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Comments
There
are many non-injector causes of a noisy baseline. For example, the detector
or recorder electronics may be a source. If so, the frequency of the noise
will be independent of changes in the flow rate setting, or the pump may
cause regular flow fluctuations. If so, the frequency of the noise will
be inversely proportional to the flow rate setting.
Compounds leached from plastic syringes, vials, and from the cement used to attach needles to syringes can cause noise and drift in electrochemical detectors.
Noise or Drift
A detector baseline that has excessive noise or drift is rarely caused by the injector, at least not directly. But improper operation of the injector can cause gas to collect in the detector cell, making it oversensitive to subtle (normal) changes in ambient conditions.
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