Arnold Beckman American chemist invented the pH meter,spectrophotometer

Arnold Beckman – inventor of pH meter

Article on Arnold Beckman

Biography & Contributions

Arnold Beckman [Arnold Orville Beckman] was an American chemist born on April 10, 1900 – died on May 18, 2004. Beckman was the inventor of pH mater.

Beckman got many awards and medals in his career like Vermilye Medal in the year of 1987, National Medal of Technology in the year of 1988, National Medal of Science and Presidential Citizens Medal in the year of 1989, Bower Award and Public Welfare Medal in the year of 1992. In 1935 he invented the pH meter, a device which measures the acidity or pH factor in fruit or other materials.

In 1940, the equipment needed to measure light energy in the visible spectrum could cost a laboratory. The new spectrophotometers used a prism to separate light into its absorption spectrum and a phototube to electrically measure the light energy across the spectrum. The allowed the user to plot the light absorption spectrum of a substance, giving a standardized "fingerprint", characteristic of a compound. Beckman discovered the DU spectrophotometer. The DU spectrophotometer was also an important tool for scientists studying and producing the new wonder drug penicillin.

Beckman developed a dosimeter for measuring exposure to radiation, to protect personnel of the Manhattan project. The dosimeter was a miniature ionization chamber, charged with 170 volts. It had a small calibrated scale on top, whose needle was a platinum-covered quartz fiber.

pH Meter

pH is the measure of the level of acidity or alkalinity of any liquid or solution. A specific pH level is to be maintained in all the living organisms so as to sustain in this world. pH is the measurement of hydrogen ion concentration of a liquid, with values ranging from 0-14. These values indicate the level of acidity and alkalinity.

A pH meter is an electronic device used for measuring the pH which is either the concentration of Hydrogen ions in an aqueous solution or the activity of the Hydrogen ions in an aqueous solution. The pH will indicate if the solution is acidic or basic, but is not a measure of acidity or alkalinity. pH meters work in liquids though special probes are sometimes used to measure the pH of semi-solid substances. A typical pH meter consists of a special measuring probe connected to an electronic meter that measures and displays the pH reading.

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