How many drops are in a milliliter (mL) of solution used in the low-range Manganese Method 8149?

Document ID

Document ID TE1319

Published Date

Published Date 12/03/2017
Question
How many drops are in a milliliter (mL) of solution used in the low-range Manganese Method 8149?
Summary
Numbers of drops per milliliter
Answer
There is not just one accurate answer for all applications, but in the case of Method 8149 for low-range Manganese, the SCDB (Self Contained Dropper Bottle) delivers about 30 drops per mL. The method asks for 12 drops, or 0.4 mL of solution.

It is important to note this number of drops per mL cannot be universally applied to all droppers and solutions. Glass is more adhesive to water than plastic, but organic solvents are less adhesive, so the size of each drop can change with the properties of the dropper surface and properties of the solution. Therefore, in all other applications it is advised to test the dropper by counting drops onto a digital scale or into a small graduated cylinder.