1000ug/mL THORIUM 125mL

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1000ug/mL THORIUM 125mL

Thorium Expanded View


Location:  Period 7 (actinoid)
Atomic Weight:  232.0381
Coordination Number:  8
Chemical Form in Solution:  Th(OH)3+ and Th(OH)22+

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 H3PO4, H2SO4, and HF, although solubilities may not be a problem depending upon pH and matrix (i.e. - ThF4 is soluble in acids). Avoid neutral to basic media. Th4+ is stable with most metals and inorganic anions forming an insoluble carbonate, oxide, fluoride, oxalate, sulfate, and phosphate in neutral to slightly acidic media.

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.

Th Containing Samples (Preparation & Solution):  Metal (soluble in aqua regia); Oxide (the heated oxide is not soluble in acids except hot conc. H2SO4); Ores (Na2O2 fusion at 480 ± 20°C for 7 minutes, cool, and treat sintered mass with 50 mL cold water and let stand until disintegrated. The mass is transferred to a beaker and acidified with HCl, with 25 mL excess HCl added. Any residue is collected on a Whatman No. 42 filter, dried and ignited to 1000°C in Pt0 crucible and ash treated with H2SO4 / HF and fumed. If residue remains, then treat it by peroxide fusion as described above).

Atomic Spectroscopic Information:  (red text indicates severe at ~ concs.)
Technique / Line Estimated D.L.* Order Type Interferences
ICP-OES 283.730 nm 0.07/.007 µg/mL 1 ion U, Zr
ICP-OES 283.231 nm 0.07/.007 µg/mL 1 ion U, Mo, Ti, Fe, Cr
ICP-OES 274.716 nm 0.08/.008 µg/mL 1 ion Ti, Ta, Fe, V
ICP-MS 232 amu 1 ppt n/a M+  
*ICP-OES D.L.'s are given as radial / axial view

Thorium (Tl) Standards In Our Store

Product Specifications

  • Part #:


  • Description:

    1000ug/mL THORIUM 125mL

  • Matrix:

    5% v/v Nitric Acid

  • Starting Material:


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Associated Certifications: ISO 17034 | ISO 17025


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Traceable to NIST SRMs
Produced under ISO 17025
Produced under ISO 17034
Assayed by validated wet chemical procedures
Assayed by validated ICP-OES procedures
Trace metallic impurities determined by ICP and ICP-MS

And up to 3 YEARS SHELF LIFE with TCT packaging