Hello. I am a Ph.D. student and for the first time, I am using a UV-vis spectrophotometer (ONDA UV-Vis 21). My question is about how to analyse the total amount of organic carbon compounds found in water from HTC process. I thought to analyse the whole spectra, but I do not know how to select it from my instrument. I hope someone can help me in finding more information on how to use this instrument. Thank you in advance.