Originally Posted By: jwetovick
Originally Posted By: Shorty
Rodeo is supposed to be used with a "non-ionic" surfactant.

I have been trying to research and coming up empty. Do we know that the surfactant in roundup is ionic and not nonionic? I’m curious. Can’t seem to find the answer.


I haven't had much luck either, could it be the concentration of surfactant in the mix that makes one approved for aquatic use and the other one not? Or maybe the type of surfactant?

https://en.m.wikipedia.org/wiki/Polyethoxylated_tallow_amine

Quote:
POEA concentrations range from <1% in ready-to-use glyphosate formulations to 21% in concentrates.[2] POEA constitutes 15% of Roundup formulations and the phosphate ester neutralized polyethoxylated tallow amine surfactant constitutes 14.5% of Roundup Pro.[


Quote:
A review of the literature provided to the EPA in 1997 found that POEA was generally more potent in causing toxicity to aquatic organisms than glyphosate, and that POEA becomes more potent in more alkaline environments.