP compliance:
no
Remarks:
The test is performed in accordance to the ISO/IEC 17025 “General requirements for the competence of testing and calibration laboratories”.
Test type:
laboratory
Specific details on test material used for the study:
Two different batches of TMP Carboxylic Acids, C5-9 were tested
Radiolabelling:
no
Oxygen conditions:
aerobic
Soil classification:
not specified
Year:
2015
Soil no.:
#1
Soil type:
other: Natural soil from the CERSAA of Albenga, additivated with compost (4%) and mineral salts.
Details on soil characteristics:
Natural soil from the CERSAA (CENTRO DI SPERIMENTAZIONE E ASSISTENZA AGRICOLA) of Albenga, additivated with compost (4%) and mineral salts.
Soil No.:
#1
Duration:
ca. 65 d
Soil No.:
#1
Initial conc.:
2 g/kg soil d.w.
Based on:
test mat.
Soil No.:
#1
Initial conc.:
1 g/kg soil d.w.
Based on:
test mat.
Parameter followed for biodegradation estimation:
CO2 evolution
Soil No.:
#1
Temp.:
28 °C
Soil No.:
#1
% Degr.:
80.07
St. dev.:
5.68
Parameter:
CO2 evolution
Remarks:
Batch RIC1683 0,2g
Sampling time:
65 d
Soil No.:
#1
% Degr.:
81.34
St. dev.:
3.13
Parameter:
CO2 evolution
Remarks:
ALTMP01-2015DF 0,2g
Sampling time:
65 d
Soil No.:
#1
% Degr.:
74.58
St. dev.:
5.63
Parameter:
CO2 evolution
Remarks:
ALTMP01-2015DF 0,1g
Sampling time:
65 d
Transformation products:
not specified
Evaporation of parent compound:
not measured
Volatile metabolites:
not measured
Residues:
not measured
Results with reference substance:
The % of biodegradation of cellulose was 66,58% (±4,30)

  R3 R4     R5 R6     R7 R8     R9 R10
Time %Biodegradation %Biodegradation Mean Standard Deviation %Biodegradation %Biodegradation Mean Standard Deviation %Biodegradation %Biodegradation Mean Standard Deviation %Biodegradation %Biodegradation   Mean  Standard Deviation
Days RIC1683 0,2 g RIC1683 0,2 g     ALTMP01-2015 DF 0,2 g ALTMP01-2015 DF 0,2 g     Cellulose Cellulose     ALTMP01-2015 DF 0,1 g ALTMP01-2015 DF 0,1 g    
0,00 0 0     0 0     0 0     0 0    
5,00 39,58336 39,57528 39,57932 0,005716 42,2863 42,95283 42,61957 0,471311 9,057402 13,82637 11,44189 3,372171 44,61782 44,50285 44,56034 0,081302
7,00 45,6156 45,48955 45,55257 0,089134 49,27459 49,74988 49,51223 0,336076 36,25053 40,5788 38,41466 3,060548 53,96076 53,98138 53,97107 0,014577
9,00 53,31058 53,05226 53,18142 0,182654 58,30233 58,09734 58,19983 0,144949 46,22831 45,35908 45,79369 0,614643 63,75492 61,91097 62,83294 1,303865
12,00 60,14196 57,78368 58,96282 1,667556 63,66477 62,78581 63,22529 0,621521 48,57111 46,51663 47,54387 1,452731 65,29438 63,06689 64,18063 1,57507
18,00 66,48355 62,41443 64,44899 2,877302 67,71513 67,00295 67,35904 0,503587 53,34036 51,23261 52,28648 1,490408 67,6832 64,63894 66,16107 2,152614
24,00 70,51793 65,3464 67,93216 3,656827 70,6388 69,69448 70,16664 0,667737 56,24793 53,44054 54,84424 1,985129 70,73558 67,71368 69,22463 2,136801
32,00 73,72739 68,00153 70,86446 4,048799 72,992 72,38601 72,68901 0,428503 59,36468 55,21975 57,29221 2,930914 74,15955 68,61485 71,3872 3,920694
45,00 79,46318 70,60632 75,03475 6,262743 76,68581 78,10396 77,39489 1,002778 64,36404 59,91428 62,13916 3,146451 77,90203 69,26264 73,58234 6,108972
65,00 84,09047 76,055 80,07274 5,681937 79,12459 83,54903 81,33681 3,128556 69,6144 63,53701 66,5757 4,297367 78,56559 70,60348 74,58453 5,630065
                                 
Conclusions:
The biodegradation of the two tested batches was very similar at both the tested concentrations:

RIC1683 0,2g 80,07% (±5,68)
ALTMP01-2015DF 0,2g 81,34% (±3,13)
ALTMP01-2015DF 0,1g 74,58% (±5,63)
Cellulose 0,2g 66,58% (±4,30)

In addition the tested item showed a higher biodegradation of the tested reference (cellulose).

Description of key information

According to Column 2 of Annex IX to the REACH Regulation the study does not need to be conducted if the substance is readily biodegradable. TMP PE is readily biodegradable (See section 5.2.1 of IUCLID for additional details).

Two studies are available, one on the target substance and one the analogue Trimethylolpropane Carboxylic Acids, C5 -9 .

Both of them demonstrates the high biodegradability of the target substance in soil ( 78.8% of biodegradation in 63 days with a DegT50 of only 7 days (Tosin, 2013).).

Key value for chemical safety assessment

Half-life in soil:
7 d
at the temperature of:
28 °C

Additional information