摘要
In this paper,the nitrogen forms in newly-formed humic substances,including humic acid (HA),fulvic acid (FA) and humic acid in humin (HAI),were studied by using the ^15N CP-MAS NMR technique in combination with chemical approaches.Results show that the majority of nitrogen in HA,FA and HAI was in the amide form with some presented as aliphatic and/ or aromatic amines and some as pyrrole type nitrogen,although the contents of nonhydrolyzable nitrogen in them differed greatly from each other (15-55%).
In this paper, the nitrogen forms in newly-formed humic substances, including humic acid (HA), fulvic acid (FA) and humic acid in humin (HAI), were studied by using the 15N CP-MAS NMR technique in combination with chemical approaches. Results show that the majority of nitrogen in HA, FA and HAI was in the amide form with some presented as aliphatic and/ or aromatic amines and some as pyrrole type nitrogen, although the contents of nonhydrolyzable nitrogen in them differed greatly from each other (15-55%).
基金
Project supported by the National Natural Science Foundation of China
