AMI SAC254 Online Continuous UV Absorption Monitor - Swan Analytical USA
These online devices are a fairly new product in our neck of the woods, so we don’t have a lot of feedback on optimization of the reagents, especially given that comparisons from one year to another are hard to obtain in water purification. The idea of determining the dose of coagulant or granular activated carbon (in the case of a TOC abatement) based on the amount of organic matter estimated via the UV absorption measured at 254 nm seems to me to be a move in the right direction in terms of manual dosing (not very reactive) or according to the turbidity (non-linear dose).
I use the word "estimated" because the correlation between TOC and 254-wavelength absorption is difficult to establish. However, this will always be preferable to oxidizable matter that incorporates certain minerals.