Merck, 1702300500, Potassium standard solution

Merck Certipur Potassium Standard Solution is a certified reference containing 1,000 mg/L elemental potassium in 0.5 M nitric acid. The single-element stock can be diluted for atomic absorption and other validated elemental spectroscopy procedures that determine potassium in water, nutrient solutions, food digests or industrial process samples. Potassium is abundant in many laboratory reagents and biological materials, so low-level measurements depend on careful control of blanks and accidental transfer. Prepare calibration levels with clean volumetric equipment, and match the solution matrix to the measurement procedure. Carry out calibration verification and sample-quality checks where the analytical method requires them. Do not equate the stated potassium concentration with the mass concentration of potassium nitrate used to formulate the stock. Preserve the lot-specific certified value, uncertainty and dilution records for traceability. The 500 mL bottle is a reference material for laboratory calibration, not a potassium chloride electrolyte solution, nutrient medium or multi-element standard mixture.