I haven't bought atrazine since last winter & spring but I recall all I could buy was 4L - all that was out there from several companies. Sounded like "standard atrazine". I sure applied it as standard atrazine (as bad as it sounds, I maybe glanced at label, maybe not - as I've used it a lot over the years).
You have 2 issues with atrazine.... 1) there is a legal limit to it, 2.2 roughly is legal limit. At least in Iowa. If I was doing a one time spraying on switch and I didn't have this restriction, I'd do 4-5. If I did a one time spraying at a higher rate to establish switch & it was LEGAL, I would feel ZERO guilt because that's 1 & only time it's being used and over a small area VS the millions of acres it's applied to yearly or bi-yearly (and on worked up eroded soil) with corn, etc. More the better if legal. 2) Atrazine at "too high a rate" on corn will set your beans back the following year. Especially if applied later, cooler summer, certain soils, etc, etc. Your beans will be hurt. If I'm running beans next year, I'll hit with about 1.5 on the atrazine and then go heavy on the WARRANT (Acetochlor) (similar to Dual II Magnum, etc) which won't hurt beans but the combo keeps weeds down all year, especially at higher rates on Warrant.
Make sure whatever you're using it for, you have exposed soil and not a field full of trash on top.