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Chain of custody is also used in most chemical sampling situations to maintain the integrity of the sample by providing documentation of the control, transfer, and analysis of samples. Chain of custody is especially important in environmental work where sampling can identify the existence of contamination and can be used to identify the ...
It is used to manage many types of environmental data including laboratory chemistry data (analytical results, QA data, lab sample planning and electronic Chain of Custody), field chemistry data (water, gas, soil), hydrogeological data (groundwater, borehole and well construction, lithological, geotechnical and stratigraphic, LNAPL ...
The LIMS then tracks chain of custody as well as sample location. Location tracking usually involves assigning the sample to a particular freezer location, often down to the granular level of shelf, rack, box, row, and column. Other event tracking such as freeze and thaw cycles that a sample undergoes in the laboratory may be required.
The reduction in the handling of the original evidence lessens the likelihood of deliberate tampering or accidental contamination and reduces chain of custody requirements and overheads. While the chain of custody stops with the presentation, accountability and responsibility remain until the evidence is disposed of.
Sample loss at trace levels may be due to adhesion to container walls and filter surface sites by ionic or electrostatic adsorption, as well as metal foils and glass slides. Sample loss is an ever present concern, especially at the beginning of the analysis path where sequential steps may compound these losses.
According to the statement, “internal sampling” of county drinking water in May found “minimal-to-no detection of the contaminant.” Seminole County government leaders first learned of the ...
Custody transfer requires an entire metering system that is designed and engineered for the application, not just flowmeters. Components of a custody transfer system typically include: Multiple meters/meter runs; Flow computers; Quality systems (gas chromatographs to measure energy content of natural gas and sampling systems for liquid);
An EPA scientist samples water in Florida Everglades. Samples of water from the natural environment are routinely taken and analyzed as part of a pre-determined monitoring program by regulatory authorities to ensure that waters remain unpolluted, or if polluted, that the levels of pollution are not increasing or are falling in line with an agreed remediation plan.