Then 25 ml of the heavy metal solution were added keeping the column close until complete matrix humidification. After that, the column was open to allow water flow and pressure was applied on the top of the column using a syringe.
Then 25 ml of the heavymetal solution were added keeping the column close until completematrix humidification. After that, the column was open to allowwater flow and pressure was applied on the top of the columnusing a syringe.