【摘要】 考察了EDTA络合滴定法中各影响因素。结果表明,加入1+1乳酸2 mL即可掩蔽溶液中的Ti4+离子;EDTA的加入量以相对于铝过量50%为宜;选用二甲酚橙作指示剂,通过控制溶液pH值可使滴定终点敏锐而准确;加热煮沸2 min～2.5 min可使络合反应完全。采用本法测定盐酸浸出液中的铝,RSD(n=6)仅为0.625%～1.266%,加标回收率100.1%～102.3%,测定结果比较稳定。更多还原

【Abstract】 It was needed to accurate determination of aluminum content for compehensive utilization of red mud.In the paper,the influence factors of EDTA complexometric titration of aluminum in hydrochloric acid leaching solution of red mud were investigated.The results showed that Ti4+ ion could be covered sufficiently by adding 2 mL of 1+1 lactic acid.When addition of EDTA was over 50% and xylenol orange was used as an indicator,a sharp and accurate titration results could be got by adjusting the pH value of solution.And boiling 2 min~2.5 min was enough to complete the complexation reaction.On the base of 0.625%~1.266% RSD(n=6) and 100.1%~102.3% recovery rate,the method of EDTA complexometric titration was accepted.更多还原