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Piezoelectric screening coupled on line to capillary electrophoresis for detection and speciation of mercury

✍ Scribed by Lisbeth Manganiello; Lourdes Arce; Angel Ríos; Miguel Valcárcel

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
734 KB
Volume
25
Category
Article
ISSN
1615-9306

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✦ Synopsis

Piezoelectric screening coupled on line to capillary electrophoresis for detection and speciation of mercury*

A new methodology is proposed for automation of the monitoring of mercury in water samples. It combines a screening unit for the total amount of mercury, consisting of a piezoelectric flow sensor, with a capillary electrophoresis unit for processing the samples containing a detectable level of mercury. For positive samples, the electrophoretic method developed allowed the speciation of mercury through the formation of the corresponding cysteine complexes. Thus, inorganic mercury, methyl-mercury, diethyl-mercury, and phenyl-mercury can be quantified. A flow system connecting the screening unit to the capillary electrophoresis instrument was developed, and allowed the on-line incorporation of a pre-concentration unit in order to achieve the desired sensitivity in the electrophoretic method. The individual components of the overall set-up functioned together in a synchronised manner.

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✍ Charles E. Kientz; Edwin W. J. Hooijschuur; Udo A.Th. Brinkman 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 114 KB 👁 2 views

The separation performance and sensitivity of an earlier developed system which uses capillary electrophoresis coupled on-line with a flame photomet-Ž . ric detector originally developed for gas chromatography are considerably improved. The liquid junction used in order to decouple the electrical fi