What is the recommended preservation and maximum storage time for Nitrite samples before analysis?

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Multiple Choice

What is the recommended preservation and maximum storage time for Nitrite samples before analysis?

Explanation:
Nitrite in a collected sample is not stable over time. To get an accurate measurement, it should be preserved by cooling and analyzed as soon as possible. Refrigerate at 0–6 °C and plan to run the analysis within 48 hours. If you wait longer, microbial activity or chemical changes can convert nitrite to nitrate or otherwise alter the concentration, leading to biased results. The presented best approach matches this need: analyze promptly with refrigeration, and do not exceed 48 hours before analysis. The other options either push for longer storage, require unnecessary or inappropriate preservation steps, or demand immediate analysis beyond what is practically required by standard methods.

Nitrite in a collected sample is not stable over time. To get an accurate measurement, it should be preserved by cooling and analyzed as soon as possible. Refrigerate at 0–6 °C and plan to run the analysis within 48 hours. If you wait longer, microbial activity or chemical changes can convert nitrite to nitrate or otherwise alter the concentration, leading to biased results. The presented best approach matches this need: analyze promptly with refrigeration, and do not exceed 48 hours before analysis. The other options either push for longer storage, require unnecessary or inappropriate preservation steps, or demand immediate analysis beyond what is practically required by standard methods.

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