Determination of magnesium in blood serum using a flow-injection system with a potential-scanning electrochemical detector equipped with a thin-film deaerator

Abstract Batch and flow-injection determination of magnesium in blood serum, based on the adsorptive reduction current peak of the Eriochrome Black T—magnesium complex, is described. A potential-scanning electrochemical detector, equipped with a novel thin-film deaerator, allows the successful adaptation of the batch method to a flow-injection system. Using a simple flow system, up to 35 samples h −1 can be processed. The results obtained agree well with those obtained by atomic absorption spectrometry.