3.4. Remarks

The methods outlined here suffer from disadvantages including sample preparation, contamination, and biofouling. GC is a real proven alternative at very high accuracy, but requires advanced systems for auto‐sampling, transfer of the sample and filtering, avoidance of outgassing, and requires a significant amount of time to obtain a measurement. Forms of ultrafiltration are required for liquid phase detection to produce a clear particle‐free sample for GC and electrochemical detection methods. This filtration will result in biofouling in the long term, a property that must be considered when using such methods for detection in the liquid phase.

Measurements undertaken in the gas phase of the reactor have limited issues with biofouling of filtration systems; however, the presence of H₂S in the biogas can reduce the sensitivity of the sensor systems ²⁷.