How to divide 1/4 teaspoon of granular herbicide into 8 parts?

[JerryHaskins]

OK, I have a few (5 or 6) nutgrass sprouts that keep coming back in my raised beds.

I have dug them up repeatedly and they come back.

I have sprayed them with Roundup and they didn't even notice.

I sprayed them with Image mixed per label instructions and they didn't bat an eye.

I sprayed them with concentrated Image right out of the bottle and they seemed to think it was fertilizer.

I found the attached that says herbicides containing Halosulfuron work better than Image.

Image contains Imazaquin.

SedgeHammer, Hi-Yield Nutsedge Control, and Monterey Nut Grass Killer contain Halosulfuron.

But they are not cheap. I found some Hi-Yield Nutsedge Control at a local garden center. It was $18 for 0.03 ounces (weight). It's a kind of granular solid in tiny little worm-shaped particles.

That's about 1/4 of a teaspoon.

Hmmmm. They say to mix it all in 1 gallon of water and use within 24 hours.

But they say to reapply after a week or two if it didn't kill the nutgrass. That gets expensive.

What I want to do is divide that tiny amount into 8 little ziplock bags and use it as needed. Each little bag would make a pint of solution.

I have some digital postage scales but they don't measure down at those levels. The lowest resolution is like 0.1 ounce.

Anybody got any suggestions on how to divide 1/4 teaspoon of solid into 8 equal little piles?