What is the preservation and storage duration for Sulfate samples?

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Multiple Choice

What is the preservation and storage duration for Sulfate samples?

Explanation:
Preservation of sulfate samples focuses on keeping the sample chemistry stable from collection to analysis. Sulfate is relatively stable in water, so the key step is refrigeration. Keeping the sample cooled to about 6°C (or lower) slows any biological activity and chemical changes, allowing you to hold the sample for up to 28 days before analysis. This approach avoids unnecessary alterations to sulfate speciation or interferences that could come from other preservation methods. Filtration isn’t required for preserving sulfate, and waiting only 48 hours is more restrictive than standard practice when refrigeration supports a 28-day hold. So, cooling and a 28-day storage window best maintain sulfate sample integrity.

Preservation of sulfate samples focuses on keeping the sample chemistry stable from collection to analysis. Sulfate is relatively stable in water, so the key step is refrigeration. Keeping the sample cooled to about 6°C (or lower) slows any biological activity and chemical changes, allowing you to hold the sample for up to 28 days before analysis. This approach avoids unnecessary alterations to sulfate speciation or interferences that could come from other preservation methods. Filtration isn’t required for preserving sulfate, and waiting only 48 hours is more restrictive than standard practice when refrigeration supports a 28-day hold. So, cooling and a 28-day storage window best maintain sulfate sample integrity.

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