The water collected for laboratory analysis is called water sample. The container used to hold the water sample is called a water sample container. Commonly used water sampling containers for colorless hard glass bottle and corked polyethylene bottle two. Their performance and scope of application are as follows.
1, hardened glass spouted bottle due to the glass colorless, transparent, with good corrosion resistance and easy to wash and other advantages, so hardened glass spouted bottle is one of the commonly used water samples containers. But out of the glass composition of silicon, sodium, potassium, boron and other impurities, and glass containers may exist in the dissolution phenomenon, may make the above impurity components into the water sample. Therefore, the glass instrument is not suitable for storing water samples to determine the composition of these trace elements.
2, polyethylene bottles due to polyethylene has good corrosion resistance, impact resistance, unbreakable and does not contain heavy metals and other inorganic components and other advantages, is the use of more water samples containers. However, due to polyethylene has the tendency to adsorb organic matter, etc., long-term storage of water samples, easy to produce bacteria, algae reproduction problems. In addition, polyethylene is susceptible to erosion by organic solvents, so more attention should be paid to its use.
3, specific water samples containers in the water quality testing, some specific components in the laboratory analysis, the need to use specific containers, such as pot ˉs water with dissolved oxygen, oil content and other determinations, belong to this situation. For the use of specific water samples container, to comply with the provisions of the relevant regulations.
Expanded information:
Standard sampling equipment features and uses:
"The national construction standards for radiation environmental monitoring and supervision institutions" requires environmental monitoring configuration : Soil sampler, water quality sampler, atmospheric sampler (standard sampling equipment), is for environmental monitoring, health and epidemic prevention departments to develop a small sampling equipment. The instrument can quickly and accurately collect: soil samples, water quality samples, harmful gas samples, for laboratory tests to provide a basis.