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Harmonized System
Section VI > Chapter 28 > Heading 2832
… Sulphites; thiosulphates. …
Explanatory notes
… this heading covers : (A) Metal sulphites ‑ salts of sulphurous acid (H 2 SO 3 ) (which exists only in aqueous … aqueous solution of sodium carbonate. Colourless powder or crystals, rather unstable, with a smell of sulphur dioxide … Disodium disulphite (sodium metabisulphite, pyrosulphite, dry sulphite and, in some languages, incorrectly referred to …Section VI > Chapter 28 > Heading 2833
… Sulphates; alums; peroxosulphates (persulphates). …
Explanatory notes
… 28.33 ‑ Sulphates; alums; peroxosulphates (persulphates). … of sulphuric acid (H 2 SO 4 ) (heading 28.07), but excludes mercury sulphates which fall in heading 28.52, ammonium … or hydrated state as a powder or in large transparent crystals, efflorescing in the air and dissolving in water …Section VI > Chapter 28 > Heading 2813
… Sulphides of non-metals; commercial phosphorus trisulphide. …
Explanatory notes
… commercial phosphorus trisulphide. 2813.10 ‑ Carbon disulphide 2813.90 ‑ Other The most important of these binary compounds are : (1) Carbon disulphide (CS 2 ). … of sulphur vapour on strongly heated silicon. White solid; crystallises in volatile needles. Decomposes water with …Section V > Chapter 26 > Heading 2603
Explanatory notes
… , basic copper carbonate. (c) Bornite (or erubescite), sulphide of copper and iron. (d) Bournonite , sulphide of copper, lead and antimony. (e) Brochantite , … (copper pyrites), sulphide of copper and iron. (h) Chrysocolla , hydrated copper silicate. (ij) Covellite , …Section VI > Chapter 28 > Heading 2808
… Nitric acid; sulphonitric acids. …
Explanatory notes
… 28.08 ‑ Nitric acid; sulphonitric acids. (A) NITRIC ACID Nitric acid (HNO 3 ) is … Its uses include the manufacture of nitrates (of silver, mercury, lead, copper, etc.), organic dyes, explosives … for nitrating organic compounds in the synthetic dyestuffs industry, and in the manufacture of nitrocellulose and …Section VI > Chapter 28 > Heading 2807
… Sulphuric acid; oleum. …
Explanatory notes
… 28.07 ‑ Sulphuric acid; oleum. (A) SULPHURIC ACID Sulphuric acid (H … hydrogen sulphide or ammonium sulphide. Sulphuric acid is a very strong corrosive. It is a dense, oily liquid, … Oleum is largely used in sulphonation reactions in organic chemistry (preparation of naphthalenesulphonic acid, …Section VI > Chapter 28 > Heading 2852
… Inorganic or organic compounds of mercury, whether or not chemically defined, excluding …