A barium standard solution is a high-purity, precisely concentrated solution of barium, typically used for calibrating instruments like AAS (Atomic Absorption Spectrophotometry) or IC (Ion Chromatography). These solutions are often prepared with a specific concentration, such as 1000 mg/L Ba, dissolved in a precise acidic matrix like nitric acid (𝐻𝑁𝑂3) for stability
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