The duration and temperature of sample storage is a hotly debated issue, especially for attributes that could quantitatively change during that storage period. For this reason, understanding the mechanisms behind those changes can help the user craft storage conditions that will least affect those attribute values. The choice of sampling container materials may have a dramatic impact on the rate of those changes. In general, the less time the sampled water spends in the container, the more closely it will approximate its original quality at the time of sampling.