Abstract
AbstractGold and gold‐coated cylinder microelectrodes are used as stripping‐based microsensors for trace lead. These gold ultramicroelectrodes exhibit a favorable stripping performance, similar to that observed at common mercury ultramicroelectrodes. Such use of “mercury‐free” electrodes greatly facilitates the development of disposable sensors for lead blood screening programs. Potentiometric stripping analysis at these gold ultramicroelectrodes yields reproducible results for parts per billion (μg/L) concentrations of lead, following short preconcentration periods and using static, nondeaerated solutions. Numerous experimental variables have been characterized and optimized. Repetitive assays of 200‐μl sample drops yield a relative standard deviation of 2.2% (n = 20). The application of the gold ultramicroelectrodes for assays of various real samples is demonstrated, and prospects for their use in decentralized testings are discussed.
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