## 3 Results and Discussion
### Chemical Composition of Raw Materials
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**Element** & **Raspberry** & **Sea-** & **Sea-** & **Grape Vine** & **Grape Vine** & **Almond** & **Pistachio** & **Almond** & **Peach Sione** & **Plum Stone** & **Date Stone** & **Limit Value** \\
**(mg-kg\({}^{-1}\))** & **Pomace** & **Pomace** & **Pomace** & **Seed Case** & **Shell** & **Shell** & **Seed Coat** & **Peach Sione** & **Plum Stone** & **Date Stone** & **ISO 1725+6** \\ \hline Mo & \(12.7\pm 1.2\) & \(9.2\pm 1.3\) & \(9.4\pm 1.1\) & \(10.6\pm 1.2\) & \(10.3\pm 1.1\) & \(125\pm 1.1\) & \(11\pm 1.1\) & \(12.5\pm 1.1\) & \(11\pm 1.1\) & \(10.6\pm 1.1\) \\ Zr & \(116.5\pm 1.0\) & \(113.1\pm 1.1\) & \(6.7\pm 0.9\) & \(9.4\pm 1.0\) & \(9.8\pm 0.9\) & \(8.9\pm 0.8\) & \(9.5\pm 0.9\) & \(113.3\pm 0.8\) & \(10.1\pm 0.7\) & \(10.1\pm 0.8\) \\ Sr & \(30.3\pm 1.0\) & \(113.3\pm 1.3\) & \(20.7\pm 0.8\) & \(23.9\pm 0.9\) & \(16.9\pm 0.8\) & \(6.6\pm 0.5\) & \(173.7\pm 0.8\) & \(8.0\pm 0.5\) & \(10.4\pm 0.5\) & \(10.1\pm 0.6\) \\ U & \(56.6\pm 1.7\) & ND & ND & ND & ND & ND & ND & \(6.5\pm 1.3\) & ND & \(3.1\pm 2.5\) \\ Rb & \(12.4\pm 0.9\) & \(9.3\pm 1.1\) & \(5.6\pm 0.6\) & \(6.3\pm 0.8\) & \(4.0\pm 0.7\) & \(3.3\pm 0.6\) & \(4.4\pm 0.6\) & \(1.9\pm 0.5\) & \(13.3\pm 0.5\) & \(51.0\pm 0.6\) \\ Zn & \(43.5\pm 4.1\) & \(58.9\pm 9.1\) & \(12.3\pm 3.0\) & ND & ND & \(7\pm 3\) & \(7.2\pm 2.5\) & \(11\pm 2.4\) & \(19\pm 3.3\) & \(100\) \\ W & \(216.6\pm 26\) & \(427\pm 36\) & ND & ND & ND & \(140\pm 20\) & \(197\pm 20\) & \(195\pm 23\) & \(81\pm 18\) & \(180\pm 18\) & \(76\pm 17\) \\ Cu & \(81\pm 7\) & \(35\pm 13\) & \(28.2\pm 4.3\) & \(30\pm 5\) & \(22\pm 5\) & \(19\pm 5\) & \(28\pm 6\) & \(17\pm 5\) & \(29\pm 5\) & \(14\pm 4\) & \(20\) \\ Fe & \(172\pm 33\) & \(300\pm 70\) & \(608\pm 17\) & \(560\pm 20\) & \(50\pm 19\) & \(140\pm 12\) & \(319\pm 17\) & \(980\pm 21\) & \(110\pm 11\) & \(513\pm 16\) \\ Ti & \(400\pm 260\) & \(50.3\pm 31\) & \(473\pm 250\) & \(219\pm 260\) & \(216\pm 12\) & \(115\pm 17\) & \(220\pm 19\) & \(76\pm 15\) & \(253\pm 17\) \\ Ca & \(5300.700\pm 500\) & \(520.500\pm 500\) & \(3460.600\pm 300\) & \(27900\pm 300\) & \(30400\pm 400\) & \(5960\pm 70\) & \(1300\pm 300\) & \(23400\pm 300\) & \(6530\pm 80\) & \(20800\pm 300\) \\ K & \(46,300\pm 300\) & \(41,900\pm 300\) & \(230.2\pm 130\) & \(1140\pm 310\) & \(7450\pm 400\) & \(7000\pm 100\) & \(70,600\pm 120\) & \(1100\pm 130\) & \(14000\pm 150\) \\ S & \(5300\pm 110\) & \(1000\pm 160\) & \(4280\pm 50\) & \(450\pm 60\) & \(1600\pm 80\) & \(1750\pm 90\) & \(1330\pm 80\) & \(2307\pm 70\) & \(2440\pm 70\) & \(3010\pm 70\) & \(3000\) \\ Sb & ND & \(11\pm 7\) & ND & ND & ND & ND & ND & \(6.4\pm 3\) & ND & ND \\  & \(15\pm 5\) & \(9\pm 6\) & ND & ND & ND & ND & \(8\pm 4\) & \(7.4\pm 6\) & \(6.3\pm 5\pm 4\) & \\ Cd & \(25\pm 3\) & \(23\pm 4\) & ND & ND & ND & ND & \(17\pm 3\) & \(25\pm 3\) & \(17\pm 2\) & \(19\pm 2\) & \(0.5\) \\ Ag & \(8.4\pm 1.7\) & \(104\pm 21\) & ND & ND & ND & \(3.6\pm 1.3\) & \(9.1\pm 1.3\) & \(3.7\pm 1.1\) & \(62\pm 1.2\) & \\ Pd & \(17.1\pm 2.1\) & \(142\pm 24\) & ND & ND & ND & ND & \(7.1\pm 1.5\) & \(15.3\pm 1.6\) & \(8.1\pm 1.2\) & \(102\pm 1.3\) & \\ Nb & \(16.5\pm 1.3\) & \(16.1\pm 1.6\) & \(11.4\pm 1.7\) & \(12.1\pm 1.2\) & \(12.7\pm 1.1\) & \(13.6\pm 1.1\) & \(14.1\pm 1.2\) & \(15.3\pm 1.1\) & \(14.4\pm 1.1\) & \(128\pm 1.1\) \\ Al & \(7000\pm 5 Samples originating from pomace (grape vine pomace and seed cake and raspberry pomace) have high sulphur concentrations. In addition, higher Cl concentrations can be seen in samples of materials originally from seeds (peach, plum and sea-buckthorn pomace, which also contains seeds). However, the excess is not significant, and these samples meet the limit for class B (biofuel pellets). Only the pistachio shell and date stone sample exceeds the Cl limit.