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A simple pH meter Soil pH meter. In general there are three major categories of pH meters. Benchtop pH meters are often used in laboratories and are used to measure samples which are brought to the pH meter for analysis. Portable, or field pH meters, are handheld pH meters that are used to take the pH of a sample in a field or production site. [19]
In and of themselves, pH indicators are usually weak acids or weak bases. The general reaction scheme of acidic pH indicators in aqueous solutions can be formulated as: HInd (aq) + H 2 O (l) ⇌ H 3 O + (aq) + Ind − (aq) where, "HInd" is the acidic form and "Ind −" is the conjugate base of the indicator. Vice versa for basic pH indicators ...
myKOR [15] or Malaysia Korea Technology Center was launched by Prime Minister Abdullah Ahmad Badawi on 20 October 2008. [16] The center purpose is to serve as a gateway for Malaysian organizations and businesses to capitalize and gain access to the pool of Korean IPs and technologies, for the purpose of enhancing and increasing the value of ...
The bottom of a pH electrode balloons out into a round thin glass bulb. The pH electrode is best thought of as a tube within a tube. The inner tube contains an unchanging 1×10 −7 mol/L HCl solution. Also inside the inner tube is the cathode terminus of the reference probe.
An ion-sensitive field-effect transistor (ISFET) is a field-effect transistor used for measuring ion concentrations in solution; when the ion concentration (such as H +, see pH scale) changes, the current through the transistor will change accordingly.
Applications in gaseous and aqueous environment have been studied to detect concentrations of chemical species, solvents, vapors, [8] ions, [9] pH [10] and humidity. The specificity and sensitivity can be controlled by the appropriate choice of materials and their interaction with the analytes, that can achieve even label-free sensors. [11]
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