Top 10 Unstable Elements
• Ppb stability study [ Full article ]
Elements studied at the ppb level in LDPE bottles.
| 1. |
Mercury (Hg) - not stable long enough to measure |
| 2. |
Gold (Au) |
| 3. |
Silver (Ag) |
| 4. |
Palladium (Pd) |
| 5. |
Platinum (Pt) |
| 6. |
Tantalum (Ta) |
| 7. |
Iridium (Ir) |
| 8. |
Molybdenum (Mo) |
| 9. |
Tin (Sn) |
| 10. |
Hafnium (Hf) |
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Container Transpiration
• Facts about your bottles [ Full article ]
| • |
Transpiration occurs around the bottle opening and not through the bottle as previously thought. |
| • |
Taping the bottle has no influence upon the transpiration rate. |
| • |
Bottles that are half full and opened periodically have the highest transpiration rate. |
| • |
Opening the bottle periodically greatly increases the transpiration rate. |
| • |
Smaller bottles transpire faster. |
| • |
30 ml bottles can not have a 1 year expiration date if certified to an uncertainty of ≤ ±0.6 % relative. |
| • |
Transpiration Controlled Technology™ (TCT) totally eliminates transpiration. |
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Everyday Contaminants
• Contamination from the analyst [ Full article ]
| 1. |
Sweat contains Ca, Mg, Pb, K, NH4+ , SO4-2, PO4-3, and Cd (for those who smoke). |
| 2. |
Cosmetics can contain high concentrations of Al, Be, Ca, Cu, Cr, K, Fe, Mn, Ti, and Zn. |
| 3. |
Some hair dyes contain Pb(OAC)2. |
| 4. |
Dandruff shampoo can contain significant levels of Se. |
| 5. |
Eye make-up may contain Hg as a preservative. |
| 6. |
Calamine lotion is almost pure ZnO. |
| 7. |
Watches and jewelry contain an assortment of elements and should not be worn in the laboratory. |
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