## 3 Results
### Degree of Complexation of Metal Ions in the Tested Products  
On the basis of the isotopic composition of zinc (64 Zn 48.6%; 66 Zn 27.9%; 67 Zn 4.1%; 68 Zn 18.8%), it was defined which of the signals in the mass spectrum systems of homogenates and filtrates enriched with zinc ions can be attributed to the complexes that are not present in the spectrum of the solution ZnSO4.7H2O--reference system. Figure 2 presents the mass spectrum of the complexation degree of metal ions in the tested products: ZnSO4.7H2O solution (C-H2O-Zn), H 10%, H 10%-Zn, F 100%, and  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \multirow{2}{*}{**Element**} & **Wavelength** & **Algal Biomass** & **F 100\%** & **F 100\%-Zn** & **H 10\%** & **H 10\%-Zn** \\ \cline{2-7}  & **(nm)** & **(mg/kg d.w.)** & & & **(mg/L)** & \\ \hline \multirow{8}{*}{Microelements} & B & 249.773 & \(97.8\pm 14.7\) & 2.67 \(\pm\) 0.40 & 1.28 \(\pm\) 0.19 & 5.18 \(\pm\) 0.78 & 3.88 \(\pm\) 0.58 \\  & Cu & 324.754 & \(12.7\pm 1.9\) & 2.86 \(\pm\) 0.43 & 1.70 \(\pm\) 0.25 & 1.40 \(\pm\) 0.21 & 1.14 \(\pm\) 0.17 \\  & Fe & 259.94 & \(3760\pm 560\) & 47.2 \(\pm\) 7.1 & 42.0 \(\pm\) 6.3 & 117 \(\pm\) 17 & 114 \(\pm\) 17 \\  & Mn & 257.61 & \(232\pm 35\) & 1.67 \(\pm\) 0.25 & 1.68 \(\pm\) 0.25 & 2.27 \(\pm\) 0.34 & 2.32 \(\pm\) 0.35 \\  & Si & 251.611 & \(906\pm 136\) & 97.7 \(\pm\) 14.7 & 87.5 \(\pm\) 13.1 & 50.6 \(\pm\) 7.6 & 69.5 \(\pm\) 10.4 \\  & Zn & 213.856 & \(64.9\pm 9.7\) & 2.27 \(\pm\) 0.34 & 9060 \(\pm\) 1810 & 3.55 \(\pm\) 0.53 & 9340 \(\pm\) 1870 \\ \hline \multirow{8}{*}{Macroelements} & Ca & 315.887 & 24,800 \(\pm\) 4950 & 619 \(\pm\) 93 & 656 \(\pm\) 98 & 608 \(\pm\) 91 & 651 \(\pm\) 98 \\  & K & 766.49 & 4150 \(\pm\) 830 & 64.5 \(\pm\) 97 & 552 \(\pm\) 83 & 713 \(\pm\) 107 & 309 \(\pm\) 4.6 \\  & Mg & 279.079 & 1880 \(\pm\) 280 & 236 \(\pm\) 35 & 243 \(\pm\) 36 & 190 \(\pm\) 28 & 199 \(\pm\) 30 \\  & Na & 588.995 & 6350 \(\pm\) 1270 & 136 \(\pm\) 20 & 119 \(\pm\) 18 & 98.3 \(\pm\) 14.7 & 86.0 \(\pm\) 12.9 \\  & P & 213.618 & 881 \(\pm\) 132 & 33.3 \(\pm\) 5.0 & 29.2 \(\pm\) 4.4 & 55.3 \(\pm\) 8.3 & 402 \(\pm\) 6.03 \\  & S & 182.034 & 6830 \(\pm\) 1370 & 208 \(\pm\) 31 & 4834 \(\pm\) 725 & 205 \(\pm\) 31 & 5070 \(\pm\) 1010 \\ \hline \multirow{8}{*}{Other elements} & Al & 308.215 & 1570 \(\pm\) 236 & 62.5 \(\pm\) 8.1 & 32.0 \(\pm\) 4.2 & 43.4 \(\pm\) 5.6 & 37.2 \(\pm\) 4.8 \\  & Ba & 455.403 & \(24.5\pm 3.7\) & 6.09 \(\pm\) 0.91 & 5.50 \(\pm\) 0.82 & 4.66 \(\pm\) 0.70 & 4.51 \(\pm\) 0.68 \\ \cline{1-1}  & Cd & 228.802 & 0.707 \(\pm\) 0.092 & \(\sim\) LOD & \(\sim\) LOD & 0.119 \(\pm\) 0.015 & 0.0498 \(\pm\) 0.0100 \\ \cline{1-1}  & Cr & 267.716 & \(9.59\pm 1.44\) & 0.585 \(\pm\) 0.088 & 0.50 \(\pm\) 0.075 & 1.05 \(\pm\) 0.16 & 1.03 \(\pm\) 0.15 \\ \cline{1-1}  & Ni & 231.604 & 5.23 \(\pm\) 0.78 & 0.790 \(\pm\) 0.118 & \(\sim\) LOD & 2.33 \(\pm\) 0.349 & \(\sim\) LOD \\ \cline{1-1}  & Pb & 220.353 & 7.03 \(\pm\) 0.91 & 0.522 \(\pm\) 0.068 & \(\sim\) LOD & 0.267 \(\pm\) 0.035 & \(\sim\) LOD \\ \hline \end{tabular}  
* where \(<\)LOD below limit of detection; d.w.: dry weight; F 100%: initial algal filtrate (without dilution); F 100%-Zn: initial algal filtrate (without dilution) enriched with Zn(II) ions; H 10%: 10-times diluted initial algal homogenate (H 100%); H 10%-Zn: 10-times diluted initial algal homogenate (H 100%); H 10%-Zn: 10-times diluted initial algal homogenate (H 100%) enriched with Zn(II) ions.  
\end{table}
Table 1: The multi-elemental composition (\(N=3\)) of the algal biomass, algal filtrate and homogenate (average \(\pm\) standard deviation; SD).  
F 100%-Zn. It was found that in homogenate (H 10%-Zn), 45% of Zn(II) ions were complexed with the compounds that are present in the examined homogenate and in the filtrate (F 100%-Zn)--35% of Zn(II) ions.  
Figure 2: _Cont._