微柱在线预富集FI-ICP-AES测定痕量La和Gd  

DETERMINATION OF TRACE La AND Gd BY FI ICP AES WITH MICRO COLUMN ON LINE PRECONCENTRATION

作　　者：刘怀志[1] 胡斌[1] 余席茂[1] 江祖成[1] 

机构地区：[1]武汉大学化学系

出　　处：《武汉大学学报（自然科学版）》1997年第2期150-154,共5页Journal of Wuhan University(Natural Science Edition)

基　　金：湖北省自然科学基金

摘　　要：以ＤＣＢ－偶氮胂（全名为３－（２－胂酸基苯偶氮）－６－（２，６－二氯－４－溴）－４，５－二羟基－２，７萘二磺酸）为衍生化试剂，使之负载于碳硅凝胶上，并以此填充微柱．在优化的实验条件下，于ｐＨ４．０的ＮＨ３·Ｈ２Ｏ／ＨＣＯＯＨ缓冲介质中实现了Ｌａ３＋、Ｇａ３＋的在线富集分离和ＩＣＰ－ＡＥＳ测定．对影响在线预富集的各种因素进行了考察；方法的富集倍数为１０倍，检出限为μｇ·Ｌ－１级，分析速度为８次／ｈ．此法用于生物标准试样分析。The DCB Arsenazo [3 (2 Arsonophenylazo) 6 (2,6 dichloro 4 bromo) 4,5 dihydroxy naphthalene 2,7 disulfonic acid] used as complex reagent was loaded on the mixture of active carbon silica gel. Main experimental parameters were optimizied. In the buffer solution of NH 3·H 2O HCOOH at pH 4.0, La 3+ ,Gd 3+ could be preconcentrated in a micro column preconcentration system and was determined by ICP AES. Its enrichment factor was 10; the detection limits was at μg/L level, the sampling frequency was 8 times/h. This method has been applied to the analysis of NBS standard sample of tomato leaves and GBW08505 tea leaves with satisfactory results.

关 键 词：流动注射 在线预富集 ICP-AES 镧 钆 测定 

分 类 号：O614.33[理学—无机化学]