Deionized Water

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Deionized water is sometimes a problem because the resin cartridges will release organic compounds into the water. These compounds are undetectible to conductivity measurements, and conductivity measurements are one of the main ways that purity of deionized water is determined.

[edit] Recommendations

  • If there is a reservoir for the water system, inspect the reservoir for signs of microbiological growth. If there is any evidence of micobe growth clean the reservoir. Even if there is no sign of growth consider cleaning the reservoir.
  • Check your water by analyzing it for Total Organic Carbon (TOC). If the TOC exceeds 200 ug/L then replace the resin cartridges.
  • Obtain water from another laboratory or a retail store (steam distilled is best) and use that water for blanks. If the blank problem goes away then the problem was definitely the water.
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