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Neutralizing citric acid with Sodium Nitrite

Dear Sir,
1. What will be the reaction of addition of citric acid ⇦this on eBay or Amazon [affil links] on passivated chemical contain sodium nitrite (pH 9.5-10)for neutralizing and reducing the pH to (6-8)?
2. What is the formula of reaction? and what kind of gases will evolut?
3. Is there any harm on workers while mixing the chemicals for neutralization and subsequent effluent disposal for environmental protection?

We appreciate your reply soon.

Baker Hamad
Industrial Services - Chemical Cleaning - Al-Jubail, Eastern Province, KSA
August 28, 2009

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