Earth tones-- : the book : federal science for sustainable development earthtonesbookfe00cana Year: 2000 When pond scum is poison Health Canada Most of us can identify blue-green algae, or cyanobacteria (which can vary in colour from olive-green to red), as pond scum when a mass of it has risen to the surface of warm, shallow water that is slow-moving or still. This scum is called a bloom. What we can't identify by looking at the bloom is whether the cyanobacteria is storing naturally produced toxins in its cells. Mot all blooms are toxic, but we have to assume they are until tested, says Mi
Earth tones-- : the book : federal science for sustainable development earthtonesbookfe00cana Year: 2000 When pond scum is poison Health Canada Most of us can identify blue-green algae, or cyanobacteria (which can vary in colour from olive-green to red), as pond scum when a mass of it has risen to the surface of warm, shallow water that is slow-moving or still. This scum is called a bloom. What we can't identify by looking at the bloom is whether the cyanobacteria is storing naturally produced toxins in its cells. Mot all blooms are toxic, but we have to assume they are until tested, says Michele Qiddings, Senior Evaluator, Drinking Water Section, Health Canada. So we need tests that can be done routinely on limited resources—tests that are easy to use and that don't take a lot of time. Qiddings is involved in two projects to develop such tests. She works with Health Canada researchers on the Environmental Health research project which modified a costly and time-consuming lab test. The result is a readily accessible and affordable analytic methodology to determine quantitatively the total amount of cyanobacteria hepatotoxins (toxins that affect the liver) in a water supply inhabited by these blooms. The methodology is ready for inter-laboratory testing in the summer of 2000 as part of an interprovincial survey. -^H (. 8 )
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