Commonly Used Sample Preservation Techniques for Laboratory Water – Table 10 (Toxicity Testing)

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The table lists the requirements for water sample preservation techniques. The preservation time, container material selection, and preservation measures all depend on the components and properties of the sample. However, real-world water samples vary greatly, so the requirements listed in the table cannot be absolute guidelines. Therefore, each analyst should verify the applicability of these requirements in their specific work, and the methods for sample collection and preservation should be clearly specified when developing analytical method standards.

Furthermore, if there are incompatibilities between the analytical method to be used and the protective agent and container material, it is often necessary to take several samples from the same water body and analyze them using different preservation methods to determine the most suitable preservation method and container.

Common Sample Preservation Techniques – Table 10

(The content of this table only represents general requirements for sample preservation. Due to the complex properties of natural water and wastewater, the stability of each type of sample treated according to the following methods needs to be verified before analysis.)

1 Project to be tested		2 Container Category	3 Save method	4 Analysis location	5 Storage time	6 suggestion
The bioanalytical items listed in this table are not exhaustive and only represent the bioanalytical studies of the animal and plant populations involved.
	Calorific value determination (1) Benthic large invertebrates (2) Phytoplankton (3) Zooplankton	P or G	After filtration, refrigerate at 2-5°C and store in a desiccator.	laboratory	24h	Analyze as soon as possible, no later than 24 hours.
	Toxicity test	P or G	Refrigerate at 2-5℃ and freeze to -20℃	laboratory laboratory	36h 36h	Shelf life varies depending on the analytical method used.