2. Materials and methods
2.1. Sample preparation
Water hyacinth plant was collected from agriculture wastewater drainage. The plant was washed carefully with tap water to get rid of any contamination, then it was divided into two parts namely root (R) and shoot (S). Both parts were dried at 105 °C for 24 h. The dried samples were cut into small pieces and then ground in a hardened steel vial containing two hardened steel balls. The vial was fitted to an aspex-mixer mill which was rotated several times for short periods. The obtained powder was then sieved to different particle sizes to be ready for the different measurements. Some of them were pressed.