Chia Mathias Ahii, Kwaghe Mndepawe Jonah
Laboratório de Cianobactérias, Escola Superior de Agricultura Luiz de Queiroz, University of São Paulo, Piracicaba, SP, 13418-900, Brazil,
Environ Monit Assess. 2015 Oct;187(10):606. doi: 10.1007/s10661-015-4829-3. Epub 2015 Sep 2.
Cyanobacterial contamination of public water supply systems is a worldwide problem. The present study investigated water quality and microcystins (MCs) contamination of four public water supply systems in Zaria, Nigeria. The water bodies were eutrophic in the rainy and dry season and supported high phytoplankton biomass with chlorophyll a concentrations generally higher than 20.0 μg/L. The biomass of the predominant species (Microcystis aeruginosa and Anabaena subcylindrica) of cyanobacteria had a significant positive correlation with particulate and dissolved MCs. Dissolved MCs concentrations were higher (>1.0 μg/L) than the maximum permissible limits for drinking water in all the water bodies in the dry season and three of them in the rainy season. These results suggest that there is the need to have a regular monitoring program for these water bodies to prevent acute and chronic health hazards associated with MCs contamination of drinking and irrigation water.
公共供水系统中的蓝藻污染是一个全球性问题。本研究调查了尼日利亚扎里亚四个公共供水系统的水质和微囊藻毒素（MCs）污染情况。这些水体在雨季和旱季均呈富营养化状态，浮游植物生物量较高，叶绿素a浓度一般高于20.0μg/L。蓝藻的优势物种（铜绿微囊藻和圆柱鱼腥藻）的生物量与颗粒态和溶解态MCs呈显著正相关。在旱季，所有水体以及雨季的三个水体中，溶解态MCs浓度均高于饮用水的最大允许限值（>1.0μg/L）。这些结果表明，有必要对这些水体实施定期监测计划，以预防与饮用水和灌溉水MCs污染相关的急性和慢性健康危害。
