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EC number: 213-384-1
CAS number: 941-98-0
Adsorption / desorption
The adsorption coefficient Koc in soil
and in sewage sludge of test chemical was determined by the Reverse
Phase High Performance Liquid Chromatographic method according to OECD
Guideline No. 121 for testing of Chemicals (Experimental study report,
2017). The solutions of the test substance and reference substances were
prepared in appropriate solvents. A test item solution was prepared by
accurately measuring 5μL of test item and diluted with acetonitrile up
to 10 ml. Thus, the test solution concentration was 560 mg/l. The pH of
test substance was 6.0. 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 structural similarity with
the test substance and the calibration graph was prepared. The reference
substances were 4 -nitrophenol, 2-nitrophenol, nitrobenzene, 1-naphthol,
naphthalene, phenol and phenanthrene having Koc value ranging from 1.32
to 4.09. The Log Koc value of test chemical was determined to be 2.9046
± 0.0005 at 25°C. This log Koc value indicates that the test chemical
has a moderate sorption to soil and sediment and therefore have slow
migration potential to ground water.
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