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Laboratory
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Laboratory

Sample containers, and the measurement they are part of

By Dwight Davis, Founder

Updated

On this page7
In a laboratory the container can change the result. Material leaches in, analytes adsorb onto the wall, and the number you report is wrong with nothing downstream able to catch it. That is why the regulations name the material.

Getting started

Before the first sample.
Who this is forWhat to establish before ordering

The container

Why the material is specified for you.
Why the material changes the resultMaterial by analyte, in practiceWhat we actually stock for this

Handling

Preservation, holding time and the chain.
Reading Table IIPreservation, and what it does to the containerLabeling and chain of custody

What goes wrong

Named failures, with the cause for each.
The number is wrong and nothing looks wrongThe holding time expiredThe sample cannot be identifiedCross-contamination between samples

Closures and seals

What the cap has to do here.
What the cap has to do hereLiners, and why PTFE keeps appearing

The lab as a workplace

The Chemical Hygiene Plan.
The Chemical Hygiene PlanLabeling at the bench

Tools and directories

Things to use rather than read.
The container decision, as a checklist
Written from 40 CFR 136.3 Table II and 29 CFR 1910.1450. Every page names its source.