Five 24 g aliquots of the washed powders were leached statically at 90 C in 600 mL distilled water within airtight stainless steel vessels. At corrosion times of 5.7 and 12.2 a, single experiments wereinterrupted to collect altered glass for the spectroscopic investigations.The wet glass was separated from the aqueous solution and
stored at 100% humidity in a refrigerator (T = 0–10 C).