Turbidity analysis is an optical measurement of scattered light. When light is passed through a water sample, particles in the light path change the direction of the light, scattering it. If the turbidity is low, most of the light will continue in the original direction. Light scattered by the particles allows the particles to be detected in the water, just as sunlight can illuminate dust particles in the air.

Reliable low level turbidity measurements are a critical water quality measurement for regulatory compliance and monitoring filtration efficacy. To obtain dependable results, careful attention to measurement technique is critical. Maintaining tubes with good optical qualities, minimizing stray light and careful sample handling are all important factors. A well designed instrument is only effective if it is accurately calibrated. Finally, referencing an ultra-pure low level turbidity standard, such as a blank, while testing samples will help preserve and verify a good low level calibration testing program.

Reprinted with Permission from www.lamotte.com