How can I check to see if my PAR Standard is at the correct concentration of 4mg/mL?
A. Remove 10.0 0.1 mL with a volumetric pipet, place in a tared aluminum pan, evaporate in a fume hood until dry spots start to appear in the bottom of the pan, desiccate for a minimum of 30 minutes until achieving a stable weight which must be 40 1 mg. If not, prepare or obtain a fresh solution. Besides incorrect standard preparation, pipetting/ volumetric errors or concentration technique, other possible causes for high or low concentration values are 1) evaporation of the acetone over time, 2) pipetting visible and variable amounts of precipitates or 3) visible precipitates sticking to the PTFE cap liner of the container.
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