砷(III和V)在水绵体系中的去除和转化研究

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中图分类号：X52 文献标志码：A文章编号：1673-9868（2025）05-0154-10

DOI： 10. 13718/j. cnki. xdzk. 2025. 05. 013

Removal and Conversion of Arsenic （III and V） in Spirogyra sp. System

ZHANG Jinmei， LIU Ying， WANG Xi， LIU Jing College of Resources and Environment，Southwest University，Chongqing 400715，China

Abstract： In this study，the removal rates of arsenic （II） and arsenic（V） by living Spirogyra sp. under different temperatures （ 10∘C ， 25∘C and 40∘C ）， shading conditions and nitrogen addition were investigated through iluminated microcosmic experiments. The results showed that the removal rate of arsenic （III） could be increased by 3. 9 times as the temperatures increased from 10∘C to 40∘C ，but this treatment had little effect on removal rate of arsenic（V）. The removal rate of arsenic （II） under light condition was

8.1 times of that under shading condition，and the dissolved oxygen generated by photosynthesis could oxidize more arsenic （III） to arsenic（V）. In the presence of nitrogen，the removal rate of arsenic （Il） was reduced to 12.7%-22.1% of the nitrogen-free condition due to the oxidation of NH4+ to NO2- and NO3- consuming oxygen in the system，but the oxidized NO3- could promote the oxidation of arsenic （III） to arsenic （V）. Compared with the short-term experiment，the organic form of monomethylarsenic （MMA） produced in the algae after long-term of growth in a concentration of ，and the contents of various forms of arsenic in the arsenic （II） group was higher than those of in the arsenic （V） group. In view of the significant arsenic removal rate and in vivo organic conversion，Spirogyra sp. can be used as an effective remediation medium for arsenic pollution in water system.

Key words： Spirogyra sp. ;arsenate;arsenite; removal rate; conversion

砷（As）是一种类金属元素，位于元素周期表第IV周期第V主族。（剩余12665字）