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Development and Evaluation of a Test Strip for Estimating the pH, Chloride and Sulfate Levels in Engine Coolants
Technical Paper
1999-01-0133
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A three-pad dip-and-read test strip has been developed for determining whether the pH, chloride and sulfate levels in engine coolant samples lie within or exceed the recommended ranges. The preferred ranges are 7.5 to 11.0 for pH, below 200 ppm for chloride ion, and below 1500 ppm for sulfate ion. Conditions outside of these limits can lead to corrosion of engine cooling system metal surfaces. A quick and convenient test can determine whether the coolant is suitable for continuing use or should be drained from the system. Extensive performance and stability evaluations of the test pads have been carried out, to ensure that the test strip results agree with reference method results and that test strips are stable under normal storage and use conditions. The test strips were evaluated with different glycol levels, with both ethylene and propylene glycol samples, and under different lighting sources. Test strips were evaluated after storing for varying periods of time at various elevated temperatures and under humidity conditions, to establish whether the strips would retain adequate reactivity with normal use. The results of these evaluations indicate that the strips are adequately accurate and stable for monitoring the condition of engine coolants.
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Citation
Kreiser, T., Dandashli, E., Makowski, E., and Martin, H., "Development and Evaluation of a Test Strip for Estimating the pH, Chloride and Sulfate Levels in Engine Coolants," SAE Technical Paper 1999-01-0133, 1999, https://doi.org/10.4271/1999-01-0133.Also In
References
- Lange's Handbook of Chemistry 14th Dean John 8.82 McGraw-Hill, Inc. 1992
- Engine Coolant Testing, Second Symposium Beal Roy 47 American Society for Testing and Materials 1986
- Merck Index 8th Stecher Paul 1306 Merck and Company 1968
- Tietz Textbook of Clinical Chemistry 2nd Burtis Ashwood 1368 W. B. Saunders Company 1994
- Kreiser, T. H. Makowski, E. Martin, H. R. Hudgens, R. D. “Evaluation of Test Strips for On-Site Monitoring of Coolants in Heavy-Duty Diesel Engines” SAE Technical Paper 960645 1996