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A battery that is internationally recognized as a potential measurement standard. It was invented by American electrical engineer E. Weston in 1892, hence it is also known as Weston battery.
The positive electrode of a standard battery is a mercuric sulfate electrode, the negative electrode is a cadmium amalgam metal (containing 10% or 12.5% cadmium), and the electrolyte is an acidic saturated cadmium sulfate aqueous solution, which is actually a saturated cadmium sulfate and mercuric sulfate aqueous solution.
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