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. 1967 Sep;15(5):1114–1121. doi: 10.1128/am.15.5.1114-1121.1967

Permanent Turbidity-Standards

William G Roessler 1,2, Carl R Brewer 1,2,1
PMCID: PMC547151  PMID: 6077410

Abstract

Permanent turbidity reference standards suitable for measurement of microbial suspensions were prepared by suspending finely divided titanium dioxide in aryl sulfonamide-formaldehyde or methylstyrene resins. Turbidities of these standards, adjusted to a useful range for microbiological and immunological studies, were compared with other reference standards in use today. Tube holders for a Coleman Photonephelometer and a Nepho-Colorimeter were modified to eliminate the water well and to allow use of optically standardized 10-, 16-, or 18-mm test tubes. The standards and the tube holders have been used satisfactorily for more than 12 years.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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