›› 2019, Vol. 31 ›› Issue (4): 616-623.DOI: 10.3969/j.issn.1004-1524.2019.04.14

• Environmental Science • Previous Articles     Next Articles

Effects of humic acid particles with different sizes on available cadmium in soil

ZOU Chuan1, GUO Bin2, LIN Yicheng2, FU Qinglin2,*, LIU Chen2, DING Nengfei2, LI Ningyu2, LI Hua2   

  1. 1. School of Environment and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China;
    2. Institute of Environment, Resources, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2018-12-12 Online:2019-04-25 Published:2019-04-19

Abstract: In order to explore the effect and mechanism of humic acid on available cadmium in soil, four kinds of humic acid particles with different sizes were obtained by different grinding treatments, and were analyzed by means of adsorption experiment, scanning electron microscopy and infrared spectroscopy. Furthermore, the effects of their soluble and residue fractions on Cd adsorption of soil were studied by pot experiments. The results showed that both the Cd adsorption curves of original humic acid and the residue fractions fitted well with the Langmuir adsorption model. Compared with original humic acid, the residue fractions significantly (P<0.05) decreased soil pH and soil available Cd content. Correspondingly, the soluble fractions added into soil increased the soil available Cd content. Scanning electron microscopy and infrared spectroscopy indicated that the specific surface area and carboxyl group of the residue fractions were increased with the smaller particle size, while the content of phenolic hydroxyl group of the soluble treatment was increased. In conclusion, the grinding-induced decrease in particle size of humic acid strengthened the adsorption effects on Cd for the residue fractions, and mobility effects on Cd for the soluble fractions, respectively.

Key words: humic acid, filtrate, filter residue, dissolved organic matter, available Cd, functional group

CLC Number: