I’m testing on samples that require a concentration of 1000 ppb (or 1 mg/L) of Pb 2+. My first thought was to simply dissolve 1 mg of Lead nitrate in 1 L of deionized distilled water to create 1 L of stock solution at the desired 1000 ppb (1 mg/L) concentration.
Is the process as simple as that, or is 1 mg proportionally too small a mass of solute to dissolve in 1 L of distilled water? Should I create a more concentrated stock solution and dilute it to 1000 ppb by adding requisite amounts of water? What concentration stock solution would be recommended in this case?
All the best!