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Laboratory evaluation of algicidal biocides for use on constructional materials 1. an assessment of some current test methods



Laboratory evaluation of algicidal biocides for use on constructional materials 1. an assessment of some current test methods



International Biodeterioration Bulletin 17(4): 113-123



A number of tests are described for the laboratory evaluation of algicidal biocides for use on construction materials. The streaked plate, algal lawn and liquid culture methods all suffer disadvantages relating to interpretation and extrapolation of results although the liquid culture method may be useful in preliminary screening of candidate biocides. A novel technique employing building materials such as natural stone and mortar, dampened by contact with moist vermiculite offers a more realistic assessment of biocide performance. The technique provides conditions which permit interaction between substrate, organism and biocide, and enables residual toxicity to be evaluated by re-challenge with fresh algal inoculum. It is possible that the method could be used to determine the concentration of biocides which might be effective in service.

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