以5-Br-PAN-S作配位滴定指示剂间接测定矿物中铝和钛  

Study on 5-Br-PAN-S as complexometric titration indicator for determination of aluminium and titanium in the mineral

作　　者：付佩玉[1] 王正祥[1] 

机构地区：[1]济南大学化学与环境工程学院,济南250022

出　　处：《耐火材料》2002年第1期48-50,共3页Refractories

摘　　要：对以 5 Br PAN S作配位滴定指示剂测定矿物中的铝、钛进行了研究。在 pH值为 5 .5时 ,用过量的EDTA与Al3+、TiO2 +充分配位 ,加入氟化铵使两者的EDTA都释放出来 ,测铝钛总量。再取另一份试液加入苦杏仁酸 ,释放出TiOY2 - 中的EDTA ,可测钛量。终点变色敏锐 ,准确度高 ,选择性好。此方法可用于矿物中铝、钛的测定 ,结果满意。The determination of aluminium and titanium in the mineral was investigated using 1 (5 Bromo 2 pyridylazo) 2 naphthol-6-sulphonic acid(5 Br PAN S) as a new complexometric titration indicator.The complex of aluminium and titanium with overmuch EDTA is formed.In the medium of acidty at pH 5.5,when we add NH 4 F,dyadic EDTA is released,the sum of aluminium and titanium is determined.The HO-C 6 H 4 -COOH is added in additional solution,the EDTA in TiOY 2- is released,the titanium is determined.The determining method is accurate and selective,and it has been applied to the determination of aluminium and titanium in the mineral,with satisfactory results.

关 键 词：1-(5-溴-2-吡啶偶氮)-2-萘酚-6-磺酸 铝 钛 配位滴定指示剂 间接测定 矿物 测定 

分 类 号：P575[天文地球—矿物学] P574.2[天文地球—地质学]