قارن الطرق

	طريقة الإضافة القياسية	قياس الطيف الضوئي المرئي فوق البنفسجي (UV-Vis Spectrophotometry)
المجال	الكيمياء التحليلية	الكيمياء التحليلية
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1920s	1852
صاحب الطريقة	Analytical chemistry practice	August Beer
النوع	matrix-compensating calibration technique	absorption measurement technique
المصدر التأسيسي	Harris, D. C. (2010). Quantitative Chemical Analysis (8th ed.). Freeman. ISBN: 978-1429218153	Beer, A. (1852). Bestimmung der Absorption des rothen Lichts in farbigen Flussigkeiten. Annalen der Physik und Chemie, 86(5), 78–88.
الأسماء البديلة	spiking method, known-addition method, matrix matching	UV-Vis spectroscopy, absorption spectroscopy, colorimetry
ذات صلة	5	5
الملخص	The standard addition method is a quantitative analytical technique that determines the concentration of an unknown analyte by measuring the response before and after adding a known quantity of the analyte (a standard) to the sample itself. This approach compensates for matrix effects and interference from other sample components, making it invaluable when analyzing complex matrices (biological fluids, environmental samples, geological materials) where the sample composition profoundly affects the measured signal. The standard addition method is widely recognized in analytical chemistry as a primary quantification strategy when external calibration is compromised by matrix variability.	UV-Vis spectrophotometry is an optical analytical technique that measures the absorption of ultraviolet and visible light (wavelengths 190–900 nm) by substances in solution. Founded on the Beer-Lambert law (developed by August Beer and Pierre Bouguer), it is one of the oldest and most widely used quantitative analytical methods. UV-Vis spectrophotometry is economical, rapid, and applicable to a vast range of organic and inorganic compounds, making it indispensable in pharmaceutical, clinical, environmental, and research laboratories.