FIELD: chemistry.
SUBSTANCE: to identify zinc (II) pH medium is varied for its selective extraction on sorbent, modified with 8-hydroxy-7-iodine-5-sulfo quinoline, immobilised due to non-covalent fixation on the surface of silicageldine, preliminarily processed with polyhexamethylene guanidine. Intensity of luminescence of surface zinc (II) surface complexes is detected at wavelength 500 nm. Content of zinc (II) is determined by calibration curve. Used sorbent undergoes regeneration, after which it does not its sorption capacity.
EFFECT: reduction of detection limits, extension of the range of detected contents, increased method sensitivity, creation of novel selective sorbent, suitable for repeated exploitation.
2 tbl, 2 dwg
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