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Annual Toys For Tots Aid
For the third year running, Inorganic Ventures will be donating a percentage of every order taken in December to the Marine Toys For Tots Foundation. We thank you for your continued support and we wish you and yours a happy holiday season.
Analytical Quick Tip
Replace your stock standard solutions on a regular basis. This is crucial due to the changing concentration of the standard through transpiration and due to the possibility of an operator error through general usage. A mistake may occur the first time you use the stock standard solution, or it may never occur. However, the probability of contamination caused by human error increases with every use. Therefore, most regulatory agencies recommend at least annual replacement.
PPB Stability in LDPE Bottles
A study was conducted to determine the stability of elements at the part-per-billion level in low density polyethylene (LDPE) bottles. In work reported previously, it was found that LDPE is the cleanest container material (see The Purity and Cleaning of Plastics for details) for trace metals solutions.
During the study, the following was observed:
- The 1% nitric acid solutions of the alkali, alkaline, and rare earth elements do not show any instability at the 2-100 ppb level in LDPE.
- The majority of elements studied were found to be stable for 1 year at the 2-100 ppb level.
- Silver (Ag) is the only unstable element found that is stable at the 2 ppb level. Ag's instability is most likely linked to its chloride chemistry (photo-reduction, precipitation).
- Gold (Au) and Mercury (Hg), which are similar in stability, are the most unstable elements and are the only elements unstable at all of the concentration levels studied. They are also reported to stabilize one another.
- Platinum (Pt), Tantalum (Ta), Molybdenum (Mo), Tin (Sn), Hafnium (Hf), and Iridium (Ir) were originally present as a fluoride or chloride complex.
Excerpts from 'Part-Per-Billion Stability Study' -- read the full article here.
Sample Preparation Guide: Magnesium · NEW ·
The fourth installment of our Sample Preparation Guide features detailed preparation tips for samples containing magnesium.
Nitric Acid Oxidations · NEW ·
Dr. Gaines shares some information regarding the fundamentals of nitric acid oxidations.
ICP Operations Guide · COMPLETE ·
A clear 16-part online guide intended for anyone preparing samples and standards for measurement using ICP. Topics cover many day-to-day tasks required by all operators.
Reliable Measurements: A Guidebook for Trace Analysts · COMPLETE ·
An essential 17-part online guide for chemical analysts. Topics cover all phases of sample collection, preparation, measurement, and data analysis.
Santa gave a book all about Helium to a chemist that loved to read. But the chemist was a little disappointed in the gift -- after all, it was just a little light reading.
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| Elemental Spotlight |
Niobium
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 concentrated HCl and dilute HF / HNO 3. Avoid neutral to basic media. Unstable at ppm levels with metals that would pull F - away (i.e. - Do not mix with Alkaline or Rare Earths or high levels of transition elements unless they are fluorinated). Stable with most inorganic anions provided it is in the chemical form shown above.
Stability: 2-100 ppb levels stable (alone or mixed with all other metals that are at comparable levels) as the NbOF 5-2 for 5 months in 1% HNO 3 / LDPE container. 1-10,000 ppm single element solutions as the NbOF 5-2 chemically stable for years in 2-5% HNO 3 / trace HF in an LDPE container.
Nb Containing Samples (Preparation & Solution): Metal (soluble in HF / HNO 3); Oxide - very resistant to all acids including HF (fusion with K 2S 2O 7, KOH, or Na 2CO 3); Organic Matrices (dry ash at 450°C in Pt 0 and dissolve by fusing with Na 2CO 3 or K 2S 2O 7).
Excerpt from Inorganic Ventures' Analytical Periodic Table: Includes detailed analytical data for more than 70 elements.
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The IV Line · News from the Lab · Holiday Edition 2006 (Volume 19)
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