For spectrophotometric and other methods buffer solutions are used.

For the determination of L-carnitine in premixtures: ion chromatography method with electrical conductivity detection (IC-ECD) or Spectrophotometric method after enzymatic reaction with carnitine-acetyl-transferase.

Clear liquids -- Estimation of colour by the Gardner colour scale -- Part 2: Spectrophotometric method

Clear liquids — Estimation of colour by the platinum-cobalt scale — Part 2: Spectrophotometric method

Clear liquids -- Estimation of colour by the Gardner colour scale -- Part 2: Spectrophotometric method

Clear liquids -- Estimation of colour by the Gardner colour scale -- Part 2: Spectrophotometric method

Clear liquids -- Estimation of colour by the platinum-cobalt scale -- Part 2: Spectrophotometric method

This European Standard specifies a spectrophotometric method for the determination of silicon in zinc alloys.

This European Standard specifies a spectrophotometric method for the determination of iron in zinc alloys.

For the determination of L-carnitine L-tartrate (expressed as L-carnitine) in water: potentiometric titration or Spectrophotometric method after enzymatic reaction with carnitine-acetyl-transferase.

ISO 6271-2:2004 specifies a spectrophotometric method for estimating the colour, in Pt-Co units, of clear liquids.

Determination of mass concentration of sulphur dioxide in ambient air: Thorin spectrophotometric method

Here, we present a protocol to quantitatively determine phycobiliprotein content in the cyanobacterium Synechocystis using a spectrophotometric method.

Chemical analysis of steel and cast iron - Determination of total silicon content - Reduced molybdosilicate spectrophotometric method - Part 1: Silicon content between 0,05 and 1,0%

Chemical analysis of steel and cast iron - Determination of total silicon content - Reduced molybdosilicate spectrophotometric method - Part 1: Silicon content between 0,05 and 1,0%