Sub-part-per-billion analysis of aqueous lead colloids by ArF laser induced atomic fluorescence

S. K. Ho, Nai Ho CHEUNG*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

49 Citations (Scopus)


Highly sensitive analysis of aqueous lead carbonate colloids was demonstrated by two-pulse laser-induced atomic fluorescence. The first laser pulse at 1064 nm ablated the sample solution to create an expanding plume. The colloids, being heavier, trailed behind and became concentrated. They were then intercepted by an ArF laser pulse that induced prompt atomic fluorescence at 405.8 nm from the lead atoms. The detection limit for lead was 0.24 ppb. Tap water was analyzed, and lead emissions were clearly observed. Time-resolved spectroscopy revealed that the efficient 193-nm excitation of the analytes was more universal than expected. That was confirmed by the successful application of the technique to colloids and alloys other than lead.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalAnalytical Chemistry
Issue number1
Publication statusPublished - 1 Jan 2005

Scopus Subject Areas

  • Analytical Chemistry


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