Sample Storage for Oil Concentration Measurement

If possible, perform the sample analysis as soon as the sample is obtained. If immediate analysis is not possible, as with certain samples (normally for regulatory reporting) that are sent onshore for analysis, then acidify the sample to pH 2 using hydrochloric acid (HCl) to 

In the case of analysis being done immediately (for daily measurement), the sample should be acidified only if the approved analysis procedure requires it. 

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