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温度滴定法干扰溶液中铝离子含量
Titrration AApplication Noote H–120
Deetermminaationn of aaluminumm ionn
in aciddic soolutions conttaininng
feerric and ferroous iions
This Applicatioon Note ddescribes tthe determmination oof aluminuum ion down
to approximattely 0.5 g// L in acidicc solutions containing ferric, ferrous, aand
otheer ions whhose hydrooxides do not dissolve in strongly basicc solutionss.
Method description
Principle Solutions
Use is made of the amphoteric property of aluminum Titrant: c(NaF) = 1 mol/L NaF
hydroxide to permit a physical separation from other
solution
metal ions whose hydroxides are not soluble in strongly
basic media. For example, when NaOH or KOH is added Concentrated HCl solution,
to mixed solutions of Al3+ and Fe3+, the Al first ~35% (w/v)
precipitates as Al(OH)3, then redissolves to form c(NaOH) = ~5 mol/L sodium
– 3+
[Al(OH) ] . In contrast, Fe precipitates as «ferrihydrite», hydroxide
4
a poorly-ordered hydrated Fe(III) oxide with a Acetate buffer: pH 4.5 mixed buffer
stoichiometry corresponding to Fe(OH) , and which is solution: Make 130.9 g
3
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