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环境化学  2015 

聚乙烯醇固定化新方法包埋细菌复合胶体颗粒在毒性检测领域中的应用

Keywords: 聚乙烯醇,添加剂,固定化微生物,微生物传感器,毒性检测

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Abstract:

本文将聚乙烯醇(PVA)分别与添加剂碳酸钙(CaCO3)、活性炭(AC)、二氧化硅(SiO2)以及海藻酸钠(SA)掺杂,并对大肠杆菌(E.coli)进行包埋,形成4种PVA包埋细菌复合胶体颗粒.同时,采用以铁氰化钾为探针的电化学方法监测被包埋菌体的活性变化,进而对各复合颗粒中的添加剂含量进行择优筛选.在最优条件下,研究各复合颗粒的储藏时间和方式对菌体的活性影响及各种包埋材料的机械稳定性.将筛选出的最优活性下各包埋细菌复合胶体颗粒应用于3,5二氯苯酚(DCP)的毒性检测,其对DCP的灵敏度排序依次为SA>AC>CaCO3>SiO2.因此,以PVA-SA固定微生物的复合胶体颗粒与PVA固定微生物胶体颗粒分别应用于1—5mg·L-1的乙嘧酚水样的毒性检测,得其抑制率范围分别为6.38%—21.44%和3.21%—16.98%.由此表明,加入添加剂后的PVA固定法对毒物毒性的灵敏度有显著提高,在固定化微生物水质毒性检测领域具有一定的实际应用价值.

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