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标题：Microbial Growth and Arsenic Tolerance Ability as Influenced by Inherent Arsenic Loading in Polluted Soils of West Bengal
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作者：T. Biswas ; S. C. Kole
期刊名称：Nature, Environment and Pollution Technology
印刷版ISSN：0972-6268
出版年度：2012
卷号：11
期号：3
语种：English
出版社：Technoscience Publications
摘要：The effect of inherent arsenic loading on microbial growth in polluted soils of Haringhata block in the districtof Nadia, West Bengal as well as the arsenic tolerant ability of the composite cultures of the said soils indifferent concentrations of arsenate (As V ) and arsenite (As III ) at different hours of incubation were studied.Total arsenic loading in the affected soils ranged from 4.70 to 16.56 mg/kg and to that of Olsen extractablearsenic (available arsenic) from 0.74 to 2.98 mg/kg. Total and available arsenic loading adversely affectedthe bacterial and cyanobacterial population, but not the fungi and actinomycetes. Significant negativecorrelations were obtained between total soil arsenic and bacterial population (r = -0. 798** in CFU and-0.800** in MPN method), available arsenic and bacterial population (r = -0.870** in CFU and -0.783** inMPN), total soil arsenic and cyanobacterial population (r = -0.853**) as well as available arsenic andcyanobacterial population (r = -0.857**). As III was more toxic than As V , the growth of the composite culturesappeared up to 20,000 mg/L in As V enriched broth and up to 500 mg/L in As III enriched broth in some of thesoils after 168 hours of incubation. On an average, with increase in incubation period, arsenic toleranceability increased and microbial growth appeared at the higher levels of As concentration. Microbial growthappeared at higher concentration of As V and As III with those soils having comparatively higher inherent Asloading.