In acid solution, the leached amount of Pb showed t1/2 dependence, that is, diffusion-controlled dependence, which is common in lead silicate glasses. The weight loss and leached amount of each component was measured and surface changes observed by SEM. N2 - The leaching behavior of cathode ray tube (CRT) funnel glass containing 23 mass percent of Pb in 0.001N HCl, distilled water, and 0.001N NaOH at 90☌ was investigated using a static method. Bakker, Science 328, 1006 (2010).T1 - Leaching behavior of CRT funnel glass (00)00179-8, Google Scholar Crossref, ISI Whitworth, Physics of Ice ( Oxford University Press, 1999). Pang, Water: Molecular Structure and Properties ( World Scientific, 2014).

Bagchi, Water in Biological and Chemical Processes: From Structure and Dynamics to Function ( Cambridge University Press, 2013). Franks, Water: A Matrix of Life ( Royal Society of Chemistry, 2007). Kauzman, Structure and Properties of Water ( Clarendon Press, 1969). Based on the changing populations as a function of pressure, we are also able to roughly estimate the pressure-dependence of the H-bond network mode and find that its pressure response and thus the blue-shifting are most pronounced at low kbar pressures. In conjunction with an increasing relative population of these short H-bonds versus the long ones (while the population of other water pair classes is essentially pressure insensitive), this explains not only the blue-shift of the H-bonding peak by about 20–30 cm −1 in total from 1 bar to 10 kbar but also the filling of the shallow local minimum of the THz lineshape located in between the network peak and the red-wing of the librational band at 1 bar. Moreover, short double-donor H-bonds have their peak maximum significantly shifted toward higher frequencies with respect to such long H-bonds. Our utmost detailed analysis based on molecular pair classifications unveils that H-bonded double-donor water pairs contribute most to the THz response around 180 cm −1, whereas interstitial waters are negligible. By exactly decomposing the total molecular dynamics into hindered translations, hindered rotations, and intramolecular vibrations, we find that the H-bonding peak arises from translation–translation and translation–rotation correlations, which are successively decomposed down to the level of distinct local H-bond environments. To this end, we employ the instantaneous normal mode approximation to rigorously separate the H-bonding peak from the large background arising from the pronounced librational tail. We, therefore, set out to assess pressure effects on the THz response of liquid water at 10 kbar in comparison to the 1 bar (0.1 MPa) reference, both at 300 K, with the aim to trace back the related lineshape changes to the structural level. THz spectroscopy has been firmly established as a powerful experimental technique to analyze H-bonding in aqueous solutions given that it directly probes the far-infrared lineshape and thus the prominent H-bond network mode around 180 cm −1. The observed increase in coordination number comes from pushing water molecules into the first coordination sphere without establishing an H-bond, resulting in roughly two such additional interstitial molecules at 10 kbar. It has been shown that despite their eye-catching changes, the fundamental locally tetrahedral fourfold H-bonding pattern that characterizes ambient water is preserved up to about 10 kbar (1 GPa), which is the stability limit of liquid water at 300 K. The radial distribution functions of liquid water are known to change significantly their shape upon hydrostatic compression from ambient conditions deep into the kbar pressure regime.

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