How should I make (say) 1 ppm solution?

Question

To make a very small ppm solutions is always a problem, I seek a simple solution for this problem.

Answer 1

As the lawyers like to say, "Asked and answered."  Very well too, I might add.

Answer 2

Aw, shucks, tain't no problem at all.

Put one pound of solute in a bucket, and then add a million pounds of solvent.

Oops. Well, maybe that won't work.

So do it in two steps. Make a 1000 PPM intermediate by adding one gram to a liter.

Then make your final 3 PPM solution by starting with 3 ml of your intermediate and diluting it to 1 liter.

Answer 3

Serial dilution.  Make a 1% solution (10,000ppm).

Get a 1 mL pipette and a 100mL round bottom flask.  1mL of the 1% solution is 100ppm.  Repeat the dilution (1mL in 100mL) and you have 1ppm.

Answer 4

You have gotten good answers.  When I was in the lab business we made stock solutions of a lot of elements.   Since we used a direct current emission spectrophotometer to measure several elements at a time, we made working standards from the stock solutions by combining them on a daily basis to keep them fresh.  Some mixtures and elements can absorb to glass containers making them weaker.