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What are the Conventional Testing Methods for Water Quality Testing Services?

Dec. 19, 2020

Water is the source of life. Whether it is drinking water or rivers, lakes and seas, it is indispensable in life. Regarding water quality testing services, do you know which substances are invisible to the naked eye and what testing methods are used for them? Under normal circumstances, common items for drinking water quality testing include color, turbidity, odor and taste, pH, total hardness, total dissolved solids, and so on.

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Chromaticity testing of water quality testing methods

Chromaticity is an indicator for the quantitative determination of natural water or various water after treatment. Generally, platinum-cobalt standard colorimetry is used for detection, and it is prepared with potassium chloroplatinate and cobalt chloride to make it similar to natural water in yellow color. The standard color column is used for visual colorimetric determination of water samples. Even slight turbidity will interfere with the determination. When determining turbid water samples, centrifuge to make them clear.

Turbidity testing of water quality testing methods

Turbidity is caused by the presence of particulate matter such as clay, sludge, colloidal particles, plankton and other microorganisms in the water. Most of its detection methods use the scattering method (formazin standard), and use the formazin standard under the same conditions The intensity of light scattered by the suspension is compared with the intensity of light scattered by the water sample. The greater the intensity of scattered light, the higher the turbidity.

PH value detection of water quality detection method

The pH value is the logarithmic value of the reciprocal of the hydrogen ion activity in the water, and is a measure of the pH of the water. Generally, the glass electrode method is used for detection. The glass electrode is used as the indicator electrode, and the saturated calomel electrode is used as the reference electrode, which is inserted into the solution to form a galvanic cell. When the hydrogen ion concentration changes, the electromotive force between the glass electrode and calomel electrode also changes. At 25 degrees Celsius, each unit of pH scale is equivalent to 59.1mV electromotive force change value, which is directly expressed by the pH reading on the instrument . There is a temperature difference compensation device on the instrument.

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