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Environmental Modeling

environmental modelingzoom

environmental modelingzoom

The Ultimate Control: Measuring Directly in the Environment

Low levels of consumer product ingredients can occur in river water, soil, sediments, the ocean and a variety of other environmental compartments. Environmental fate scientists estimate these concentrations by using exposure models or by directly measuring the concentration in the environment.

While P&G's exposure models are good, there is no substitute for collecting samples from the environment, bringing them into the laboratory and using analytical chemistry to precisely measure the concentration of consumer product ingredients in the sample. This type of monitoring data is preferable, and used directly in the risk assessments and to refine the exposure models.

P&G scientists have conducted monitoring studies for more than 35 years in these areas of the world:

  • North America (U.S. and Canada)
  • South America (Venezuela and Peru)
  • Europe (U.K., The Netherlands, Italy, Lithuania, Latvia, Estonia)
  • Middle East and Africa (Egypt)
  • Asia (Japan, The Philippines)

Not only does monitoring data help improve exposure models, but it also helps to improve the laboratory fate tests. Monitoring studies often assess product ingredient loss in the following variety of environmental compartments:

  • Municipal wastewater treatment plants
  • Septic systems
  • Sludge amended soils
  • River waters
  • Groundwater systems

Sometimes this real world data indicates that P&G can improve one of the QSPRs or laboratory fate tests to better predict environmental concentrations. This linkage between the computer, the laboratory and the real environment leads to constant improvement in the understanding of P&G ingredient concentration and risk assessment capabilities.

Relevant Publications

Matthijs, E., Holt, M.S., Kiewiet, A., and Rijs, G.B.J., 1999. Environmental Monitoring for Linear Alkylbenzene Sulphonate (LAS), Alcohol Ethoxylate (AE), Alcohol Ethoxy Sulphate (AES), Alcohol Sulphate (AS) and Soap. Environmental Toxicology and Chemistry, 18, pp. 2634-2644.
Matthijs, E., 1998. Trace Analysis of Anionic Surfactants in Laboratory Test Liquors and Environmental Samples. In Cross, J. (Ed.), Analytical Chemistry of Anionic Surfactants, Surfactant Science Series, Volume 73. Marcel Dekker Inc.
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