When selecting a sample container for environmental testing, which factor is NOT considered?

The focus when selecting a sample container for environmental testing is primarily on factors that ensure the integrity of the sample and its interaction with potential contaminants. Material is critical because different substances can react differently when in contact with various types of containers, which could compromise the sample's accuracy. Size matters as well since it must be sufficient to hold the required volume for testing while also allowing for possible headspace in specific methods. Shape can influence the ease of sampling, mixing, and transportation of samples.

Color is typically not a critical factor in the selection process for sample containers. While container color might have implications for light sensitivity in certain tests (like those involving photodecomposition of samples), it does not have the same level of importance as the other factors related to the chemical behavior of the sample and the container material, adequate volume, or ease of use in sampling scenarios. Therefore, in the context of environmental testing, color is the least relevant consideration when selecting an appropriate sample container.