In aqueous solutions of sulfides a pH-dependent equilibrium exists between dissolved hydrogen sulfide (H2S), hydrogen sulfide ions (HS-), and sulfide ions (S2-). In the acidic range, in which practically only dissolved
hydrogen sulfide is present, this reacts with dimethyl-p-phenylenediamine and iron(III) ions to form methylene blue. This is determined photometrically.
The method is analogous to EPA 376.2, APHA 4500-S2- D, ISO10530, and DIN 38405-26.
|Safety Information according to GHS|
|Precautionary Statement(s)||P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.
P301 + P330 + P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P302 + P352: IF ON SKIN: Wash with plenty of soap and water.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P308 + P310: IF exposed or concerned: immediately call a POISON CENTER or doctor/ physician.
|Storage class||8B Non-combustible, corrosive hazardous materials|
|Storage and Shipping Information|
|Storage||Store at +15°C to +25°C.|
|Declaration (railroad and road) ADR, RID||UN 3316 Chemie-Testsatz, 9, II|
|Declaration (transport by air) IATA-DGR||UN 3316 CHEMICAL KIT, 9, II|
|Declaration (transport by sea) IMDG-Code||UN 3316 CHEMICAL KIT, 9, II|