Which factor does NOT affect automatic sampling efficiency?

The factor that does not affect automatic sampling efficiency is the material of the sample bottle. When it comes to the process of automatic sampling, the efficiency refers to how well the sampler can collect representative samples of the water or wastewater.

Flow rate variations are significant because they can influence the amount of sample collected over time, potentially leading to either over- or under-sampling. Adequate programming is essential for the sampler to function correctly, as it determines when and how much sample to take, directly impacting the effectiveness of the sampling process. Environmental temperature can also play a role, affecting aspects like sample integrity and the behavior of certain substances in the sample, which could influence the results.

In contrast, the material of the sample bottle primarily affects factors such as the potential for chemical leaching into the sample or contamination, rather than the actual efficiency of the sampling mechanism itself. Therefore, while the bottle material is important for maintaining sample quality, it does not impact how efficiently automated sampling is conducted regarding timing and volume of sampling.