Merck, 1702300100, Potassium standard solution

Certipur potassium standard solution is a traceable analytical reference for instrumental measurement of potassium in laboratory samples. The liquid contains 1000 mg/L potassium, prepared from potassium nitrate in 0.5 mol/L nitric acid, and is supplied in a 100 mL bottle. It is suitable for preparing calibration standards for techniques such as atomic absorption spectroscopy and inductively coupled plasma analysis when used with an appropriate matrix and measurement method. The acidic solution helps maintain the reference composition but requires compatible labware and standard precautions for corrosive materials. Prepare lower concentration points by calculated dilution with suitable diluent, and account for the acid matrix when matching sample and calibration conditions. Contamination from pipettes or shared containers can compromise low-level elemental determinations, so handle aliquots cleanly and keep the original bottle closed. This is an elemental concentration reference, not a potassium nutritional supplement or an aqueous physiological buffer.