50.7 MB (1.3 MB compressed)
4860 x 3645 pixels
41.1 x 31.0 cm ⏐ 16.2 x 12.2 in (300dpi)
ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY
Preparing colorimetric assay solutions. Technician using a pipette to prepare dilutions for analysis (assay) in a colourimeter. Colorimetry is used to determine the concentration of a substance in solution by measuring the amount of a specific wavelength of light that the solution absorbs. This is then compared to a control solution and a known concentration of a similar solution.
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