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EC number: 260-135-8
CAS number: 56375-79-2
Adsorption / desorption
The adsorption coefficient Koc in soil
and in sewage sludge of test chemical Tributylmethylammonium chloride
(CAS No. 56375-79-2) was determined by the Reverse Phase High
Performance Liquid Chromatographic method according to OECD Guideline
No. 121 for testing of Chemicals (Experimental study report, 2018). The
solutions of the test substance and reference substances were prepared
in appropriate solvents. A test item solution was prepared by accurately
pipetting 4 microliter of test item and diluted with Acetonitrile up to
10 ml. Thus, the test solution concentration was 389.2 mg/l. The pH of
test substance was 4.2.Each of the reference substance and test
substance were analysed by HPLC at 210 nm. After equilibration of the
HPLC system, Urea was injected first, the reference substances were
injected in duplicate, followed by the test chemical solution in
duplicate. Reference substances were injected again after test sample,
no change in retention time of reference substances was observed.
Retention time tR were measured, averaged and the decimal logarithms of
the capacity factors k were calculated. The graph was plotted between
log Koc versus log k(Annex - 2).The linear regression parameter of the
relationship log Koc vs log k were also calculated from the data
obtained with calibration samples and therewith, log Koc of the test
substance was determined from its measured capacity factor. The
reference substances were chosen according to estimated Koc range of the
test substance and generalized calibration graph was prepared. The
reference substances were Acetanilide, 4-chloroaniline,
4-methylaniline(p-Tolouidine), N-methylaniline, ptoluamide, Aniline,
2,5-Dichloroaniline, 4-nitrophenol, 2 - nitrophenol, 2-nitrobenzamide,
3-nitrobenzamide, Nitrobenzene, 4 -Nitrobenzamide, 1-naphtol, Direct Red
81, Benzoic acid methylester, Carbendazim, Benzoic acid phenylester,
Xylene, Ethylbenzene, Toluene, Naphthalene, 1,2,3-trichlorobenzene,
Pentachlorophenol, 3,5 -dinitrobenzamide, Benzamide, phenanthrene having
Koc value ranging from 1.25 to 4.09. The Log Koc value of test chemical
Tributylmethylammonium chloride was determined to be 1.104± 0.005 at
25°C. This log Koc value indicates that the substance
Tributylmethylammonium chloride has a negligible sorption to soil and
sediment and therefore have rapid migration potential to ground water.
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