??????? ???? ????? ???? ???? ???????
???? ?????? ????? ????? ?? ???? ??????? ? tungstate ???? ??? ???? cinchonine gravimetric, ??? ?????? hydchchloride cinchonine ??? ???? ????? ???????? ???? pH ?? 3.0 ~ 4.4 ?????? ?? ??? ????? ?? ????? ?? ????? ???????, ????? ??? ????? ???????? ????? ??? ???? ??????? ???????, ?????, ??? ?????? ???? ???? ???????.
???????? ??????? ?? ?????? ??: ???? ????? ????? 0.1%, ????? ??????????? (1 + 1), ????'??? ????? ??????????? ????? 10% (?????? ?? ??? 1 + 1 ????? ???????????), ????'???? ?????? ????? ??????????? 0.2% NaOH (s) ???? pH ???? ?????
?????? ??:
1. ???? 0.5 ??? ???? ????? ???? 250ml, ??????? ?? ??? ???, ?????? 100 ?"? ?? 60 ~ 80 ℃ ??? ????, 2 ????? ?? 0.1% ????????? ?? ???? ????, ?????? ?? ????? ??????????? ?? ???? ???? ?????;
2. ???? 10 ?"? ?? 10% ????? cinchonine ?? ????? ?? ????, ?? ???? ????? ???? ???? ????;
3. ???? ????? 250ml volumetric ??????, ??? ??????? ??? ??? ?? cinchonine 0.2% ???? ???? ?????, ???? ?????, ?????? ?????? ??? ?? ???? ?????? ???? ??? ????? ?????? ????? ???? ?? ???? ?????, ??? ???? ?? ????? ???? ? 750 ~ 800 ℃ ???? muffle ???? 30 ~ 45 ????, ????? ?????;
4. ????? ????? ????? ?????????? ???? ???? ????? ?? ???????: WO 3 (%) = (W / G) × 100 + C. ???????: W ?????? ????? ???-?????? ??????? (G), G ?????? ????? ????? (g), C ?????? ?????? WO 3 ??????.
????? ??????:
①?? ???? ?? ??????? ?? ??? ???? ????? ????, ???? ???? ???? ????? ?????? ?????.
②????????? ????? 0.1% ???? ????, ????? ??? ????? ???? ???? ?? ??? ???? thiocyanate colorimetry.
?? ?? ?? ????? ??????? ????, ?? ???? ????? ????? ????"?: sales@chinatungsten.com?? ??????:+86 592 5129696.
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