In Ireland, master's degrees may be either Taught or Research. Taught master's degrees are normally one to two year courses, rated at 60 - 120 ECTS credits, while research master's degrees are normally two year courses, either rated at 120 ECTS credits or not credit rated.
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Total Kjeldahl nitrogen (TKN) is the sum of organic nitrogen, ammonia (NH3), and ammonium (NH4+) in the chemical analysis of soil, water and wastewater. To calculate Total Nitrogen (TN), the concentrations of nitrate-N and nitrite-N are determined and added to the total Kjeldahl nitrogen.