Water Leak Detection
In large industrial closed loop water applications, Phenolphthalein is added to the water system to tint the water pink. The plant can then be walked to determine the leak location. It can be easily disposed with water to drive the water pH below 8, where the pink tine vanishes.
Blood Test Application
Phenolphthalein Indicators are used to perform a presumptive blood test (Kastle-Meyer Test).
A dry sample is obtained with a filter paper or swab. A few drops of alcohols is added followed by a few drops of phenolphthalein indicator. The final step is adding a few drops of hydrogen peroxide.
If the sample turns pink , it is concerned a positive test.
This is considered a non-destructive test. The test has the identical reactions with animal blood, so it is not possible to determine if it is animal or human blood.
Phenolphthalein is used in toys as a diappering ink. The ink it is mixed with sodium hydroxide, as it reacts with the carbon dioxide in the air, it vanishes.
|Phenolphthalein Indicator Solution - 16 oz or 1 gallon|
Phenolphthalein Indicator Solution - 16 oz or 1 gallon
Concrete has naturally high pH due to the calcium hydroxide formed when Portland cement reacts with water. The pH of the water solution present in the pores of fresh concrete may be over 14.
Concrete Carbonation (Natural) will occur when the cement hydration reacts with carbon dioxide in the atmosphere (air). It can reduce the pH to 8 to 9 This reaction is usually restricted to only the surface.
When a 1.0% phenolphthalein solution is applied to normal concrete it will turn bright pink. If the concrete has under experienced carbonation, no color change will be observed.
LaxativePhenolphthalein has been used for over a 100 years as a natural laxative, but has recently has been removed for reasons of carinogenicity.