Used in analytical chemistry for calibration and quantitative analysis of copper content in various samples. Commonly applied in environmental testing to measure copper levels in water, soil, and wastewater. Employed in industrial quality control, especially in electroplating, mining, and metallurgy, to ensure process accuracy. Also utilized in agricultural labs to assess copper concentration in fertilizers and plant tissues. Supports spectrophotometric, titrimetric, and atomic absorption methods due to its known and stable concentration.