Mercuric Sulfate used in COD testing is considered:

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Multiple Choice

Mercuric Sulfate used in COD testing is considered:

Explanation:
Toxicity of reagents in COD analysis is the key idea. Mercuric sulfate is added to the COD digestion mixture to suppress interference from chloride ions, helping the dichromate in sulfuric acid oxidize organics more accurately. But mercury compounds are well-known hazards: mercuric salts are highly toxic to humans and aquatic life and require strict handling and disposal. That’s why this reagent is classified as toxic rather than non-toxic, inert, or harmless.

Toxicity of reagents in COD analysis is the key idea. Mercuric sulfate is added to the COD digestion mixture to suppress interference from chloride ions, helping the dichromate in sulfuric acid oxidize organics more accurately. But mercury compounds are well-known hazards: mercuric salts are highly toxic to humans and aquatic life and require strict handling and disposal. That’s why this reagent is classified as toxic rather than non-toxic, inert, or harmless.

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