I am working in a construction company which is building hydropower plants in Northern Norway. We are monitoring the Total Hydrocarbon Content (THC) of our process waste water. This particularly important during tunneling as the machines are likely to leak.
At the moment we are sending waste water samples to an analysis company and there are some disadvantages of that, including the price, the delay in information, and the risk of volatile hydrocarbons evaporating during transportation.
I would like to take weekly samples in the field and do the analysis myself. I am an environmental engineer with some background in the laboratory from my time as a student, but I have never tried to find THC before.
I have been trying to find a simple and inexpensive way of measuring the THC in the water, but most of the instruments I have seen on various company websites are very sensitive (measuring in the ppm range) and meant to measure the THC continuously on some industrial flow (like this).
The measuring range should be something like 1-100 mg/L, and I simply cannot find any method or instrument that suits those needs. Do you know of any kind of instrument that can perform this analysis, or a manual method? I am looking for an inexpensive, portable, and simple solution.