The sample is dissolved in water, and after acidification, the sulfide is converted into hydrogen sulfide. At the same time, the hydrogen sulfide is brought to the absorption solution containing triethanolamine-EDTA-sodium hydroxide with air. In the presence of iron (Ⅲ), it is mixed with N, N- Dimethyl-p-phenylenediamine reacts to form a methylene blue complex, and the absorbance is measured on a spectrophotometer at a wavelength of 665 nm. Calculate the sulfide mass fraction.
T/CAIA SH001-2014 history
2014T/CAIA SH001-2014 Monosodium glutamate—Determination of sulfide—Methylene blue spectrophotometric method