This research was funded by the RFBR (project 19-53-26001), by the Czech Science Foundation (project GACR 20-01417)), and the Russian State assignment \"Science\" FSWW-2020-0022. We appreciate efficient material, technical and intellectual support of Metrohm.CZ ([[https://www.metrohm.com/cs-cz/](https://www.metrohm.com/cs-cz/)]([https://www.metrohm.com/cs-cz/](https://www.metrohm.com/cs-cz/)) (accessed on 8 November 2021)). ## References  
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* 1.2.27. M. Adamczyk
* and M. Grabarczyk
* Department of Analytical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, 20031 Lublin, Poland
* Correspondence: marzena.adamczyk@poczta.umcs.lublin.pl  
Both nettle and horsetail are very popular weeds found almost all over the globe. Among the wide range of applications, the most frequently mentioned is their use in cosmetics, improving the health condition of hair and nails. In addition to various biologically active ingredients with pro-health properties, these weeds are also characterized by a high content of titanium, which plays a key role in plant cultivation. Figure 30: Chemical structure of rivaroxaban. This work describes the determination of titanium content in the dried leaves of nettle, as well as horsetail, commercially available by three different producers (A, B, and C) using the adsorptive stripping voltammetry method. In the voltammetric procedure, mercury film silver based electrode (Hg(Ag)FE) and chloranilic acid were used as a working electrode and a complexing agent, accordingly. The voltammetric analysis was preceded by the preparation of extracts from all tested plant materials by high pressure microwave-assisted mineralization. The standard adsorptive voltammetric measurements were run in a solution containing 0.1 mol L\({}^{-1}\) acetate buffer pH = 4.2 and 1 \(\times\) 10\({}^{-3}\) mol L\({}^{-1}\) chloranilic acid. The measurements were performed by differential pulse adsorptive stripping voltammetry from deaerated solutions. The accumulation of the complexes Ti(IV)-chloranilic acid onto the Hg(Ag)FE electrode were conducted at the potential of \(-\)0.3 V for 30 s while stirring the solution. At the end of accumulation time, the stirrer was switched off, and, after the equilibration time of 5 s, a differential pulse voltammogram was recorded, while the potential was scanned from \(-\)0.4 V to \(-\)0.9 V. The scan rate and pulse height were 20 mV s\({}^{-1}\) and \(-\)50 mV, respectively. The titanium peak appeared at \(-\)0.6 V [1]. The developed procedure turned out to be a simple and fast tool for the determination of titanium in the prepared extracts. The sample matrix did not interfere with the determination of titanium. All determinations were carried out by the standard addition method. The obtained results confirmed that both nettle and horsetail are rich in titanium.