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ÕæÇ¿±ØÊ¤: ½ð±Ò+1 2014-02-13 10:17:20
ÕæÇ¿±ØÊ¤: good 2014-02-13 10:17:28
annahit: ½ð±Ò+30, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-02-14 18:12:56
After complete digestion the solution of perchloric acid was  dropped to and heated on heating plate   for the  hydrofluoric acid  driving  off to prevent the corrosion  of test equipment. Then cooling to room temperature, the solution was placed in a 50mL volumetric flask and treated with 5% nitric acid to  constant volume  for testing¡£
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