The Category of Sample Vial
To determine the physical and chemical parameters of natural water, laboratory workers always use polyethylene and borosilicate glass sample vials for common sampling. Furthermore, it is better to use chemically inert material. The frequently-used sample vials have multiple types of narrow mouth, wild mouth, and a screw cap with cork, rubber plug, and ground glass stopper.
These sample vials are easy to buy. If the sample vials are packed in a case and sent to the laboratory for analysis, the case cover must be designed to prevent the corks from loosening, so that the samples will not be spilled or polluted.
Sample Vial for Photoactive Substance
In order to prevent some photoactive substances including algae from light, we mostly use opaque or colored glass vials and keep them in a dark place during storage.
Sample Vial for Soluble Gas or Constituent
When collecting and analyzing samples with a soluble gas, the components will be changed throughout the aeration. A narrow-mouthed vial with a cone ground glass stopper can reduce air absorption to a minimum limit. The most important is that a special seal is required during transport.
Sample Vial for Trace Organic Pollutant
In general, as plastic sample vials will interfere with highly sensitive analysis, laboratory workers always use glass or polytetrafluoroethylene sample vials for trace organic pollutants.