![]() METTLER TOLEDO offers two electrodes ideally suited to samples with low ionic concentration. One way to mitigate the challenges associated with measurement of pure water is to use a specialty electrode. To minimize this effect, METTLER TOLEDO recommends pH readings in a flow-through cell. Pure water has a pH value of 7.00 at 25 ✬ however, samples are especially prone to CO 2 absorption from the atmosphere, which alters the pH from the expected value of 7.00 toward 5.20 due to carbonic acid formation. The measurement of pH in pure water samples requires special attention due to their low ionic nature (conductivity of 100 μS/cm). Water purity is an important parameter in a number of industries and sectors, including pharma, food and beverage, life science, power generation and many others – which all require pure water for day-to-day laboratory testing and activities. Hence, to address this concern, the American Society for Testing and Materials (ASTM) describes the pH measurement of water and low-ion water samples in the D1293 and D5464 standards. ![]() The pH of water serves as a proxy for its purity, revealing the presence of soluble trace minerals and indicating the likelihood that the water will cause corrosion, can sustain aquatic life or is safe to drink. Why are pH measurements of pure water useful? With recommendations for the best-suited sensors and tips and tricks on best measurement practice, as well as correct electrode maintenance, these documents will help you to obtain reliable results and prolong sensor life. In order to support pH analysis of pure water samples, METTER TOLEDO offers an Application Note and a White Paper. Specialized sensors, such as InLab Pure Pro-ISM or InLab Pure, are required to address the technical aspects of pH measurement of pure water with respect to accuracy, precision and response time. PH measurements with a typical sensor membrane, which has low sensitivity to hydrogen ions, result in compromised accuracy and variable readings. The type of glass membrane, the shape of the glass tip, and the type of junction are all factors that play an important role in the suitability of a sensor to the application. Successful measurements depend on the choice of sensor. This can ultimately cause drift in response time and inaccurate, irreproducible results. For the most complete and up-to-date list of ingredients, please refer to product packaging.Careful measurement of the pH of pure water samples is critical due to their low conductivity, which can lead to fluctuations in the liquid junction potential of the pH electrode system. Ingredients subject to change at manufacturer's discretion. Actual ingredients in a given product option may vary from this list. This list of ingredients represents all options or variants of this product. 1, Water, Allantoin (skin protectants), Phenyltrimethicone (occlusive), Deep Sea Water (60%, Allantoin, Sorbitan Oleate (emulsifier), Dashima Extract (skin-conditioning agents), Sodium Hyaluronate (natural moisturizing factor/ humectants), Panthenol (strengthens skin barrier), Laminaria Japonica Extract, Sodium Acrylate/ Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer (viscosity increasing agents), Polysorbate 80 (emulsifying agents), Panthenol, Caprylyl Glycol, Macadamia Seed Oil (occlusive), Water (solvents), Sea Grape Extract (skin-conditioning agents), Caulerpa Lentillifera Extract, Persimmon Extract (skin-conditioning agents), Sea Water(60%), Cetyl Ethylhexanoate, Cetyl Ethylhexanoate (emollient), Ethylhexylglycerin, Carbomer (viscosity increasing agents), Ethylhexylglycerin (skin-conditioning agents), Butylene Glycol (humectants), Sorbitan Stearate, Isohexadecane, Phenyl Trimethicone, Sorbitan Stearate (emulsifier), Salicornia Herbacea Extract, Ecklonia Cava Extract, Cetearyl alcohol (emulsion stabilizers), Sodium Hyaluronate, Dipropylene Glycol, Sorbitan Oleate, skin-conditioning agents), Adenosine (Improves wrinkles), Glycerine (humectants), Glycerin, Arginine, Macadamia Ternifolia Seed Oil, 2 Hexanediol, Niacinamide, Arginine (pH adjusters), Adenosine, Disodium IDT (stabilizers), Niacinamide (strengthens skin barrier), Caprylyl glycol (emollient), Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Glyc eryl Stearate SE, Polysorbate 80, Dipropylen Glycol (humectants), Carbomer, Butylene Glycol, Tungsten extract (skin-conditioning agents), Isohexadecane (emollient), Caprylic/Capric triglyceride(occlusive), 2-Hexanediol (stabilizers), Disodium EDTA, Caprylic/Capric Triglyceride, Cetearyl Alcohol, Glyceryl Stearate (emulsifier)
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