The parameter of water hardness is generally not very meaningful for everyone, although we can not live without water, but high hardness of water for our impact is very limited, and for some special industries to understand the hardness of the water Sen is very important, such as textile industry, aquaculture, and centralized urban heating and other industries. Generally speaking the more mineral content in the water, the higher the water hardness.radiation levels geiger counter This is especially true for calcium and magnesium ions, two common substances in water, because calcium and magnesium are usually present in much higher concentrations in natural water than any other multivalent cations, so most tests for water hardness are based on the concentration of both of them. Usually CaCO₃ or gpg as CaCO₃ is expressed as mg / L for hardness. Since alkalinity is also reported as CaCO₃, the results of the two tests can be directly compared.
There are two types of water hardness, permanent and temporary hardness, and both are related to calcium and magnesium ions.
Temporary hardness is staged because it can be reduced by simply boiling the water. This causes the bicarbonate minerals (calcium bicarbonate or magnesium bicarbonate) to form solid deposits, such as those seen on containers, and so the minerals in the water are reduced.
Permanent hardness can only be dealt with using special ways, such as those used in water softening systems,digital nitrate test which are caused by sulfate minerals (calcium sulfate and magnesium sulfate/sulfate).
If it is at home, we can make a simple judgment by soapy water, first find a bottle type container filled with about 350-360 ml of water (probably around 2/3), then add a drop of liquid soap solution (note: not detergent or hand soap, much less soapy water) put the lid on and shake for a few minutes. Then open the lid to see if there is any foam produced, if not, then continue to drop in the soap solution until the foam appears. In this process, we should count the drops of soap, and then you can compare the chart 1 to determine the hardness of the water.
Of course, the use of soap and water test is only a rough, and also a waste of time, want to quickly determine the hardness of water when you can also use titration, the main component is vinylamine tetraacetic acid ester stimulating acetic acid organic chelating agent solution. The reagent will be added drop by drop to a certain amount of test water, and then wait for the color of the water reaction changes, by comparing the final water color to determine the standard of hardness. Although the above two methods are more convenient, when you need accurate data or when the softness of the test is very small, you need to use the function of the water quality testing instrument. Currently there are many water quality testing instruments can detect water hardness, such as calcium and magnesium ions of the special testing instruments,best water hardness test kit or water quality of a number of testing instruments, but no matter which one of its principle is the colorimeter will be a white light beam through the optical filter, the optical filter will only be a specific light or wavelength transmission to the photoelectric detector after the measurement. The parameter of hardness in water quality is obtained by calculating the difference in the amount of transmitted colored light and the measured value of the amount of colored light transmitted by the colored sample that is absorbed, and finally the result is calculated by the meter.