A lab result is useful when you can trace it back to the right water, at the right time, by the required method. Give the sample an identity before it leaves the sampling point.
Match the sample to the decision
A grab sample describes a particular time and point. A composite sample combines increments over a time or flow period and can help estimate an internal load where the method and analyte allow it. For regulated discharge testing, follow the applicable requirements and the site’s approved plan. Schedule 12 of Bangladesh’s Environment Conservation Rules, 2023 specifies grab sampling for the applicable discharge testing described there.
Use approved safe access. Follow the laboratory instructions for the bottle, field readings, preservation, transport, and holding time. Record the collector, sample point and ID, date and time, process conditions, and each handoff. Check the lab report for the same ID, method, units, and a reporting limit suitable for the decision.
Follow one sample
ET-01 records O-16 as a grab sample taken at SP-301 at 16:00. The handover shows the result as pending. When the lab report arrives, match it to O-16, check the method and units, and compare it with the applicable criterion. Use the site’s escalation and release procedure if the result or sample record calls for action.
Further reading · Bangladesh Gazette, Environment Conservation Rules, 2023
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