СУЛЬФАТ САМАРИЯ

Description

Samarium sulfate in the commercial form of octahydrate, Sm₂(SO₄)₃·8H₂O, is an inorganic salt of the rare earth element samarium with sulfuric acid. The crystals range from colorless to pale yellow and are poorly soluble in water. Available in purity grades of 99.9% and 99.999% in terms of rare earth oxide (REO). Synonyms: samarium sulfate octahydrate, samarium (III) sulfate octahydrate.

Basic Attributes

• CAS No.: 13465-58-2
• Chemical formula: H₁₆O₂₀S₃Sm₂ (Sm₂(SO₄)₃ 8H₂O)
• Molecular Weight: 733.03
• Exact weight: 735.77900
• EU number: 237-211-4
• PSA Specifications: 339.76000
• XLogP3: −1.28600

Physico-chemical characteristics

• Appearance: colorless to pale yellow crystals
• Density: 2.93 g/ml at 25 °C (literature data)
• Melting point: 450 °C - with the loss of eight molecules of water of crystallization
• Boiling point: 330 °C at 760 mm Hg. Art.
• Solubility in water: poorly soluble

A note on the data

The wording “450 °C −8H₂O” in the original card does not mean melting in the usual sense, but dehydration: at this temperature, the octahydrate loses all eight molecules of water and turns into anhydrous sulfate. The given value is 330 °C at 760 mmHg. Art. below the dehydration temperature, which for solid salt is not physically consistent with the concept of boiling; the indicator should be considered a reference estimate; thermal calculations are based on the batch passport.

Scope of application

• raw materials for the production of samarium oxide and other samarium compounds
• reagent for the separation and purification of rare earth elements - rare earth sulfates differ in solubility, which is what classical separation schemes are based on
• starting material for doping optical materials, phosphors and technical ceramics with samarium
• laboratory reagent for studying the magnetic and spectral properties of samarium compounds

Safety Information

• Tags: Xi (annoying)
• Hazard statements: H315, H319, H335
• Precautions: P261, P305+P351+P338
• Hazard class code: 36/37/38
• Safety instructions: 26-37/39
• Transport codes: NONH for all modes of transport
• WGK Germany: 3

Storage and transportation conditions

There are no restrictions on transportation: NONH status for all types of transport. Hazard class for the aquatic environment WGK 3 - discharge of residues and rinsing water into the sewer system is excluded; they are collected separately and transferred to a licensed operator. Keep the container tightly closed, the warehouse dry and cool: when heated, the salt loses its water of crystallization, which changes the actual samarium content in the sample. When working with powder, wear gloves, safety glasses and local exhaust; inhalation of dust should be avoided.