2843 90 — Inorganic or organic compounds of precious metals, whether or not chemically defined (excl. silver and gold); amalgams of precious metals

2843 Drago metals of value in the colloidal state; compounds of inorganic or organic precious metals, of certain or indefinite chemical composition; precious metal amalgams: 2843 10 - precious metals in the colloidal state - silver compounds: 2843 21 - - silver nitrate 2843 29 - - - other 2843 30 - gold compounds 2843 90 - other compounds;

(A) Precious metals in a colloidal state

This heading covers the precious metals referred to in Chapter 71 (i.e., silver, gold, platinum, iridium, osmium, palladium, rhodium and ruthenium), provided they are in the colloidal state. These precious metals in the colloidal state are obtained by dispersion or cathode sputtering, or by reduction of one of their inorganic salts. Colloidal silver is in the form of small grains or flakes, bluish, brownish or greenish-grey in colour, with a metallic lustre. It is used in medicine as an antiseptic. Colloidal gold may be red, violet, blue or green and is used for the same purposes as colloidal silver. Colloidal platinum is in the form of fine grey particles and has remarkable catalytic properties. These metals in the colloidal state (e.g., gold) fall in this heading if they are presented as a colloidal solution containing protective colloids (such as gelatin, casein, isinglass). (B) INORGANIC OR ORGANIC COMPOUNDS OF PRECIOUS METALS, WHETHER OR NOT CHEMICALLY DEFINED These are the following compounds: (I) Oxides, peroxides and hydroxides of precious metals, analogous to the compounds of sub-Chapter IV. (II) Inorganic salts of precious metals, analogous to the compounds of sub-Chapter V. (III) Phosphides, carbides, hydrides, nitrides, silicides and borides, analogous to the compounds of headings 2849, 2850 and 2853 (such as platinum phosphide, palladium hydride, silver nitride, platinum silicide). (IV) Organic compounds of precious metals, analogous to the compounds of Chapter 29. This heading also covers compounds containing both precious metals and other metals (e.g., double salts of a base metal and a precious metal, esters containing precious metals). The most common compounds of precious metals are listed below: (1) Silver compounds: (a) Silver oxides. Disilver oxide (Ag2O) is a brownish-black powder, slightly soluble in water. It turns black in light. Silver oxide (AgO) is a greyish-black powder. Silver oxides are used, inter alia, in the manufacture of accumulators; (b) Silver halides. Silver chloride (AgCl) is a white mass or dense powder, insoluble in water, which darkens in light; it is packed in dark-coloured opaque containers. Used in photography, in the manufacture of ceramics, in medicine and for silvering. Cerargyrite (or horn silver), natural silver chlorides and iodides, is excluded (heading 2616).

Silver bromide (yellowish), sulphur iodide (yellow), and silver fluoride are used for the same purposes as chlorides; (c) silver sulfide. Artificial silver sulphide (Ag 2S) is a heavy gray-black powder that is not soluble in water, used to make glass. Natural silver sulfide (argent it), natural silver and antimony sulfide (pyrar gyrite, stefanite, polybasite) and natural silver and arsenic sulfide (proustite) are excluded (heading 2616); (d) silver nitrate (AgNO3) – white crystals soluble in water, toxic, damaging the skin. And it is used for silvering glass or metals; for coloring silk or horn; in photography; for the production of indelible ink; as an antiseptic or a remedy against parasites. It is sometimes referred to as "lapis", although this name also applies to silver RA nitrate fused with a small amount of sodium or potassium nitrate, and sometimes with a small amount of silver chloride, for the purpose of producing cauterizing agents (Chapter 30); (e) other salts and inorganic compounds. Silver sulfate (Ag2SO4), crystals. Silver phosphate (Ag 3PO4), yellowish crystals, insoluble in water; used in medicine, photography and optics. Silver cyanide (AgCN), a white powder darkening in light, insoluble in water; used in medicine and for electrodeposition of silver. Thiocia nat silver (AgSCN) has a similar look and is used as an amplifier in photography. Complex cyanide salts of silver and potassium (KAg(CN)2) or silver and sodium (NaAg(CN)2) are white soluble salts used in electrolytic coating. Silver fulminate (rattling silver), white crystals that explode on a light impact, dangerous in processing; used for the production of detonator caps. Silver dichromate (Ag 2Cr2O7), a crystalline ruby-red powder, insoluble in water; used in the performance of artistic miniatures (silver red, purple red). Silver permanganate, a crystalline dark purple powder soluble in water; used in gas masks. Silver azide, explosive; (f) organic silver compounds. These include: (i) silver lactate (white powder) and silver citrate (yellowish powder); used in photography and as antiseptics; (ii) silver oxalate, which decomposes and explodes when heated; (iii) acetate, benzoate, butyrate, cinnamate, picrate, salicylate, tartrate and silver valerate; (iv) proteinates, nucleates, nucleinates, albuminates, peptons, vitellinates and silver tanates. (2) Gold compounds: (a) oxides. Univalent gold oxide (Au 2O). Insoluble dark purple powder. Trivalent gold oxide (Au 2O3) (trivalent gold anhydride) – brown powder; corresponding acid – gold hydroxide or acid

(Au(OH)3), a black product that decomposes in light, from which alkali metal aurates are obtained; (b) chlorides. Univalent gold chloride (AuCl), a yellowish or reddish crystalline powder. Gold trichloride (AuCl 3) (trivalent gold chloride, brown chloride) is a reddish-brown powder or crystal mass, very hygroscopic, often supplied in sealed canisters or tubes. Tetrachlorogolate (III) acid (AuCl 3·HCl·4H2O) (yellow chloride) – yellow crystals hydrated and alkali metal chloraurates – reddish-yellow crystals are also included in this heading. These products are used in photography (preparation of tinting solutions), in the ceramics or glass industry and in medicine. This heading does not include purple cassium, which is a mixture of tin hydroxide and colloidal gold (Chapter 32); it is used in the manufacture of paints or varnishes and, in particular, for the colouring of porcelain; (c) other compounds . Gold sulfide (Au 2S3) is a ferrous substance which, when combined with alkaline sulfides of alkaline metals, forms thioaurates. Double sulphites of gold and sodium (NaAu(SO 3)), as well as gold and ammonium (NH4Au(SO3)) are available as colorless solutions and are used in electrolytic coating. Sodium aurothiosulphate is used in medicine. Gold cyanide (AuCN), a crystalline yellow powder that decomposes when heated, is used for electrolytic gilding and in medicine. Reacts with alkali metal cyanides, giving cyanoaurates of gold, such as potassium tetracyanoaurate (KAu(CN4)), which is a white soluble salt used in the application of a galvanic coating. Sodium aurothiocyanate, crystallized as orange needle crystals, is used in medicine and photography (toning solutions). (3) Ruthenium compounds . Ruthenium dioxide (RuO2) is a blue product, ruthenium tetraoxide (RuO4) is an orange product. Ruthenium trichloride (RuCl 3) and ruthenium tetrachloride (RuCl 4) give double chlorides with alkali metal chlorides and ammino- or nitrozocomplexes. There are also double nitrites of ruthenium or alkali metals. (4) Rhodium hydroxide (Rh(OH) 3) corresponds to rhodium oxide (Rh 2O3), is a black powder. Rhodium trichloride (RhCl 3) gives chlororodites with alkali metal chlorides; there are also sulfate with its complex alum or phosphates, nitrate and complex nitrites. There are also cyanorodites and complex ammino derivatives or oxalic acid derivatives. (5) Palladium compounds The most stable oxide is divalent palladium oxide (PdO), the only basic oxide. It is a black powder that decomposes when heated. Divalent palladium chloride (PdCl 2), a brown spreading powder soluble in water and crystallized with 2 water molecules, is used in ceramics, photography and electroplating. Potassium chloropalladite (K 2PdCl4), a brown salt that is well soluble, used as an indicator of the presence of carbon monoxide, is also included here. There are also

chloropalladates, ammino compounds (palladium diammines), thiopalladates, ita palladoniter, cyanopalladites, palladooxalates and sulphate of divalent palladium. (6) Osmium dioxide (OsO2) is a dark brown powder. Osmium tetraoxide (OsO 4) is a volatile solid product that crystallizes as white needle-shaped crystals; it acts on the eyes and lungs; it is used in histology and micrography. Tetraoxide yields osmats such as potassium osmat (red crystals), and when treated with ammonia and alkali metal hydroxides, osmiamates such as potassium osmiamate or sodium, which are yellow crystals. Osmium tetrachloride (OsCl 4) and osmium trichloride (OsCl 3) give chloroosmates and alkali metal chloroosmites. (7) Iridium compounds. In addition to iridium oxide, there are iridium tetrahydroxide (Ir(OH) 4), a solid blue substance, chloride, chloroiridates and chlorine oiridites, double sulfates and ammino compounds. (8) Platinum compounds: (a) oxides. Divalent platinum oxide (PtO) is a purple or blackish substance in the form of a powder. Quadrivalent platinum oxide, or platinum dioxide (PtO2), forms several hydrates, of which one, tetrahydrate (H2Pt(OH)6), is a complex acid (hexahydroxoplatinic acid) to which salts, such as alkaline metal hexahydroxoplatinates, correspond. There are also appropriate amminocomplexes; (b) other compounds. Quadrivalent platinum chloride (PtCl 4) exists as a brown powder or yellow solution; it is used as a reagent. Technical platinum chloride (hexachloroplatinic acid) (H 2PtCl6) - floating prismatic crystals, colored in a red color, soluble in water; used in photography (toning solutions), when applying a galvanic coating, for glazing ceramics or for obtaining a platinum sponge. There are appropriate platinum amminocomplexes. There are also amminocomplexes corresponding to tetrachloroplatinic acid (H2PtCl4), which is a red solid. Potassium or barium cyanoplatinites are used in the manufacture of fluorescent screens for radiography. (C) Precious Metal Amalgams are alloys of precious metals with mercury. Amalgams of gold or silver, the most famous representatives of such products, are used as intermediates in the production of these precious metals. This heading covers amalgams containing both precious metals and base metals (for example, certain amalgams used in dentistry); but this heading does not cover amalgams wholly of base metal (heading 2853). Compounds of mercury of chemical composition other than amalgams are excluded (heading 2852).

Notes

English text as published in Annex I to Regulation (EU) 2021/1832 (Combined Nomenclature). The EAEU tariff and the EU nomenclature copy these notes from the same convention. For a Russian declaration the binding version is the Russian one: Annex to Decision No 80 of the EEC Council of 14 September 2021.

1. Except where the context otherwise requires, the headings of this chapter apply only to:

(a) separate chemical elements and separate chemically defined compounds, whether or not containing impurities;

(b) the products mentioned in (a) above dissolved in water;

(c) the products mentioned in (a) above dissolved in other solvents provided that the solution constitutes a normal and necessary method of putting up these products adopted solely for reasons of safety or for transport and that the solvent does not render the product particularly suitable for specific use rather than for general use;

(d) the products mentioned in (a), (b) or (c) above with an added stabiliser (including an anti-caking agent) necessary for their preservation or transport;

(e) the products mentioned in (a), (b), (c) or (d) above with an added anti-dusting agent or a colouring substance added to facilitate their identification or for safety reasons, provided that the additions do not render the product particularly suitable for specific use rather than for general use.

2. In addition to dithionites and sulphoxylates, stabilised with organic substances (heading 2831), carbonates and peroxocarbonates of inorganic bases (heading 2836), cyanides, cyanide oxides and complex cyanides of inorganic bases (heading 2837), fulminates, cyanates and thiocyanates, of inorganic bases (heading 2842), organic products included in headings 2843 to 2846 and 2852 and carbides (heading 2849), only the following compounds of carbon are to be classified in this chapter:

(a) oxides of carbon, hydrogen cyanide and fulminic, isocyanic, thiocyanic and other simple or complex cyanogen acids (heading 2811);

(b) halide oxides of carbon (heading 2812);

(c) carbon disulphide (heading 2813);

(d) thiocarbonates, selenocarbonates, tellurocarbonates, selenocyanates, tellurocyanates, tetrathiocyanatodiamminochromates (reineckates) and other complex cyanates, of inorganic bases (heading 2842);

(e) hydrogen peroxide, solidified with urea (heading 2847), carbon oxysulphide, thiocarbonyl halides, cyanogen, cyanogen halides and cyanamide and its metal derivatives (heading 2853) other than calcium cyanamide, whether or not pure (Chapter 31).

3. Subject to the provisions of note 1 to Section VI, this chapter does not cover:

(a) sodium chloride or magnesium oxide, whether or not pure, or other products of Section V;

(b) organo-inorganic compounds other than those mentioned in note 2 above;

(c) products mentioned in note 2, 3, 4 or 5 to Chapter 31;

(d) inorganic products of a kind used as luminophores, of heading 3206; glass frit and other glass in the form of powder, granules or flakes, of heading 3207;

(e) artificial graphite (heading 3801); products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 3813; ink removers put up in packings for retail sale, of heading 3824; cultured crystals (other than optical elements) weighing not less than 2,5 g each, of the halides of the alkali or alkaline-earth metals, of heading 3824;

(f) precious or semi-precious stones (natural, synthetic or reconstructed) or dust or powder of such stones (headings 7102 to 7105), or precious metals or precious-metal alloys of Chapter 71;

(g) the metals, whether or not pure, metal alloys or cermets, including sintered metal carbides (metal carbides sintered with a metal), of Section XV; or

(h) optical elements, for example, of the halides of the alkali or alkaline-earth metals (heading 9001).

4. Chemically defined complex acids consisting of a non-metal acid of sub-chapter II and a metal acid of sub-chapter IV are to be classified in heading 2811.

5. Headings 2826 to 2842 apply only to metal or ammonium salts or peroxysalts. Except where the context otherwise requires, double or complex salts are to be classified in heading 2842.

6. Heading 2844 applies only to:

(a) technetium (atomic No 43), promethium (atomic No 61), polonium (atomic No 84) and all elements with an atomic number greater than 84;

(b) natural or artificial radioactive isotopes (including those of the precious metals or of the base metals of Sections XIV and XV), whether or not mixed together;

(c) compounds, inorganic or organic, of these elements or isotopes, whether or not chemically defined, whether or not mixed together;

(d) alloys, dispersions (including cermets), ceramic products and mixtures containing these elements or isotopes or inorganic or organic compounds thereof and having a specific radioactivity exceeding 74 Bq/g (0,002 μCi/g);

(e) spent (irradiated) fuel elements (cartridges) of nuclear reactors;

(f) radioactive residues whether or not usable. The term ‘isotopes’, for the purposes of this note and of the wording of headings 2844 and 2845, refers to: — individual nuclides, excluding, however, those existing in nature in the monoisotopic state, — mixtures of isotopes of one and the same element, enriched in one or several of the said isotopes, that is, elements of which the natural isotopic composition has been artificially modified.

7. Heading 2853 includes copper phosphide (phosphor copper) containing more than 15 % by weight of phosphorus.

8. Chemical elements (for example, silicon and selenium) doped for use in electronics are to be classified in this chapter, provided that they are in forms unworked as drawn, or in the form of cylinders or rods. When cut in the form of discs, wafers or similar forms, they fall in heading 3818.

Subheading note

Machine translation. The original is the Russian text of the EAEU tariff, and customs goes by it; this translation is for understanding only and has no legal force.

1. В субпозиции 2852 10 термин «определенного химического состава» означает все органические или неорганические соединения ртути, удовлетворяющие требованиям примечаний 1 (а) – 1 (д) к группе 28 и примечаний 1 (а) – 1 (з) к группе 29.

Additional note

Machine translation. The original is the Russian text of the EAEU tariff, and customs goes by it; this translation is for understanding only and has no legal force.

1. Unless otherwise specified, the salts referred to in the subheadings include acid salts and basic salts.