I don't put limitations on what people can or should do, so kitchen environment
I am reading the paper to mean:
ZN 0.2 (% W/W) is dissolved in 5ml 70% v/v ethanolic aqueous solution.
PE 0.2 (% W/W) is dissolved in 5ml methanol.
(But still checking references because not 100 percent certain at this stage!)
For water, 0.2% (W/W) of 5ml = 10mg. But I'm not sure if this is correct.
Perhaps I am reading this wrong.
After that, the two solutions were mixed and added drop wisely into a pH-adjusted aqueous phase (10 mL) (with either 0.1 N HCl or 0.1 N NaOH) under stirring with a magnetic stirrer (AccuPlateâ„¢ Analog Hot Plate Stirrer, UK) at room temperature and 2000 rpm for 1 h until the evaporation of alcoholic solvents.
The mixer will have to be a cheap kitchen alternative or drill, not looked into it at this stage!
I am interested in the valve or restriction that releases drops, because this task is not simple given my experience with irrigation design and pressure compensation. The commercial solution could be easier?