Wavelength selection for the determination of iron ions in water
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Should it be 510nm or 420nm? How to choose?
It is recommended to choose 510 nm; the standard requirement is 510, and this is the wavelength used for creating standard curves. The absorbance of iron at 510 nm is suitable, so you can give it a try
It depends on the color developer you use; select the wavelength that yields maximum absorption based on the color displayed. It’s also available under this standard.
This requires that method, where the colorant complexes with iron ions to produce color
When using the sulfosalicylic acid method to determine iron, why is 420 nm chosen in some cases, 425 nm in others, and 430 nm in yet other cases?
The wavelength for measuring iron using the sulfosalicylic acid method is 420 nm, while the wavelength for measuring iron using the o-phenanthroline method is 510 nm