Location: Period 7 (actinoid)
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.)|
1000ug/mL THORIUM 125mL
5% v/v Nitric Acid
Associated Certifications: ISO 17025
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✔ Assayed by validated ICP-OES procedures
And up to 3 YEARS SHELF LIFE with TCT packaging