摘要
新显色剂２，６－二溴－４－乙氧基偶氮肿在１．５ｍｏｌ·Ｌ－１ＨＣｌＯ４介质中，与Ｂｉ（Ⅲ）生成稳定的深色络合物，最大吸收波长为６３９ｕｍ，摩尔吸光系数为９．６７×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，灵敏度高，常见离子允许量大。Ｂｉ（Ⅲ）在０～２５μｇ／２５ｍＬ范围内符合比耳定律。以试样空白为参比，直接吸光光度法测定铜及铜合金中的铋，方法简便，结果令人满意。
Dibromo-4 -ethoxyarsenazo, a new chromogenic reagent [2-(2-arsenophenylazo) -7-(2, 6-dibromo-4-ethoxyphenylazo)-1, 8-dihydroxy-3, 6-naphtha alenedisulfonic acid ] is reported in this paper. In1.5 mol/L HClO4 medium, 2, 6-dibromo-4-ethoxyarsenazo reacts with Bi(Ⅲ) to form a deep coloredcomplex. The maximum absorbance wavelength of thecomplex is 639um. The molar absorptivity is 9.67×10'L/mol.cm. Relatively large amounts of usualmetal ions are tolerated for determining microamounts of bismuth. Beer's law is obeyed in the rangeof 0-25pg/25mL. This method has been applied tothe determination of bismuth in pure copper andcopper alloy with satisfactory results.
出处
《化学试剂》
CAS
CSCD
北大核心
1995年第5期257-259,共3页
Chemical Reagents
关键词
二溴
乙氧基偶氮胂
铋
光度法
铜合金
dibromo-4-ethoxyarsenazo, bismuth, spectrophotometric dotermination
