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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