Desilvered lead is freed of bismuth according to the Betterton-Kroll process by treating it with metallic calcium and magnesium, which forms a bismuth dross that can be skimmed off.
Based on Equation 6, the diffusion coefficients for Oregon green and Atto 655-maleimide at measurement temperature, 37°C, can be calculated (Dross et al., 2009): (6) D (T 2 ) = D (T 1 ) · T 2 T 1 · η (T 1 ) η (T 2 ), where T1 and T2 are the compared temperatures (298.15 K and 310.15 K, respectively), D the diffusion coefficient (cm/s), and η the viscosity of water (Pa·s) at these temperatures.
Inevitably, there is a lot of dross, but there are gems too which can be downloaded free.
Separation of bismuth from lead by the Betterton Kroll process involves the formation of high-melting calcium or magnesium bismuthide (Ca3Bi2 or Mg3Bi2), which separates and can be skimmed off as dross.
The good news for Old Trafford in the new year is that entertainment might be making a reappearance, in which case all the dross from the end of last year can be quickly forgotten about.
To be fair, some decent performances can be found amid the dross, including spirited turns from Ryan Carlberg as the team's jaunty leader, Kate Vernon as the college's scheming president and, somehow, the esteemed Bruce Davison as a veteran coach.
Still, it can be hard separating jewels from dross in the patchy history of art in Britain.
Compounds are formed with bismuth that have higher melting points and lower densities than lead and thus can be separated as a solid dross.
The web is a massive massive resource for education or it can be a source for brain dead dross.
