The limitation of the Macro Kjeldahl method for determining nitrogen in the coal is that it requires a long time and has a potential loss of nitrogen from the system, which results in low nitrogen value, or still, no detection can be achieved at all.
针对传统开氏定氮法测定煤中氮含量消化时间过长,导致测定结果偏低有时甚至测不出结果的缺陷,进行了反复地分析、研究,并对其进行了改进。