The solid-liquid ratio in batch sorption experiments - a parameter which needs more attention

The solid-liquid (S/L) ratio is an important but often overlooked factor in batch sorption experiments for radionuclides. Typically, a single S/L ratio is chosen based on expected sorption behaviour and analytical constraints. It is generally assumed that S/L does not influence sorption, but recent studies have shown that even small variations in S/L can significantly affect sorption for some materials, such as clays and cements, under certain conditions. Understanding why S/L affects sorption is essential for accurate interpretation of sorption data and improving experimental methodologies.