To establish the possibility of new solid-phase reagents application to analytical practice, reagent desorption from H2Dz-SG and H2Dz-SP surfaces as a function of solution pH was studied.
The data obtained has shown that H2Dz desorption at pH 0–9 was less than or equal to 5% (sorbent mass]0.01 g, aqueous solution volume5100 ml, time of phases contact560 min).
Zinc dithizonate immobilized on the surface was found to be destroyed when contacted with an aqueous solution at pHB3.5.
The loss of Zn(II) into solution under these conditions was confirmed by FAAS.
The desorption of dithizone remaining on the surface at pHB3.5 was similar to that from H2Dz-SP surface.
So, Zn(HDz)2-SP at pH 0–3.5 may be applied to determine the metal ions forming more stable complexes with
H2Dz than Zn(II).