FIELD: medicine.
SUBSTANCE: blood is sampled, acidified to pH 2-3 with aqueous oxalic acid, extracted in toluene for 5 min; the prepared extract is centrifuged for 60 min at 7,000 rpm, added with sodium sulphate to dewater and acetylated for 3 hours by introducing trifluoroacetic anhydride while stirring continuously in the pyridine medium. The blood sample, toluene, trifluoroacetic anhydride and pyridine are taken in volume ratio 5:2.5:0.2:0.1 respectively.
EFFECT: simplifying the stage of sample preparation and increasing the sensitivity of pentachlorophenol test.
3 cl, 4 tbl, 1 ex
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RU2813866C1 |
