Sensitive method for titanium determination in soil extract using adsorptive stripping voltammetry
Year: 2025
Type: article
Abstract: Wide application of TiO 2 results in contamination of the environment, and may cause adverse changes in the soil. Monitoring of soil for pollution with both solid and ionic (mobile) forms of Ti seems to be a need. Therefore, it is necessary to develop an alternative method to ICP-MS for determining ionic Ti at low concentration. Electrochemistry is particularly promising, as only the ionic form is determined, and with high precision. Adsorptive stripping voltammetry with differential pulse mode, utilizing complexation with mandelic acid supported by the catalytic effect of chlorate (V) ions, is presented here for determination of Ti in unmodified extract of soil rich in organic matter. The proposed procedure allows to detect 0.01 ng mL −1 in voltammetric cell, which gives 3 ng mL −1 for peat soil extracts (t d = 240 s) with precision <1.5%. The studies indicated that 0.3 ng of Ti(IV) in cell is quantified with 100–101% recovery. The procedure optimized for such a challenging matrix can be included in complex studies of the content of ionic and solid forms of titanium compounds in soils. • DP AdSV after complexation with mandelic acid lets for Ti study in soil extract. • Ionic Ti can be determined despite strong matrix effects from unmodified extract. • The LOD equals 0.004 ng mL −1 Ti in voltammetric cell (1.2 ng mL −1 in soil extract). • The recovery of Ti(IV) at 0.03 ppb level in voltammetric cell was 100 %. • AdSV and ICP-MS provide complementary data in the study of Ti speciation.
Source: Talanta
Institution: University of Warsaw
Language: English
Subfield: Electrochemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,610
OpenAlex ID: W4407134654