http://pupkina.livejournal.com/ ([identity profile] pupkina.livejournal.com) wrote in [personal profile] elisapeyron 2013-10-29 01:48 am (UTC)

оксид лантана ? (lanthanum oxide) - не растворяется даже при нагревании до кипения в солянке. Химикалия не дорогая, может быть даже в вашей лабе.
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