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| 改性粘土絮凝后残留的太平洋亚历山大藻(Alexandrium pacificum)毒素变化研究 |
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宋维佳1,2,3,4, 宋秀贤1,2,3,4, 李靖1,2,3, 张悦1,2,3, 申慧慧1,2,3,4, 张培培1,2,3,4, 俞志明1,2,3,4
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1.中国科学院海洋研究所 海洋生态与环境科学重点实验室 青岛 266071;2.青岛海洋科学与技术试点国家实验室 海洋生态与环境科学功能实验室 青岛 266237;3.中国科学院海洋大科学研究中心 青岛 266071;4.中国科学院大学 北京 100049
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| 摘要: |
| 改性粘土法是一种高效、环保的有害藻华应急处置技术，可通过絮凝作用有效去除水体中藻华生物。但利用改性粘土絮凝产毒藻后，水体中胞内外藻毒素的变化情况目前尚不清楚。文章考察了I型改性粘土（MC I）絮凝典型产毒甲藻——太平洋亚历山大藻（Alexandrium pacificum）后，水体中残留藻细胞内和胞外麻痹性贝类毒素（paralytic shellfish toxins，PSTs）含量、组分的变化情况。实验结果表明，MC I对密度为6.11×103 cells/mL的A.pacificum 3小时去除率达62%，水体中残留藻细胞单细胞毒素含量和PSTs组分与对照组无显著差异，但水体中总PSTs含量大大降低，其中由絮凝沉降导致的胞内PSTs被去除量占水体中PSTs总减少量的90%以上。另外，针对MC I对胞外PSTs吸附效果的研究发现，低于0.5 g/L的MC I对胞外PSTs无明显吸附效果，而在利用0.2 g/L MC I絮凝去除大部分亚历山大藻后，水体中胞外PSTs含量无明显变化。由此可以推测该用量下的MC I未造成大量藻细胞破裂向水体中释放毒素。该研究结果将为改性粘土治理有毒甲藻藻华的现场应用提供科学依据。 |
| 关键词: 改性粘土 亚历山大藻 絮凝 麻痹性贝类毒素 |
| DOI：10.11693/hyhz20210100020 |
| 分类号:Q14 |
| 基金项目:国家自然科学基金项目，41976148号；山东省重大科技创新工程项目，2019JZZ010808号；2019年度“泰山学者攀登计划”，泰山学者工程专项经费资助。 |
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| TOXIN REMAINED IN RESIDUAL ALEXANDRIUM PACIFICUM AFTER FLOCCULATION WITH MODIFIED CLAY |
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SONG Wei-Jia1,2,3,4, SONG Xiu-Xian1,2,3,4, LI Jing1,2,3, ZHANG Yue1,2,3, SHEN Hui-Hui1,2,3,4, ZHANG Pei-Pei1,2,3,4, YU Zhi-Ming1,2,3,4
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1.Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Laboratory of Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;4.University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| Modified clay method is an efficient and environmentally friendly treatment technology to harmful algal blooms, which can effectively remove algal blooms from water by flocculation. However, the change of intracellular and extracellular toxins in the water after the flocculation is unclear. Changes in content and composition of the intracellular and extracellular residual paralytic shellfish toxins (PSTs) in water after flocculation with modified clay to Alexandrium pacificum were investigated. Results show that the removal efficiency of modified clay (MC I in type, formulated by kaolinite and poly aluminum chloride) on A. pacificum in density of 6.11×103 cells/mL reached 62% in 3 h in 0.2 g/L dosage. Meanwhile, the single-cell toxin content and component of the residual algal cells in water showed no significant difference from those in the control group. However, the total PSTs content in water was greatly reduced, and the removal amount of intracellular PSTs by flocculation and sedimentation exceeded 90% of the total reduction of PSTs in water. In addition, it was found that the MC I under 0.5 g/L had no obvious adsorption on extracellular PSTs. The extracellular PSTs content in water had no significant change after most Alexandrium cells were removed by 0.2 g/L MC I. Therefore, using MC I at this concentration could not cause a large number of algal cells to rupture and release toxins into the water. The results of this study provided a scientific reference to the field application of modified clay to control toxic dinoflagellate blooms. |
| Key words: modified clay Alexandrium flocculation paralytic shellfish toxins |
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