What are the preservation conditions for Solids samples?

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Multiple Choice

What are the preservation conditions for Solids samples?

Explanation:
Preserving solids by cooling helps slow biological activity and chemical changes that could alter the sample before analysis. Keeping solids at 6 °C or below and analyzing within 7 days keeps the sample representative of what was collected. This approach is chosen because it directly targets the main factors most likely to change solids during storage, without introducing preservation steps that are specific to liquids (like acidifying to pH < 2) or unnecessary delays. Acidification is a common preservation for water samples to protect dissolved constituents, not solids. Analyzing immediately isn’t required for solids, and a 28-day hold is longer than typical for solids and could permit significant changes.

Preserving solids by cooling helps slow biological activity and chemical changes that could alter the sample before analysis. Keeping solids at 6 °C or below and analyzing within 7 days keeps the sample representative of what was collected.

This approach is chosen because it directly targets the main factors most likely to change solids during storage, without introducing preservation steps that are specific to liquids (like acidifying to pH < 2) or unnecessary delays. Acidification is a common preservation for water samples to protect dissolved constituents, not solids. Analyzing immediately isn’t required for solids, and a 28-day hold is longer than typical for solids and could permit significant changes.

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