The Orion 9416BN Silver/Sulfide Half-Cell Electrode and Orion 9616BNWP Sure-Flow™ Combination Silver/Sulfide Electrode measure silver and sulfide ions in aqueous solutions quickly, simply, accurately, and economically. Because of the extreme insolubility of silver sulfide, the two ions are virtually never present in solution together. This electrode also performs low-level cyanide and halide titrations.