Ключевые слова: analysis, analyze, analyzing, bacteria, bacterium, biological, biologist, biology, chemical, chemist, chemistry, collecting, danger, ecologist, ecology, environment, environmental, equipment, examining, experiment, expertise, filtration, health, industrial, industry, laboratory, lake, man, measurement, method, nature, outdoors, pollution, problem, protective, protective suit, quality, research, river, safety, sample, sampling, science, scientific, scientist, study, test, toxic, water, working,