The incorporation, behaviour and suitability of a simple and cheap home-made coated tubular solid-state silver(I)-selective electrode into the conduits of a flow-injection system is described. With 30 μl samples the flow-injection flow-through electrode system covers a working range up to 5000 mg/l. The system is suitable for the determination of silver(I) in diluted plant solutions from photographic material at a sample frequency of about 80 h−1. This procedure is also characterized by excellent reproducibility (<0.24% for 0.06–76 g/l silver in the original plant solution). The results obtained agree well with results by a standard atomic absorption spectrometric method.