Solid-phase extraction and fluorimetric determination of Zn(II) in natural water using novel adsorbent based on silica modified with polyhexamethylene guanidine and Ferron

ABSTRACT

Novel silica-based adsorbent layer-by-layer modified with polyhexamethylene guanidine and 7-iodine-8-hydroxyquinoline-5-sulphonic acid (Ferron) was used for preconcentration and adsorption-fluorimetric determination of Zn(II). A simple and express method for adsorbent preparation is described in the present work. The prepared adsorbent extracts Zn(II) from solutions with pH of 5.0–7.0, with the formation of a luminescent complex λ_lum = 500 nm (λ_ex = 380 nm) on the surface. An adsorption-fluorimetric method was developed for determination of Zn(II) in natural water using adsorbent sequentially modified with polyhexamethylene guanidine and Ferron; detection limit was 4 µg L⁻¹. The procedure was used for the analysis of water from rivers and artesian wells of the Krasnoyarsk Krai (Russia).

KEYWORDS:

• Adsorption
• modified silica
• luminescent determination
• Zn(II)

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The reported research was funded by Russian Foundation for Basic Research and the government of Krasnoyarsk region of the Russian Federation [grant № 18-43-243004].