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Section VI

PRODUITS DES INDUSTRIES CHIMIQUES OU DES INDUSTRIES CONNEXES

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Chapitre 28

Produits chimiques inorganiques; composés inorganiques ou organiques de métaux précieux, d'éléments radioactifs, de métaux des terres rares ou d'isotopes

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I.-

CHEMICAL ELEMENTS

Sub-Chapter I

CHEMICAL ELEMENTS

GENERAL

Chemical elements can be divided into two classes, non‑metals and metals. In general, this sub‑Chapter includes all non‑metals at least in some of their forms, whereas numerous metals are classified elsewhere : ‑ precious metals (Chapter 71 and heading 28.43), base metals (Chapters 72 to 76 and 78 to 81) and radioactive chemical elements and isotopes (heading 28.44) and stable isotopes (heading 28.45).

An alphabetical list of the various known elements, indicating the appropriate classification, is given below. Some elements, such as antimony, behave both as metals and as non‑metals; attention is drawn to their classification in the Nomenclature.

Element

Symbol

Atomic Number

Classification

Actinium...........

Ac

89

Radioactive element (28.44).

Aluminium........

Al

13

Base metal (Chapter 76).

Americium........

Am

95

Radioactive element (28.44).

Antimony..........

Sb

51

Base metal (81.10).

Argon.................

Ar

18

Rare gas (28.04).

Arsenic...............

As

33

Non‑metal (28.04).

Astatine.............

At

85

Radioactive element (28.44).

Barium..............

Ba

56

Alkaline‑earth metal (28.05).

Berkelium.........

Bk

97

Radioactive element (28.44).

Beryllium..........

Be

4

Base metal (81.12).

Bismuth.............

Bi

83

Base metal (81.06).

Boron.................

B

5

Non‑metal (28.04).

Bromine............

Br

35

Non‑metal (28.01).

Cadmium..........

Cd

48

Base metal (81.07).

Caesium............

Cs

55

Alkali metal (28.05).

Calcium.............

Ca

20

Alkaline‑earth metal (28.05).

Californium......

Cf

98

Radioactive element (28.44).

Carbon..............

C

6

Non‑metal (28.03). (But see 38.01 for artificial graphite.)

Cerium...............

Ce

58

Rare‑earth metal (28.05).

Chlorine.............

Cl

17

Non‑metal (28.01).

Chromium........

Cr

24

Base metal (81.12).

Cobalt................

Co

27

Base metal (81.05).

Copper...............

Cu

29

Base metal (Chapter 74).

Curium..............

Cm

96

Radioactive element (28.44).

Dysprosium......

Dy

66

Rare‑earth metal (28.05).

Einsteinium.......

Es

99

Radioactive element (28.44).

Erbium...............

Er

68

Rare‑earth metal (28.05).

Europium..........

Eu

63

Rare‑earth metal (28.05).

Fermium............

Fm

100

Radioactive element (28.44).

Fluorine.............

F

9

Non‑metal (28.01).

Francium...........

Fr

87

Radioactive element (28.44).

Gadolinium.......

Gd

64

Rare‑earth metal (28.05).

Gallium..............

Ga

31

Base metal (81.12).

Germanium......

Ge

32

Base metal (81.12).

Gold...................

Au

79

Precious metal (71.08).

Hafnium...........

Hf

72

Base metal (81.12).

Helium...............

He

2

Rare gas (28.04).

Holmium...........

Ho

67

Rare‑earth metal (28.05).

Hydrogen..........

H

1

Non‑metal (28.04).

Indium...............

In

49

Base metal (81.12)

Iodine................

I

53

Non‑metal (28.01).

Iridium...............

Ir

77

Precious metal (71.10).

Iron....................

Fe

26

Base metal (Chapter 72).

Krypton.............

Kr

36

Rare gas (28.04).

Lanthanum......

La

57

Rare‑earth metal (28.05).

Lawrencium.....

Lr

103

Radioactive element (28.44).

Lead...................

Pb

82

Base metal (Chapter 78).

Lithium..............

Li

3

Alkali metal (28.05).

Lutetium...........

Lu

71

Rare‑earth metal (28.05).

Magnesium.......

Mg

12

Base metal (81.04).

Manganese.......

Mn

25

Base metal (81.11).

Mendelevium...

Md

101

Radioactive element (28.44).

Mercury.............

Hg

80

Metal (28.05).

Molybdenum...

Mo

42

Base metal (81.02).

Neodymium.....

Nd

60

Rare‑earth metal (28.05).

Neon..................

Ne

10

Rare gas (28.04).

Neptunium........

Np

93

Radioactive element (28.44).

Nickel.................

Ni

28

Base metal (Chapter 75).

Niobium............

Nb

41

Base metal (81.12).

Nitrogen.............

N

7

Non- metal (28.04).

Nobelium..........

No

102

Radioactive element (28.44).

Osmium.............

Os

76

Precious metal (71.10).

Oxygen..............

O

8

Non‑metal (28.04).

Palladium..........

Pd

46

Precious metal (71.10).

Phosphorus.......

P

15

Non‑metal (28.04).

Platinum............

Pt

78

Precious metal (71.10).

Plutonium.........

Pu

94

Radioactive element (28.44).

Polonium...........

Po

84

Radioactive element (28.44).

Potassium.........

K

19

Alkali metal (28.05).

Praseodymium.

Pr

59

Rare‑earth metal (28.05).

Promethium......

Pm

61

Radioactive element (28.44).

Protactinium.....

Pa

91

Radioactive element (28.44).

Radium.............

Ra

88

Radioactive element (28.44).

Radon................

Rn

86

Radioactive element (28.44).

Rhenium...........

Re

75

Base metal (81.12).

Rhodium...........

Rh

45

Precious metal (71.10).

Rubidium..........

Rb

37

Alkali metal (28.05).

Ruthenium........

Ru

44

Precious metal (71.10).

Samarium.........

Sm

62

Rare‑earth metal (28.05).

Scandium..........

Sc

21

Classified with the rare‑earth metals (28.05).

Selenium...........

Se

34

Non‑metal (28.04).

Silicon................

Si

14

Non‑metal (28.04).

Silver..................

Ag

47

Precious metal (71.06).

Sodium..............

Na

11

Alkali metal (28.05).

Strontium..........

Sr

38

Alkaline‑earth metal (28.05).

Sulphur..............

S

16

Non‑metal (28.02). (But see 25.03 for crude sulphur).

Tantalum..........

Ta

73

Base metal (81.03).

Technetium......

Tc

43

Radioactive element (28.44).

Tellurium...........

Te

52

Non‑metal (28.04).

Terbium.............

Tb

65

Rare‑earth metal (28.05).

Thallium............

Tl

81

Base metal (81.12).

Thorium............

Th

90

Radioactive element (28.44).

Thulium.............

Tm

69

Rare‑earth metal (28.05).

Tin......................

Sn

50

Base metal (Chapter 80).

Titanium...........

Ti

22

Base metal (81.08).

Tungsten...........

W

74

Base metal (81.01).

Uranium............

U

92

Radioactive element (28.44).

Vanadium.........

V

23

Base metal (81.12).

Xenon................

Xe

54

Rare gas (28.04).

Ytterbium..........

Yb

70

Rare‑earth metal (28.05).

Yttrium..............

Y

39

Classified with the rare‑earth metals (28.05).

Zinc....................

Zn

30

Base metal (Chapter 79).

Zirconium.........

Zr

40

Base metal (81.09).

Position 2801

Fluor, chlore, brome et iode.

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Position 2802

Soufre sublimé ou précipité; soufre colloïdal.

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Position 2803

Carbone (noirs de carbone et autres formes de carbone non dénommées ni comprises ailleurs).

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Position 2804

Hydrogène, gaz rares et autres éléments non métalliques.

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Position 2805

Métaux alcalins ou alcalino-terreux; métaux de terres rares, scandium et yttrium, même mélangés ou alliés entre eux; mercure.

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II.-

ACIDES INORGANIQUES ET COMPOSES OXYGENES INORGANIQUES DES ELEMENTS NON METALLIQUES

Sous-Chapitre II

ACIDES INORGANIQUES ET COMPOSES OXYGENES INORGANIQUES

DES ELEMENTS NON METALLIQUES

CONSIDERATIONS GENERALES

Les acides sont des composés contenant de l'hydrogène remplaçable en tout ou en partie par un métal (ou par un ion de propriétés analogues, tel que l'ion d'ammoniumen (NH4+)) donnant des sels. Ils réagissent sur les bases en donnant également des sels et sur les alcools en donnant des esters. A l'état liquide ou en solution, ce sont des électrolytes donnant de l'hydrogène à la cathode. Privés d'une ou plusieurs molécules d'eau, ceux des acides qui contiennent de l'oxygène (oxacides) donnent des anhydrides. La plupart des oxydes d'éléments non métalliques constituent des anhydrides.

Le Sous‑Chapitre II comprend, d'une part, tous les oxydes inorganiques des éléments non métalliques (anhydrides et autres), d'autre part, les acides inorganiques dont le radical anodique est non métallique.

Par contre, ceux des anhydrides et acides qui sont constitués respectivement par des oxydes et des hydroxydes de métaux entrent, en général, dans le Sous‑Chapitre IV (oxydes, hydroxydes et peroxydes de métaux) ‑ tel est le cas pour les anhydrides et les acides chromique, molybdénique, tungstique ou vanadique ‑ ou, dans certains cas, dans les n°s 28.43 (composés des métaux précieux), 28.44 ou 28.45 (composés des éléments radioactifs ou d'isotopes) ou 28.46 (composés des métaux des terres rares, du scandium, ou de l'yttrium).

Les composés oxygénés de l'hydrogène sont repris aux n°s 22.01 (eau), 28.45 (eau lourde),28.47 (peroxyde d'hydrogène), 28.53 (eaux distillées, de conductibilité ou de même degré de pureté, y compris les eaux permutées).

Position 2806

Chlorure d'hydrogène (acide chlorhydrique); acide chlorosulfurique.

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Position 2807

Acide sulfurique; oléum.

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Position 2808

Acide nitrique; acides sulfonitriques.

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Position 2809

Pentaoxyde de diphosphore; acide phosphorique; acides polyphosphoriques, de constitution chimique définie ou non.

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Position 2810

Oxydes de bore; acides boriques.

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Position 2811

Autres acides inorganiques et autres composés oxygénés inorganiques des éléments non métalliques.

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III.-

DERIVES HALOGENES, OXYHALOGENES OU SULFURES DES ELEMENTS NON METALLIQUES

Sous-Chapitre III

DERIVES HALOGENES, OXYHALOGENES OU SULFURES DES ELEMENTS NON METALLIQUES

CONSIDERATIONS GENERALES

Ce Sous‑Chapitre comprend des produits qui, bien que désignés sous des noms (chlorures, sulfures, etc.) rappelant ceux des sels de métaux des hydracides repris au Sous‑Chapitre V, constituent, en réalité, des combinaisons non métalliques comprenant :

1) Soit, d'une part, un halogène et, d'autre part, un élément non métallique autre que l'oxygène ou l'hydrogène (dérivés halogénés des éléments non métalliques).

2) Soit les mêmes dérivés qu'au 1) ci‑dessus, combinés avec de l'oxygène (oxyhalogénures).

3) Soit, d'une part, le soufre, d'autre part, un élément non métallique autre que l'oxygène ou l'hydrogène (dérivés sulfurés des éléments non métalliques).

Les oxysulfures des éléments non métalliques (soufre+oxygène+élément non métallique) ne relèvent pas de ce Sous‑Chapitre; ils entrent dans le n° 28.53.

Les halogénures et oxyhalogénures des métaux et les sulfures des métaux (voir les Considérations générales du Sous‑Chapitre I) ou de l'ion d'ammonium (NH4+) entrent dans le Sous‑Chapitre V, exception faite des composés de métaux précieux (n° 28.43) et des composés des n°s 28.44, 28.45, 28.46 ou 28.52.

Position 2812

Halogénures et oxyhalogénures des éléments non métalliques.

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Position 2813

Sulfures des éléments non métalliques; trisulfure de phosphore du commerce.

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IV.-

BASES INORGANIQUES ET OXYDES, HYDROXYDES ET PEROXYDES DE METAUX

Sous-Chapitre IV

BASES INORGANIQUES ET OXYDES, HYDROXYDES ET PEROXYDES DE METAUX

CONSIDERATIONS GENERALES

Les bases sont des composés caractérisés par un radical hydroxyle (OH) et qui, sous l'action des acides, donnent des sels; à l'état liquide ou en solution aqueuse, ce sont des électrolytes donnant à la cathode un métal ou un ion analogue (ammonium (NH4+)).

Les oxydes de métaux résultent de la combinaison d'un métal avec l'oxygène. Un grand nombre de ces oxydes peuvent se combiner avec une ou plusieurs molécules d'eau pour se transformer en hydroxydes (hydrates).

La plupart des oxydes sont basiques, car leur hydroxyde se comporte comme une base. Cependant, il existe des oxydes qui, dans tous les cas (oxydes‑anhydrides) ou, ce qui est plus fréquent, dans certains cas seulement (oxydes indifférents ou amphotères), se transforment en sels sous l'action des bases alcalines ou autres; ils constituent les anhydrides d'acides, isolés ou non, correspondant à leurs hydrates ou hydroxydes.

Certains oxydes peuvent être considérés comme résultant de la combinaison d'un oxyde basique avec un oxyde anhydride : on les appelle oxydes salins.

Le présent Sous‑Chapitre comprend :

1) Les oxydes, hydroxydes et peroxydes de métaux, qu'ils soient basiques, acides, amphotères ou salins.

2) Les autres bases inorganiques ne contenant pas d'oxygène, comme le gaz ammoniac du n° 28.14, et l'hydrazine (n° 28.25) ou ne contenant pas de métal, comme l'hydroxylamine (n° 28.25).

Il y a lieu d'exclure notamment du présent Sous‑Chapitre :

a) Les oxydes et hydroxydes qui entrent dans le Chapitre 25, en particulier la magnésie (oxyde de magnésium), même pure, la chaux ordinaire et la chaux hydraulique (oxyde et hydroxyde de calcium impurs).

b) Les oxydes et hydroxydes constituant des minerais (n°s 26.01 à 26.17), des scories, battitures, cendres, crasses, écumes ou autres résidus métallifères (n°s 26.18 à 26.20).

c) Les oxydes, peroxydes et hydroxydes de métaux précieux (n° 28.43), d’éléments radioactifs (n° 28.44), des métaux des terres rares, de l’yttrium ou du scandium ou des mélanges de ces métaux (n° 28.46), ou de mercure (n° 28.52).

d) Les composés oxygénés de l'hydrogène sont repris aux n°s 22.01 (eau), 28.45 (eau lourde), 28.47 (peroxyde), 28.53 (eaux distillées, de conductibilité ou de même degré de pureté, y compris les eaux permutées).

e) Les matières colorantes à base d'oxydes de métaux (n° 32.06), les pigments, opacifiants et couleurs préparés, les compositions vitrifiables et les préparations similaires pour la céramique, l'émaillerie ou la verrerie (n° 32.07), ainsi que les autres préparations du Chapitre 32, constituées par des oxydes, hydroxydes ou bases mélangés d'autres produits.

f) Les préparations opacifiantes pour le matage de la rayonne (n° 38.09) et les compositions pour le décapage des métaux (n° 38.10).

g) Les pierres gemmes et les pierres synthétiques ou reconstituées (n°s 71.02 à 71.05).

Position 2814

Ammoniac anhydre ou en solution aqueuse (ammoniaque).

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Position 2815

Hydroxyde de sodium (soude caustique); hydroxyde de potassium (potasse caustique); peroxydes de sodium ou de potassium.

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Position 2816

Hydroxyde et peroxyde de magnésium; oxydes, hydroxydes et peroxydes, de strontium ou de baryum.

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Position 2817

Oxyde de zinc; peroxyde de zinc.

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Position 2818

Corindon artificiel, chimiquement défini ou non; oxyde d'aluminium; hydroxyde d'aluminium.

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Position 2819

Oxydes et hydroxydes de chrome.

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Position 2820

Oxydes de manganèse.

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Position 2821

Oxydes et hydroxydes de fer; terres colorantes contenant en poids 70 % ou plus de fer combiné évalué en Fe2O3.

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Position 2822

Oxydes et hydroxydes de cobalt; oxydes de cobalt du commerce.

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Position 2823

Oxydes de titane.

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Position 2824

Oxydes de plomb; minium et mine orange.

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Position 2825

Hydrazine et hydroxylamine et leurs sels inorganiques; autres bases inorganiques; autres oxydes, hydroxydes et peroxydes de métaux.

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V.-

SELS ET PEROXOSELS METALLIQUES DES ACIDES INORGANIQUES

Sous-Chapitre V

SELS ET PEROXOSELS METALLIQUES DES ACIDES INORGANIQUES

CONSIDERATIONS GENERALES

Les sels de métaux résultent de la substitution d'un métal ou du ion d'ammonium (NH4+) à l'hydrogène d'un acide. A l'état liquide ou en solution, ce sont des électrolytes donnant un métal (ou un ion de métal) à la cathode.

On appelle sels neutres ceux dans lesquels tous les atomes d'hydrogène sont remplacés par le métal, sels acides ceux dans lesquels subsiste une partie de l'hydrogène remplaçable par le métal, sels basiques ceux qui contiennent une quantité d'oxyde basique supérieure à celle qui est nécessaire pour neutraliser l'acide (par exemple, le sulfate basique de cadmium (CdSO4.CdO)).

Le Sous‑Chapitre V comprend les sels de métaux des acides repris aux Sous‑Chapitres II (acides dérivés des éléments non métalliques) et IV (hydroxydes de métaux à fonction acide).

Sels doubles ou complexes.

Certains sels doubles ou complexes sont spécifiquement dénommés dans les positions n°s 28.26 à 28.41, par exemple : les fluorosilicates, fluoroborates et autres fluorosels (n° 28.26); les aluns (n° 28.33); les cyanures complexes (n° 28.37), etc. Pour les sels doubles ou complexes qui ne sont pas spécifiquement dénommés, voir la Note explicative du n° 28.42.

Il y a lieu d'exclure, en particulier, de ce Sous‑Chapitre :

a) Les sels entrant dans le Chapitre 25, notamment le chlorure de sodium.

b) Les sels constituant des minerais ou autres produits du Chapitre 26.

c) Les composés de métaux précieux (n° 28.43), d'éléments radioactifs (n° 28.44), des métaux des terres rares, de l’yttrium ou du scandium ou des mélanges de ces métaux (n° 28.46), ou de mercure (n° 28.52).

d) Les phosphures, carbures, hydrures, nitrures, azotures, siliciures et borures (n°s 28.49, 28.50 et 28.53) et les ferrophosphores (Section XV).

e) Les sels relevant du Chapitre 31.

f) Les pigments, opacifiants et couleurs préparés, les compositions vitrifiables et les autres préparations entrant dans le Chapitre 32. Les sels de métaux non mélangés pouvant servir en cet état (sauf les luminophores) restent compris dans le présent Sous‑Chapitre. S'ils sont mélangés entre eux ou mélangés à d'autres produits pour constituer des pigments, ils relèvent du Chapitre 32. Il en est de même des luminophores, même non mélangés (n° 32.06).

g) Les désinfectants, insecticides, fongicides, herbicides, antirongeurs, antiparasitaires et similaires (voir la Note explicative du n° 38.08).

h) Les flux à souder et compositions analogues pour la soudure des métaux (n° 38.10).

ij) Les cristaux cultivés de sels halogénés de métaux alcalins ou alcalino‑terreux (autres que les éléments d'optique) d'un poids unitaire égal ou supérieur à 2,5 g, qui relèvent du n° 38.24; lorsqu'il s'agit d'éléments d'optique, ces cristaux sont classés au n° 90.01.

k) Les pierres gemmes et les pierres synthétiques (n°s 71.02 à 71.05).

Position 2826

Fluorures; fluorosilicates, fluoroaluminates et autres sels complexes de fluor.

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Position 2827

Chlorures, oxychlorures et hydroxychlorures; bromures et oxybromures; iodures et oxyiodures.

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Position 2828

Hypochlorites; hypochlorite de calcium du commerce; chlorites; hypobromites.

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Position 2829

Chlorates et perchlorates; bromates et perbromates; iodates et periodates.

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Position 2830

Sulfures; polysulfures, de constitution chimique définie ou non.

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Position 2831

Dithionites et sulfoxylates.

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Position 2832

Sulfites; thiosulfates.

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Position 2833

Sulfates; aluns; peroxosulfates (persulfates).

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Position 2834

Nitrites; nitrates.

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Position 2835

Phosphinates (hypophosphites), phosphonates (phosphites) et phosphates; polyphosphates, de constitution chimique définie ou non.

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Position 2836

Carbonates; peroxocarbonates (percarbonates); carbonate d'ammonium du commerce contenant du carbamate d'ammonium.

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Position 2837

Cyanures, oxycyanures et cyanures complexes.

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Position 2838

[supprimé]

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Position 2839

Silicates; silicates des métaux alcalins du commerce.

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Position 2840

Borates; peroxoborates (perborates).

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Position 2841

Sels des acides oxométalliques ou peroxométalliques.

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Position 2842

Autres sels des acides ou peroxoacides inorganiques (y compris les aluminosilicates de constitution chimique définie ou non), autres que les azotures.

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VI.-

DIVERS

Sous-Chapitre VI

DIVERS

Position 2843

Métaux précieux à l'état colloïdal; composés inorganiques ou organiques de métaux précieux, de constitution chimique définie ou non; amalgames de métaux précieux.

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Position 2844

Eléments chimiques radioactifs et isotopes radioactifs (y compris les éléments chimiques et isotopes fissiles ou fertiles) et leurs composés; mélanges et résidus contenant ces produits.

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Position 2845

Isotopes autres que ceux du n° 28.44; leurs composés inorganiques ou organiques, de constitution chimique définie ou non.

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Position 2846

Composés, inorganiques ou organiques, des métaux des terres rares, de l'yttrium ou du scandium ou des mélanges de ces métaux.

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Position 2847

Peroxyde d'hydrogène (eau oxygénée) même solidifié avec de l'urée.

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Position 2848

[supprimé]

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Position 2849

Carbures, de constitution chimique définie ou non.

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Position 2850

Hydrures, nitrures, azotures, siliciures et borures, de constitution chimique définie ou non, autres que les composés qui constituent également des carbures du n° 28.49.

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Position 2851

[supprimé]

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Position 2852

Composés inorganiques ou organiques du mercure, de constitution chimique définie ou non, à l'exclusion des amalgames.

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Position 2853

Phosphures, de constitution chimique définie ou non, à l'exclusion des ferrophosphores; autres composés inorganiques (y compris les eaux distillées, de conductibilité ou de même degré de pureté); air liquide (y compris l'air liquide dont les gaz rares ont été éliminés); air comprimé; amalgames autres que de métaux précieux.

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