雷州半岛近海沉积物中腐殖质的分布和腐殖酸特性研究

doi:10.11978/2015129

Abstract

Abstract: Humus and humic acids in offshore sediments have certain indicative effects on marine environmental pollutions, which have great influences on migration and transformation of heavy metals and persistent organic pollutants. The compositions of humus in sediments were determined by the methods of sodium pyrophosphate-sodium hydroxide extraction and potassium dichromate volumetric; and the humic acids extracted by the method of NaOH alkaline extraction were characterized by the methods of elemental analysis, UV, Fourier transform infrared spectroscopy (FTIR), etc. The results showed that the content of humus was very low in surface sediments of Leizhou Peninsula, between 0.26% and 2.36%, with an average of 1.49%, in which fulvic acid accounted for 51%, humin accounted for 35% and humic acid accounted for 14%. Humic acids accounted for 65% of the total humus. Humic acids in marine sediments of Leizhou Peninsula were mainly fulvic acid and small organic compounds. The carbon content was high, and the sulfur content was low with benzene ring, carboxyl, hydroxyl, phenolic hydroxyl, carbonyl, and amine functional groups. Humic substances in offshore marine sediments of Leizhou Peninsula belonged to low degree of humification. These research results provided some guidance for coastal economic development and environmental protection of Leizhou Peninsula.

Key words: Humus, Humic acids, marine sediments, Leizhou Peninsula

CLC Number:

X132

XIE Qun, GUO Chuling, DANG Zhi, SUN Xingli. Research on distribution of humus and characterization of humic acids in offshore sediments of Leizhou Peninsula[J].Journal of Tropical Oceanography, 2016, 35(4): 112-121.

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Research on distribution of humus and characterization of humic acids in offshore sediments of Leizhou Peninsula

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