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.
出处
《武汉大学学报（自然科学版）》
CSCD
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
关键词
流动注射
在线预富集
ICP-AES
镧
钆
测定
flow injection, on line preconcentration, ICP AES, DCB arsenazo, micro column, La,Gd
