Material-specific sanitation — A sanitizer used specifically for vitreous enamel (glass-lined) surfaces is typically which of the following?

Introduction:
Glass-lined (vitreous enamel) reactors and tanks are used for their excellent corrosion resistance and cleanability. However, aggressive chemicals can craze or attack the enamel over time. Selecting compatible cleaners/sanitizers is therefore essential to preserve the lining.

Given Data / Assumptions:

• Surface is vitreous enamel/glass-lined steel.
• Routine sanitation rather than heavy-scale removal.
• Desire to minimize enamel damage while achieving cleanliness.

Concept / Approach:
Mild alkaline cleaners, especially those formulated with sodium silicate, help buffer the solution and deposit a protective silicate film that is compatible with glass surfaces. Strong acids or highly caustic solutions can exacerbate microcracks or leach components from the enamel, so gentler alkalinity with silicate is preferred for regular sanitation.

Step-by-Step Solution:
Identify the sensitive substrate (vitreous enamel).Select a compatible sanitizer/cleaner: weak alkali plus sodium silicate.Avoid harsh extremes that may degrade the lining over time.

Verification / Alternative check:
Manufacturer care guidelines for glass-lined equipment recommend mild alkaline cleaners with silicates and caution against strong acids/bases, especially at high temperatures.

Why Other Options Are Wrong:

• Strong alkalis or strong acids can damage enamel with repeated exposure.
• “None of these” is incorrect because an accepted option exists.
• Unstabilized hypochlorite at low pH can release chlorine gas and is unsafe for routine sanitation.

Common Pitfalls:
Using descalers too frequently; neglecting thorough rinsing that leaves residues affecting product quality.

Final Answer:
Weak alkali with sodium silicate (to protect the enamel)