Azomethine-H monosodium (Azomethine H) is a colour-forming reagent and a boron determinations reagent.

I. Determination of Boron
1. Solution preparation: Dissolve Azomethine-H monosodium salt in an appropriate solvent. Common solvents include water or alcohol solutions.
b. Reaction of Boron: Mix the boron solution in the sample to be tested with the Azomethine-H solution. The pH value may need to be adjusted during the reaction (usually neutral or slightly alkaline).
c. Measurement: Measure the absorbance after the reaction by a spectrophotometer, usually at 420 nm, to calculate the concentration of boron in the sample.
d. Standard curve: Use a boron solution of known concentration to draw a standard curve to quantify the boron content in an unknown sample.
II. Detection of other metal elements
When reacting with other metal ions, the reaction conditions (such as pH and solvent) need to be adjusted according to the reaction characteristics of the specific metal.