In the first papers, the notation had the "H" as a subscript to the lowercase "p", as so: The exact meaning of the "p" in "pH" is disputed, but according to the Carlsberg Foundation, pH stands for " power of hydrogen". Another suggestion is that the "p" stands for the Latin terms pondus hydrogenii quantity of hydrogenpotentia hydrogenii capacity of hydrogenor potential hydrogen.
Five of the 64 samples analyzed were promoted as anti-acne soaps. Of these, three were within the range of 9. Table 2 Open in a separate window Nine of the 64 samples, which were marked as ayurvedic soaps had a pH in the range of 9. Three of the 64 samples were promoted for dermatological purpose.
Two out of three had a pH in the range of 9. Homemade soap had a pH range in 9. The sample of imported soap had a pH in the range of 9.
Different varieties of the same brand were also tested. The difference in the pH between varieties of the same brand was within 0. The pH of various varieties of Brand coded A was within 9. Of the 38 samples of shampoos tested, 24 had a pH within the range of 6.
Seven of the 38 samples had pH in the range of 7. Table 3 Open in a separate window Discussion The results of our study revealed that only 3. Upon reviewing these products, it was found that these products have mentioned their pH and the findings of our study were consistent in the pH claimed by them.
The rest of the products with alkaline pH have not mentioned anything regarding their product's pH value. Even those products, which were promoted as anti-acne soaps had a pH above nine.
Since studies have proved that propionibacterium is implicated as one of the factors of pathogenesis of acne and that their count increases on the use of alkaline soap, it is very important that at least these products have a pH consistent with that of skin pH.
Even, the products prescribed for dermatological purposes had an alkaline pH. Ayurvedic soaps, which claimed to be better than other soaps were not skin friendly in the aspect of their pH. Also, only 3 samples of those tested had a pH in keeping with the normal skin.
Also, only 2 samples of those tested had a pH corresponding to that of the skin pH. The difference may be due to greater accuracy of the pH meter used in our study when compared to the pH paper. Acid balanced shampoos are recommended generally by experts and in our study we found that When compared to soaps, shampoos are better in respect to their pH.
The soaps and shampoos commonly used by the population at large have a pH outside the range of normal skin and hair pH values. Therefore, it is hoped that before recommending soap to patient especially those who have sensitive and acne prone skin, due consideration is given to the pH factor and also that manufacturers will give a thought to pH of soaps and shampoos manufactured by them, so that their products will be more skin and hair friendly.
This is the first study in India, which used a pH meter to measure the pH of commonly used soaps and shampoos instead of pH paper. Hence, it is more accurate. Footnotes Source of Support:Detergent Residue Testing Using a pH Meter, pH indicator, or Test K it.
Please test any pH paper you intend to use with these detergents to determine if there is any interference before adapting this procedure for use with pH paper. Alconox, Inc. The Leader in Critical Cleaning. pH measurement is used in a wide variety of applications: agriculture, wastewater treatment, industrial processes, environmental monitoring, and in research and development.
pH is a measure of the acidity or alkalinity of a solution. The pH value states the relative quantity of hydrogen ions (H+) contained in . Tips.
The pH range goes from 1 to 14, but, as most soil isn't ever either extreme, many test strips will indicate a range between 4 and 9. The soil pH indicates nutrient levels in the soil.
Chlorine and pH Test Kits and Test Strips Fisherbrand™ Plastic pH Strips Laboratory grade plastic pH strips in durable and easy to open flip-top vials. A precise pH determination can be made by making an electromotive force (emf) measurement of a standard buffer solution whose pH is known, and then comparing that measurement to an emf measurement of a sample of the solution to be tested.
Oct 22, · How to Measure the pH of Water. In this Article: Article Summary Using a pH Meter Using Litmus Papers Understanding pH Community Q&A Testing the pH of water tells you how acidic or basic the water is at the moment of testing.
Pure, unpolluted water normally has a pH level of 7, which is neutral (neither acidic nor basic).Views: K.