Universitat de València

Test Kit for anionic surfactant in water

Posted by Universitat de ValènciaResponsive · Patents for licensing · Spain

Summary of the technology

The most remarkable advantages provided by this technology are:
o Simplicity and versatility of the kit, which allows carrying out a high throughput screening or in situ analysis with very short analysis times.
o Low analysis cost, since dyes, organic solvents that generate residues and instrumental equipment are not used.
o High sensitivity of the method, that detect anionic surfactant concentration lower than the maximum residue limit established in most of the environmental legislation.

Description of the tech for sale

Currently, there are different quantitative methods for determining anionic surfactant in water (household, industrial or wastewater and saline water) based on instrumental techniques (chromatography, electrochemistry, spectrometry, etc.). These techniques are expensive and require of expert analysts. Commercial kits use dyes that interact with anionic surfactants. Organic solvents are employed to remove excess dye and surfactant concentration is determined by colorimetric measurements -generally using a spectrophotometer-. Therefore, the use of these kits implies the generation of residues and needs of instrumental laboratory equipments that increases the analysis cost. Researchers from University of Valencia have developed a fast and simple method to determine anionic surfactants in water.


This method is sensitive enough for detecting surfactant concentration lower than the maximum residue limit established in most of the environmental legislation. Visual detection is achieved by measuring the disappearance time (or the thickness) of the foam ring formed after the addition of a pH buffer and a foam enhancer to a water sample. The new kit detects the presence of an anionic surfactant in the field since laboratory measurement equipment and toxic organic solvent are not used.

Main advantages of its use

  • See “New and innovative aspects” section


  • The main application of the technology is in environmental analysis for a simple and fast detection –in laboratories and in situ- of anionic surfactants in water.

Related keywords

  • Industrial Technologies
  • Physical Sciences and Exact Sciences
  • Protecting Man and Environment
  • Biological Sciences
  • Water Transport
  • Clean Industrial Technologies
  • Chemistry
  • Industrial Biotechnology
  • Environment
  • Water Management
  • Drinking Water
  • Rain Water
  • Water in Buildings
  • Industrial Products
  • Genetic Engineering / Molecular Biology
  • Medical Health related
  • Industrial Services
  • Anionic surfactant
  • environment
  • water quality
  • Lab Instruments
  • Analytical instruments
  • analytical chemistry
  • Test Facilities and Methods

About Universitat de València

Public Agency from Spain

The University of Valencia, founded over five centuries ago by the Juries of Valencia, is a modern European public University, open to almost all branches of knowledge: social, economic and legal sciences, Basic experimental sciences, engineering and Tehcniques, health sciences, educational sciences and the humanities.
More than 41,000 undergraduate students, 4,000 postgraduate students, 2,000 students from other universities all over the world, take classes taught by more than 4,000 professors, lectures and researchers at our campuses (more than 440.000 square meters) with the support of over 1,700 administration and service staff.
Our university community is committed to being a university of reference: we are ranked 4º in Europe in receiving Erasmus students and 5ª in sending of students (Ranking Erasmus Mobility); It is fourth spanish university in research at the international level, ranking between 201 and 300, according to Shanghai Jiao Tong University Rankings.
The University of Valencia is working in a wide range of investigative fields. The results of this activity are applied in a variety of productive sectors and social areas. Information of interest for businesses and public bodies about the Scientific and Technological Capacity of the University of Valencia is made available and offered for socioeconomic transfer through its Research Results Transfer Office (OTRI).
The OTRI is a service that manages and assesses in the generation and transfer of University knowledge towards the industry, encouraging the University role as an active agent in the economic and social development; makes easier the access to the University of Valencia research facilities; manage the intellectual property of the research results produced in the University and carry out its valorisation for efficient transfer, and offers orientation of university research groups towards the needs of Business, promoting and guiding effective relationships for exchange of knowledge applied to the needs of social and industrial environment, making easier its information dissemination and transfer.

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