Maria Inês Portela,^a Sofia Capelo,^{a *} José Paulo Pinheiro^b

^aGrupo de Biogeoquímica - IMAR, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal.

^b Centro Multidisciplinar de Química do Ambiente, Departamento de Química e Bioquímica, FCT / Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.

Received 23 September 2003; accepted in revised form 16 December 2003

The complexation of nitriloacetic acid (NTA) with copper and lead was studied by square wave stripping voltammetry (SWSV) using a mercury iridium microelectrode as the working electrode. The results show that NTA interfere with the measurements, but if the mercury iridium microelectrode is coated with different concentrations of agarose (0.75%, 1.5% and 15% w/v) this interference is greatly minimized. The best results were obtained with 1.5% agarose.

Keywords: NTA, iridium microelectrodes, copper, lead, agarose, PLM.

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^*Corresponding author. E-mail address:scapelo@uevora.pt (Sofia Capelo).