Hi,guys,now i am sharing ASTM D6517-18,Standard Guide for Field Preservation of Ground Water Samples.
ASTM D6517-18 covers methods for field preservation of ground water samples from the point of sampling through receipt at the laboratory.
Ground water samples should be preserved in the field atthe time of sample collection using physical means to prevent sample container breakage or temperature increases, and chemical means to minimize changes in ground water sample chemistry prior to laboratory analysis.
Ground water samples should be preserved immediately upon collection to minimize the time for chemical alteration of sample chemistry to occur (3). An exception is those samples requiring field filtration, which should be field-filtered first,then chemically preserved.
Records should be kept for the forms of sample preser-vation used for ground water samples. Report the following in accordance with Guide D6089 and record as a minimum. the following general information (data).
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