摘要
在NH_4Ac溶液中加入标准Ba^(2+)溶液沉淀SO_4^(2-)用标准K_2CrO_4溶液滴定过量Ba^(2+)。过量的CrO_4^(2-)在交流示波极谱图上出现切口指示终点,间接求出天然水中SO_4^(2-)含量。
The sulfate ion is precipitated as barium sulfate by the addition of a known amount of a standard barium solution,the concentration of barium remaining in solution is then determined by oscillopolarographic titration with a solution of standard potassium chromate in a buffer solution at pH 6(HAc-NH4Ac).The end point is indicated by the appearance of incision of chromate ion. The proposed method is very simple .accurate and rapid.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1993年第5期554-555,共2页
Chinese Journal of Analytical Chemistry
关键词
天然水
硫酸根
示波极谱滴定
Natural water,Sulfate ion.Oscillopolarographic titration.
