Core Topic: Pesticide Formulation-Pesticide Measurement Role
Now I'd like to speak about how knowledge of formulations plays into proper measuring of pesticide products.
There are a couple things that are important to know.
In our country, our kitchens we measure everything by volume.
We use measuring cups for solids like flour and sugar, but we also use them for liquids like water, milk, and wine.
So, we tend to forget that there's a big difference between a fluid ounce and a dry ounce.
We also tend to forget that dry weight or a dry ounce is density dependent, so four ounces of one material will not take up the same amount of space as four ounces of another.
Here's one illustration: four ounces by dry weight of three different materials in these jars.
You can see that four ounces of Epsom Salt does not take up the same amount of space as four ounces of table salt.
That's because table salt is more dense.
Again, four ounces by dry weight in all three of these jars.
Alternatively, here are four fluid ounces of red dye water.
Again, not the same volume of material in any of these.
The first thing is make sure you know if you want liquid ounce or dry ounce and if you want dry ounce make sure you're using the proper measuring device for the product.
Now, here are, with kitty litter and green water, some pesticide examples.
These are three measuring devices designed for three different dry flowable pesticide products.
All have been filled to the same four ounce line but as you can see there are difference amounts of kitty litter by volume in each of these three jars.
Here is a liquid product four fluid ounces which doesn't align with any of the above.
Make sure you know if it is fluid or dry and if it is dry make sure you are using the device that was calibrated for that product based on its density.
Here are two tubes for two different products and I have put two ounces of dry milk in there to show you what the difference looks like.
If you would grab this tube for this product or vice versa, you're amount would be off.
If you go through all the trouble to calibrate your equipment plus or minus five percent and then you use the wrong measuring device for a dry flowable product or heaven forbid you use a device meant to measure liquids and use it for dries, you're going to be off by a country mile and all of your hard work in calibrating the equipment and doing the math to calculate how much you should put in the tank is all for nothing because you have measured wrong.
Some containers are clearly marked as to what they're intended to measure.
For example, this one says right on it U.S. fluid ounces and that is what it is intended to be used for.
This one you could look all day long and it says ounces but it doesn't tell you what kind of ounces.
In my opinion, this goes in the recycling bin or you could pour in liquids to see if it lines up.
In other words, measure four ounces of liquid in one container and pour it in here to see if it comes up to the four line.
Then you know it is intended for liquid measure.
This container, as nice as it is, says ounces and milliliters.
It doesn't say which kind of ounces, but because I know that milliliters is a liquid measurement, and I this product is a liquid product, I could deduce or assume that it is intended for liquid measure.
It is not as well marked as it could be.
Alternatively, here's one that is very plain Teejet calibration container, says right on there U.S. fluid ounces and milliliters etched.
Even if you spill something that washes off the writing you still have the marks on the container.
This is a nice thing.
Unfortunately, a chemical company took this exact same mold and used it to indicate amounts of a dry flowable product and it says on here: use for Sahara, most people are also going to use it for liquid measure which could ultimately result in in some confusion if folks aren't careful.
Here's another example, same exact mold, this is intended for fluid ounces.
This one says right on it: "Volumetric divides.
Use this for nothing but streamline herbicide." These measurements indicate dry weight so you have got to be careful.
If you grab this one for that or that one for this, you are not going to be happy with the results.
One more time, the devices that come with the dry flowable or Water Dispersible Granule formulation products are product specific.
They should be used for that product and that product only.
They say on there that they are only to be used for a certain product.
They tell you to dispose of them after you use them, not to hoard them and not to use them for other products.
They also give volumetric accuracy plus or minus seven percent, maybe even ten percent.
They tell you that if you need to be more accurate than that you should weigh the material.
I will say that if you go through the trouble to calibrate your equipment and do the math to figure out how much to put in the tank, you don't want to make a measurement mistake by using a rough or improper measuring device.
They do have codes on here that mean something to somebody.
This one for example is a bunch of letters and numbers and it says 09209.That is probably for this batch of materials.
I have seen some of these that you pick up two exactly identical trade name on the tube but the lettering is a little different or maybe even the color is a little different and when you hold them up you see that the lines don't match up.
That's because batches have different carriers or have been reformulated and so you don't want to hoard even for the same product.
You don't want to use a three year old tube for a brand newly purchased product because they may not match up and they may not get the right amount of material into your spray tank.