Determination of dry residue of drinking water by quartz crystal microbalance method
The dry residue of water characterizes its quality with great completeness, since it contains all impurities, including nonvolatile organic substances. Therefore, the mass of dry residue can characterize the depth of drinking water treatment and is an important indicator of its quality. Currently...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonoumos Educational Institution of Higher Education
2020-11-01
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| Series: | Омский научный вестник |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2020/5%20(173)/99-102%20%D0%97%D0%B0%D0%B2%D0%BE%D0%B4%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9%20%D0%90.%20%D0%93..pdf |
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| Summary: | The dry residue of water characterizes its quality with great
completeness, since it contains all impurities, including nonvolatile organic substances. Therefore, the mass of dry residue
can characterize the depth of drinking water treatment and is
an important indicator of its quality. Currently, this parameter
is determined by the gravimetric method. The determination of
the dry residue mass by this method requires considerable time
for the analysis and the use of a large mass of the substance.
Quartz microweights, the sensitive element of which is a quartz
piezoresonator, do not have these disadvantages. The purpose of
this work is to evaluate the possibility of using the piezoquartz
microweighing method for rapid analysis of drinking water quality.
The use of this highly mass-sensitive method (10–8–10–9 g) can
significantly reduce the mass of water used for the experiment,
and, accordingly, the analysis time, which is determined by the
evaporation time of the substance. An experimental module based
on a quartz piezoresonator is created to perform experimental
studies. The mass-sensitive coefficient of microweights is
determined using calibration measurements. For the given
experimental conditions (temperature 20 ° C, pressure 105
Pa), it
is equal to Сf
= (9,50,5) 10–9 g/Hz.
To assess the possibility of practical use of the piezoquartz
microweighing method, various samples of drinking water are
studied and the results analyzed. Based on the experimental data,
the parameter X is calculated, which characterizes the mass of dry
residue in a liter of water. In the course of experimental studies,
it is found that the tap water used in the experiment is optimally
mineralized by the value of the parameter X, and its purification
using a household filter slightly reduces the amount of dry
residue. When boiling water, some of the substances dissolved in it precipitates, but its mineralization remains satisfactory. During
the distillation process, the amount of dry residue is significantly
reduced, and the water becomes slightly mineralized. The results
obtained in this work are consistent with the known experimental
data. Thus, the piezoquartz microweighing method can be used to
determine the dry residue of drinking water when evaluating its
quality in various technological processes. |
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| ISSN: | 1813-8225 2541-7541 |