Journal of Ecology and Rural Environment ›› 2016, Vol. 32 ›› Issue (1): 115-119.doi: 10.11934/j.issn.1673-4831.2016.01.019

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Effects of Tartaric Acid, Citric Acid and Malic Acid Removing Lanthanum From Polluted Soils

LIANG Jun-jie1, ZHANG Shi-rong2, LIAO Cheng-yang2, XIAO Luo-yi2, WANG Gui-yin2   

  1. 1. College of Resources, Sichuan Agricultural University, Chengdu 611130, China;
    2. College of Environment/Key Laboratory of Soil Environment Protection of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2015-03-19 Online:2016-01-25 Published:2016-01-27

Abstract:

Effects of tartaric acid, citric acid and malic acid removing lanthanum(La) from polluted soils, relative to concentration of the leachate, duration of leaching and soil pH were investigated through a leaching experiment. Results show that in the vibrating leaching experiment constant in condition(25℃ and 200 r·min-1), La removal increased with rising concentration of any one of the three organic acids, increased and then leveled off with the experiment going on and rose and fell with rising soil pH. It was found that for the three organic acids, the optimal concentration, leaching time and pH was 0.01 g·mL-1, 4 h and 5.0, respectively, in the experiment of removing La. Under such conditions, La removal rate of tartaric acid, citric acid and malic acid reached 57.13%, 62.32% and 54.86%, respectively, in the soil being 300 mg·kg-1 in La concentration, 74.39%, 77.94% and 72.75%, respectively, in the soil being 2500 mg·kg-1 in La concentration, and 17.8%, 23.7% and 24.3%, respectively, in the soil being 463.6 mg·kg-1 in La concentration in a mine area. Taking into account comprehensively La removing efficiency and cost, citric acid should be cited as the optimal leaching agent.

Key words: polluted soil, organic acid, lanthanum(La), leaching, removal rate

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