摘要
湿法磷酸试样经溶样后 ,在三乙醇胺存在下 ,铁、铝被掩蔽 ,在 pH 10 .5～ 11条件下 ,铬变酸 2R与镁生成棕红色配合物 ,其最大吸收波长为 5 70nm ,ε=1.3× 10 4L/ (mol.cm)。镁含量在 0～ 2 5 μg/ 5 0mL内符合郎伯 比耳定律。方法回收率为 95 .8%～ 10 0 .5 % ,RSD平均值为 1.5 %。本法用于湿法磷酸成品中微量镁的分析 ,结果满意。
Phosphoric acid by wet process was dissolved,with trie thanolamine to mask iron and aluminum and pH was adjusted to 10.5～11.Comp lex from chromo trope 2R and magnesium was formed,which had the maxium absorptio n at 570 nm,with ε1.3×10~4 (L/mol·cm).Lambert -Beer's Law was obeyed in th e con centration 0～25 μg/50mL of Mg~ 2+ .The rate of recovery was 95.8% to 100.5% ,and the mean precision was 1.5%.
出处
《云南化工》
CAS
2001年第4期21-23,共3页
Yunnan Chemical Technology
关键词
铬变酸2R
湿法磷酸
分光光度法
镁
测定
微量
chromotrope 2R
phosphoric acid by wet process
spec trophotometry
magnesium
