Can RO Water Replace MilliQ Water in Preparing Buffers for Molecular Work?

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Discussion Overview

The discussion revolves around the feasibility of using reverse osmosis (RO) water as a substitute for MilliQ water in the preparation of buffers for molecular biology applications. The context includes considerations of water purity, laboratory protocols, and the implications of using different water types in experimental settings.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions whether RO water can replace MilliQ water, noting the difference in conductivity between the two.
  • Another participant suggests that using RO water may be acceptable as long as it aligns with the reporting protocols, emphasizing the importance of transparency in documentation.
  • A participant clarifies that their lab has a MilliQ system but is temporarily unable to use it due to maintenance issues, prompting the consideration of RO water as an alternative.
  • There is a suggestion that if protocols only "suggest" the use of MilliQ water, then RO water might be an acceptable substitute, provided it is reported accordingly.
  • One participant advises maintaining spare parts for critical lab equipment to avoid such situations in the future.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of using MilliQ water versus RO water. While some argue that RO water may be acceptable under certain conditions, others emphasize the importance of adhering to established protocols. The discussion remains unresolved regarding the strict requirements for water purity in this context.

Contextual Notes

The discussion highlights the lack of clarity in laboratory protocols regarding the necessity of using MilliQ water, as well as the implications of using RO water in terms of reproducibility and reliability of results.

kkbniist
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Hi
can we replace MilliQ water (18.2MΩ) with normal RO water (22KΩ) ?
The application is for preparing buffer for a molecular work.

thanks in advance
kkb
 
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I guess so, as long as it does not violate your protocols. In other words, you have to stipulate in your reporting that you did this. Since the amount of information you gave is sparse my answer is equally vague.

Is this is for a lab quiz/project in college? Do the written procedures state that 18.2m Ohms is required? Is some entity paying you to do this work, a client? Generally using milliQ water is done to introduce required repeatability and "bona fides" of an analysis. Only you know what is going on.
 
thanks jim mcnamara
In fact we have a MilliQ system in our lab. But suddenly its membrane needs replacement.
The procurement of the membrane takes some time.
We have many routine molecular biology works that recommends MilliQ water.
Meanwhile, we have an RO system in our lab with.
So I thought of using the RO water which has a much lower conductivity also.

thanks
 
Sounds like you should keep membranes on hand. You said "suggests" MilliQ water. Most lab protocols are not usually worded that way ("suggested"), hmm. If something is "suggested" that implies it is not required, so RO should be fine. Just report it that way.

If something like an RO setup or a MilliQ, is in the critical path of performing work, good practice is considered to be: 'have replacement parts on hand'. Especially for components that regularly need it.
 

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