Hello everyone,

I am currently working on a research project that involves monitoring the concentrations of sulfur dioxide (SO₂) and hydrogen sulfide (H₂S) gases. However, I am facing significant budgetary constraints and limited access to advanced and expensive analytical instruments in my local area.

I am looking for cost-effective alternatives for the online measurement of SO₂ and H₂S gases that do not rely on high-cost equipment such as gas chromatographs or mass spectrometers. Specifically, I am interested in methods that are:

• Low-cost and affordable for a small-scale lab setup.
• Relatively simple to implement and operate.
• Capable of providing real-time or near-real-time data.
• Suitable for use in field conditions with moderate technical support.

I would appreciate any suggestions on alternative methods, such as colorimetric techniques, electrochemical sensors, or any DIY setups that others have successfully used for similar applications. If there are any low-cost kits or open-source designs available, those recommendations would be very helpful as well.

Any references to relevant studies, papers, or personal experiences would also be highly valuable!

Thank you in advance for your insights and suggestions.