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CAS No 7439-91-0 , lanthanum

  • Name: lanthanum
  • Synonyms: (140la)lanthanum; 141137-59-9;lanthanum; Lanthanum atomic absorption standard solution; Lanthanum matrix modifier solution; lantano; 7439-91-0;
  • CAS Registry Number:
  • Transport: UN 3264 8
  • Melting Point: 920 °C(lit.)
  • Boiling Point: 3464 °C(lit.)
  • Density: 6.19 g/mL at 25 °C(lit.)
  • Safety Statements: Poison by intravenous route. Lanthanum and other lanthanoids can cause delayed blood clotting leading to hemorrhages. Has caused liver injury in experimental animals. The dust is a dangerous fire hazard when exposed to flame; can react vigorously with oxidizing materials. Violent reaction with nitric acid, phosphorus (above 400°C), air, halogens. Moderately explosive in the form of dust when exposed to flame or by chemical reaction. Incompatible with H2O, C, N, B, Se, Si, S. See also RARE EARTHS and POWDERED METALS.
  • Hazard Symbols: Ignites spontaneously in powdered form. May delay blood clotting and cause liver injury upon ingestion.
  • EINECS: 231-099-0
  • Molecular Weight: 138.90547
  • InchiKey: FZLIPJUXYLNCLC-UHFFFAOYSA-N
  • InChI: InChI=1S/La
  • Risk Statements: 11
  • Molecular Formula: La
  • Molecular Structure:CAS No:7439-91-0 lanthanum
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7439-91-0 LANTHANUM CHIPS, 2N6; (99.6% REO)

  • Germany ABCR GmbH & Co KG [Manufacturer]
  • Tel: +49 721 95061-0
  • Fax: +49 721 95061-80
  • Address: Im Schlehert 10
    76187 Karlsruhe
    Germany ,Germany
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7439-91-0 L-1000 LANTHANUM METAL

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7439-91-0 Lanthanum, Metal

  • United States GFS Chemicals, Inc. [Manufacturer]
  • Tel: 800-858-9682/ 740-881-5501
  • Fax: 740-881-5989
  • Address: GFS Chemicals, Inc.
    P.O. Box 245
    Powell, OH 43065 ,United States
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7439-91-0 Lanthanum, Metal

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7439-91-0 (0702) LANTHANUM

  • Germany Fox Chemicals GmbH [Manufacturer]
  • Tel: +49.7240.927151/ +49.160.95781845 (Mobile)
  • Fax: +49.7240.927150
  • Address: Fox Chemicals GmbH
    Bockstalstr.10 A
    D-76327 Pfinztal-Germany ,Germany
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7439-91-0 LANTHANUM, CHIPS (UNDER OIL)

  • United States ProChem, Inc. [Manufacturer]
  • Tel: 800-795-8788
  • Address: ProChem, Inc.
    826 Roosevelt Rd.
    Rockford IL 61109 ,United States
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7439-91-0 LANTHANUM METAL

  • United States Noah Technologies Corp. [Manufacturer]
  • Tel: 210-691-2000
  • Fax: 210-691-2600
  • Address: 1 Noah Park
    San Antonio, TX 78249-3419 ,United States
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7439-91-0 Lanthanum, Metal

  • China Beijing Cerametek Materials Co. Ltd. [Manufacturer]
  • Tel: +86-10-6156.6641
  • Fax: +86-10-6156.1674
  • Address: Beijing Cerametek Materials Co. Ltd.
    2-E051, BPE, W. NongLin Rd.,
    FangShan, Beijing, 102400,
    China ,China
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7439-91-0 Lanthanum

  • Canada Treibacher Industrie Inc [, Manufacturer, Distributor/Wholesaler]
  • Tel: 001-416-5352600
  • Fax: 001-416-
  • Address: 515 Consumers Road, Suite 212 Toronto,OntarioCanada
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7439-91-0 LANTHANUM METAL

  • Canada Treibacher Industrie Inc [Manufacturer]
  • Tel: 416-535-2600
  • Fax: 416-535-2602
  • Address: Treibacher Industrie Inc
    67 Mowat Avenue, Suite 332
    M6K 3E3 Toronto, Ontario
    Canada ,Canada
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References of lanthanum
Title: Lanthanum
CAS Registry Number: 7439-91-0
Literature References: La; at. wt 138.90547; at. no. 57; valence 3. Group IIIB (3). A rare earth metal; member of the lanthanide series. Naturally occurring isotopes (mass numbers): 139 (99.91%); 138 (0.09%), radioactive, T? 1.06 ′ 1011 years; known artificial radioactive isotopes: 123-137; 140-149. Estimated abundance in earth's crust: 18-35 ppm. Found in association with cerium and other light lanthanons. Sources of commercial importance are the rare earth minerals monazite and bastnaesite; also found in cerite. Discovery and isoln: Mosander, Pogg. Ann. 47, 207 (1839). Sepn: James, J. Am. Chem. Soc. 34, 757 (1912). Prepn of metal: Mazzi, Atti X Congr. Int. Chim. 3, 604 (1938); Spedding et al., Ind. Eng. Chem. 44, 553 (1952). Toxicity study: Cochran et al., Arch. Ind. Hyg. Occup. Med. 1, 637 (1950). Reviews of prepn, properties and compds: The Rare Earths F. H. Spedding, A. H. Daane, Eds. (Krieger, Huntington, N.Y., 1971, reprint of 1961 ed.) 641 pp; Hulet, Bode, "Separation Chemistry of the Lanthanides and Transplutonium Actinides" in MTP Int. Rev. Sci.: Inorg. Chem., Ser. One Vol. 7, K. W. Bagnall, Ed. (University Park Press, Baltimore, 1972) pp 1-45; Vickery, "Scandium, Yttrium, Lanthanum" in Comprehensive Inorganic Chemistry vol. 3, J. C. Bailar Jr. et al., Eds. (Pergamon Press, Oxford, 1973) pp 329-353; Moeller, "The Lanthanides" ibid. vol. 4, 1-101; F. H. Spedding in Kirk-Othmer Encyclopedia of Chemical Technology vol. 19 (John Wiley & Sons, New York, 3rd ed., 1982) pp 833-854; Chemistry of the Elements N. N. Greenwood, A. Earnshaw, Eds. (Pergamon Press, New York, 1984) pp 1102-1110, 1423-1449. Brief review of properties: G. T. Seaborg, Radiochim. Acta 61, 115-122 (1993).
Properties: White, malleable metal; tarnishes in air. Three crystalline forms: hexagonal a-form, d 6.162, transforms to b-form at 310°; face-centered cubic b-form, d 6.19, transforms to g-form at 864°; body-centered cubic g-form, d 5.97, exists at >864°. mp 920°. bp 3464°. Heat of fusion: 6.201 kJ/mol. Heat of sublimation (25°): 431.0 kJ/mol. E°(aq) La3+/La -2.52 V (calc). Very active; dec water slowly in the cold, more readily on heating. Readily attacked by mineral acids; not attacked by cold concd H2SO4. Burns in air at about 450° producing a mixture of oxide and nitride; forms the hydride on heating in hydrogen. Forms alloys with several metals.
Melting point: mp 920°
Boiling point: bp 3464°
Density: d 6.162; d 6.19; d 5.97
 
Derivative Type: Oxide
Synonyms: Lanthana; lanthanum sesquioxide; lanthanum trioxide
Molecular Formula: La2O3
Molecular Weight: 325.81
Percent Composition: La 85.27%, O 14.73%
Properties: Almost white, amorphous powder. d 6.51. mp >2000°. Insol in water. Sol in dil mineral acids with formation of salts. Absorbs CO2 from the air.
Melting point: mp >2000°
Density: d 6.51
 
Derivative Type: Hydroxide
Molecular Formula: La(OH)3
Molecular Weight: 189.93
Percent Composition: La 73.14%, O 25.27%, H 1.59%
Properties: White, amorphous precip, prepd by adding excess of caustic alkali to a lanthanum salt soln. Strongly basic, displaces ammonia from ammonium salts, absorbs CO2 from air. On dehydration yields La2O3.H2O.
 
Derivative Type: Chloride
Molecular Formula: LaCl3
Molecular Weight: 245.26
Percent Composition: La 56.64%, Cl 43.37%
Properties: Heptahydrate, triclinic crystals. Sol in water or alc. On heating in HCl the anhydr salt (mp 852°) is formed. LD50 in rats: 4.2 g/kg orally; 350 mg/kg i.p. (Cochran).
Melting point: mp 852°
Toxicity data: LD50 in rats: 4.2 g/kg orally; 350 mg/kg i.p. (Cochran)
 
Derivative Type: Carbonate octahydrate
Synonyms: Artificial lanthanite
Molecular Formula: C3La2O9
Molecular Weight: 457.84
Percent Composition: C 7.87%, La 60.68%, O 31.45%
Properties: White, crystalline powder. Practically insol in water. Freely sol in dil mineral acids.
 
Derivative Type: Sulfate
Molecular Formula: La2(SO4)3
Molecular Weight: 566.00
Percent Composition: La 49.08%, S 17.00%, O 33.92%
Properties: Nonahydrate, hexagonal prisms. Prepd by treating a lanthanum salt with a slight excess of sulfuric acid. Dec at white heat. Is the least sol of the rare earth sulfates; soly in water decreases with increase in temp. Insol in alc. Forms double salts with alkali or ammonium hydroxide. Anhydr salt prepd by heating hydrate. LD50 in rats: >5000 g/kg orally; 275 mg/kg i.p. (Cochran).
Toxicity data: LD50 in rats: >5000 g/kg orally; 275 mg/kg i.p. (Cochran)
 
Derivative Type: Nitrate
Molecular Formula: La(NO3)3
Molecular Weight: 324.92
Percent Composition: La 42.75%, N 12.93%, O 44.32%
Properties: Hexahydrate, white deliquesc crystals, mp ~40°, at higher temp forms a basic salt. bp 126°. Very sol in water, alc. Forms double salts with bivalent ion nitrates and ammonium nitrates. Keep well closed. LD50 in rats: 4.5 g/kg orally; 450 mg/kg i.p. (Cochran).
Melting point: mp ~40°
Boiling point: bp 126°
Toxicity data: LD50 in rats: 4.5 g/kg orally; 450 mg/kg i.p. (Cochran)
 
Use: Oxide in glass to improve optical properties. La3+ used in experimental biology as a specific antagonist of calcium: Weiss, Annu. Rev. Pharmacol. 14, 343 (1974).