TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Water analysis. Two test tubes of contaminated water. The tube on the right is contaminated with visible sediment. The tube on the left is clear but contains invisible contaminants such as microorganisms or chemicals. Chemical pollutants in water supplies can be from industrial discharges or from agricultural fertilisers or pesticides leaching out of fields into surrounding rivers.
Model release not required. Property release not required.