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EC number: 200-929-3
CAS number: 76-05-1
Two tests using the batch equilibrium methodology, one according to OECD guideline 106 and one not according to the guidelines but of of good quality were performed on 54 different soil samples. The results show that TFA is poorly absorbed to the soil and is considered as a mobile organic compound in the majority of soils investigated. The Kd ranged between 0.19 to 20 L/kg for organic and mineral soils (the organic horizon exhibiting greater retention) giving a geometric mean of 0.94 L/kg (SD=4.86, n= 20) at 25°C. Based on these results no further information on adsorption/desortion is required according to column 2 of REACH Annex IX.
An adsorption screening test carried out according to OECD guideline 106
with three soil types (humous acid sandy soil, sandy loam with a low
organic matter content, slightly alkaline loamy soil). The
soil/water-system consisted of about 2 g soil and about 10 mL 0.01 M
Ca(CH3COO)2 solution spiked with NaTFA (sodium trifluoroacetate) on a
level of about 5 mg/L. Six blanks (without NaTFA), three controls
(without soil) and six test soil (two replicates per soil) were
performed during the test. The conclusion drawn from these results is
that the TFA-anion poorly adsorbs to the different soil components
because after 16 hours of agitating in a soil/water system less than 3%
of the initial amount of TFA had disappeared from the water phase. Due
to the fact that less than 25% is adsorbed, no further testing is
required by the OECD guidelines.
Another batch equilibrium study not performed according to standard
guideline but scientifically acceptable and well documented is reported.
TFA was retained by 34 of 54 soils collected from diverse locations and
a subset of 12 soils were chosen as representative of the TFA retention
characteristics found in this study. Organic soils that exhibited higher
retention of TFA sorbed between 20 and 60% of added TFA. In contrast,
mineral soils retained 0 -15% of added TFA. Classifying mobility of TFA
on the basis of Kd values suggests that TFA would be considered immobile
(Kd> 10) in only 3 of 54 soils studied characterized by elevated organic
matter content (> 70%). Eight soils exhibited low TFA mobility (Kd=2
-10), 15 soils intermediate mobillity (Kd=0.5 -2) and TFA should be
considered as mobile in eight of soils (Kd=0.1 -0.5). No significant TFA
retention was found in 20 of the soils studied. The retention of TFA
increased with decreasing pH and decreased with increasing
concentrations of F-, Cl-, and SO42 -. It is expected that rates of TFA
leaching from soils will depend on soil types, organic content, soil pH,
inputs of competing anions and atmospheric deposition rates of TFA. TFA
was considered as a mobile organic compound in soils at the majority of
sites investigated and measured Kd value ranged between 0.17 to 20 L/kg
for all soil locations. An average Kd of 0.94 L/kg at 25°C (SD= 4.86, n=
20) based on the geometric mean of reported values for representitive
soils retaining TFA was calculated.
A Koc is needed for the exposure assessment of the sediment.
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