Lanthanum Expanded View

Lanthanum

Location:  Group 3, Period 6 (lanthanoid)
Atomic Weight:  138.9055
Coordination Number:  6 to 9, 10 for some compounds
Chemical Form in Solution:  La(OH)y(H2O)x+3-y

Storage & Handling:  Keep tightly sealed when not in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not return portions removed for pipetting to container.

Chemical Compatibility:  Soluble in HCl and HNO3. Avoid HF, H3PO4, H2SO4 and neutral to basic media. Stable with most metals and inorganic anions forming an insoluble carbonate, oxide, oxalate, and fluoride and sparingly soluble sulfates (La - Eu exhibit low sulfate solubility). Avoid mixing with elements / solutions containing moderate amounts of fluoride.

Stability:  2-100 ppb levels stable for months in 1% HNO3 / LDPE container. 1-10,000 ppm solutions chemically stable for years in 2-5 % HNO3 / LDPE container.

La Containing Samples (Preparation & Solution):  Metal (soluble in acids); Oxide (dissolved by heating in H2O / HNO3); Ores (carbonate fusion in Pt0 followed by HCl dissolution); Organic Matrices (dry ash and dissolve in 1:1 H2O / HCl or HNO3).

Atomic Spectroscopic Information:
Technique / Line Estimated D.L.* Order Type Interferences
ICP-OES 333.749 nm 0.01/.001 µg/mL 1 ion  
ICP-OES 408.672 nm 0.01/.001 µg/mL 1 ion Th
ICP-OES 412.323 nm 0.01/.001 µg/mL 1 ion Ce, Th
ICP-MS 139 amu 1 ppt n/a M+ 123Sb16O, 123Te16O
*ICP-OES D.L.'s are given as radial / axial view

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