特殊用法amino-acid nitrogen1.氨基酸态氮ammoniacal nitrogen1.氨态氮assimilable nitrogen1.可同化的氮formol nitrogen1.甲醛(法测)氮nitrite nitrogen1.亚硝酸盐氮non-amino nitrogen1.非氨基氮non-protein nitrogen1.非蛋白氮oxidizable nitrogen1.可氧化氮protein nitrogen1.蛋白质氮