1. Look: hold a glass of water with high transparency. Look at the light to see if there are any fine substances suspended in the water. Let it stand for three hours, and then observe whether there is sediment at the bottom of the cup. If there is, it means that the suspended impurities in the water are seriously exceeding the standard; The terminal treatment must use a water purifier;
2. Smell: Take a glass of water, try to stay away from the faucet, and then smell it with your nose. Do you smell of bleach (chlorine)? If you can smell bleaching powder (chlorine), it means that the residual chlorine in tap water exceeds the standard! You must also use a water purifier for terminal processing;
3. Taste: Do you smell of bleaching powder (chlorine) when drinking boiled water? If you can smell bleaching powder (chlorine), it means that the residual chlorine in tap water exceeds the standard! You must also use a water purifier for terminal processing;
4. Observation: Make tea with tap water and observe whether the tea leaves turn black after overnight. If the tea leaves turn black, it means that the iron and manganese in tap water are seriously exceeding the standard, so a water purifier with iron and manganese filter elements should be selected for terminal treatment;
5. Product: Does the boiled water taste astringent? If it is, it means that the hardness of water is too high, so choose a water purifier with ion exchange resin softening filter element for treatment, and the treated nozzle will feel sweeter;
6. Inspection: Check whether there is a layer of yellow scale on the inner wall of the water heater and kettle at home. If there is, it also means that the hardness of the water is too high (the content of calcium and magnesium salts is too high), and the softening water purifier should be used as soon as possible for softening treatment! Attention: water with too high hardness is easy to cause scaling of water heater pipes and tube explosion due to poor heat exchange; Drinking water with too high hardness for a long time is easy to cause all kinds of lithiasis.
General water quality problems can be detected through the above steps. Of course, when you are sure that the water quality of your home really needs to be equipped with water treatment equipment to ensure healthy water use, you must ask professional water quality verification technicians to verify it.
Many water quality problems can be found through simple home visits by professional water quality verification technicians. After strict training, these technicians can check the pollution degree of water quality and propose solutions with the help of instruments, reagents or test papers they carry with them.
The most common household water quality testing items are hardness (GPG), iron content (PPM), acidity (PH), chlorine content, nitrate content and total dissolved matter (PPM).
How to use water quality testing tools;
I. TDS test pen
The abbreviation of total dissolved solids means the total content of solids dissolved in water in Chinese. TDS can immediately see the PPM value of inorganic or solid substances in the water of the design instrument.
How to use the TDS pen: Open the probe cover of the TDS pen, press the ON/OFF button with the lower mark, insert the TDS pen into the water to be measured after the LCD screen displays, and press the HOLD button with the lower mark to take out the TDS pen to read the value after the value is stable. After the test, wipe the probe of TDS pen with dry paper.
Detect the total amount of dissolved solids in water, that is, check the total amount of various organic or inorganic substances dissolved in water. The unit of use is ppm (parts per million or Mg/L), indicating the number of milligrams of total dissolved solids dissolved in 1 liter of water. Conductivity meter can measure the content of dissolved impurities in water. The more substances dissolved in water, the greater the TDS value, the better the conductivity of water, and the greater its conductivity. Conversely, the conductivity value is small.
Note: 1. When measuring, the water temperature should be kept at about 25 degrees Celsius. Remember, too high a temperature will increase the TDS value and affect the accuracy.
2.TDS can only detect conductive substances in water, but not bacteria, viruses and other substances.
Second, the electrolytic cell
The accelerated test method of solid precipitation is a simple and basic method to judge the quality of polluted water, which is recognized by the US Food and Drug Administration (F.D.A). It has important practical significance when it is necessary to test the purity of water source, so that users can clearly and intuitively see the actual situation of their daily drinking water.
Inspection methods and procedures:
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Question 2: How to test whether the water quality in the home is qualified? First, observe whether there is suspended matter in the water.
Use transparent containers and disposable plastic cups. Fill a glass of water, leave it for a few hours and observe it carefully in a well-lit place to see if there is suspended matter in the water. If the suspended matter can be seen by naked eyes, it means that the water quality is poor.
Second, check whether there is scale.
This is also easy to judge. If you have a thermos bottle at home, you can pour out the hot water and see if there is scale on the bottle wall. Basically every family will have it. By judging the speed of its generation, the faster it is generated, the more it is generated, indicating that our water quality is harder.
Third, check whether the bleaching powder exceeds the standard.
Take a glass of tap water and smell it. If there is a strong smell of bleaching powder, it means that the content of bleaching powder in water exceeds the standard. Bleaching powder itself is not very harmful, but it reacts with organic matter in water to produce chloroform, which will cause cancer. Sometimes it doesn't mean it doesn't taste. It is suggested that when the tap water at home is boiled, open the lid and burn for about three minutes.
Fourth, check whether heavy metals exceed the standard.
Friends who love tea can try it. Put a cup of strong tea overnight to see if the tea will turn black. If it will, it means that the heavy metal content in the water exceeds the standard.
Fifth, use a water quality detector for testing.
At present, the most convenient and efficient method is to use a water quality monitor, which can be installed on the faucet. If the PP cotton (white) on it turns yellow soon, it means that the impurity content in the water is high and water purification products need to be used.
At present, the water quality in cities is generally poor. Try to install a water purifier, not to save that money. After all, family health is the most important thing. There was a problem with the water quality in my house before, and then I installed a pre-filter and a terminal direct drinking machine, from Enmet, Germany. Now the water quality is much better than before, clean and hygienic, and you can safely drink it.
Question 3: How to self-test the water quality? Do you know how the water quality in your home is? For users who are going to use water purification equipment, only by clearly knowing what the water quality of their home is, can they choose the water purifier that is most suitable for their home. What the salesman said was just a cloud. I have the simplest and most effective water quality self-test method, so that you can quickly understand your own water quality problems.
Question 4: What items do water quality testing generally do? Hello!
Suggested test items are as follows:
HCT rainbow detection, pour love to answer for you!
Question 5: How to test the water quality? What water can I eat? Water quality has a pH value.
Element content
Microbial content
A series of tests
this is very troublesome
Mountain spring water is sweet.
Question 6: How to detect the water quality of fish tanks In the process of raising aquarium pets, there is a very important job that breeders need to pay attention to. That is, it is necessary to monitor whether the water quality of fish tanks is stable and healthy in time. Of course, an experienced aquarium lover may know by looking at his eyes, smelling his nose and touching his hands. Then, many parents will use professional instruments to detect the water quality of fish tanks more accurately.
At present, all the larger aquarium shops sell aquarium. Except for pH test paper, most of them are supplied in the form of liquid reagents. For friends who keep aquarium, regular water quality testing is necessary. Of course, the PH value is only a reference. It is really important to keep the water quality stable, and the index contents of nitrite and ammonia nitrogen should be well known.
Of course, if conditions permit, you can buy some professional water quality monitoring instruments. This needs to be bought in a large regular aquarium, and it is best to invite a professional friend to accompany it when buying, so as to ensure that you can buy a container suitable for testing water quality. However, if you don't want to use instruments to monitor the water quality of fish tanks, then reagents are the most accurate "monitoring objects". This purchase is very convenient, and it is usually sold in aquarium stores.
Question 7: How to test your own water quality? First, observe whether there is suspended matter in the water.
Use transparent containers and disposable plastic cups. Fill a glass of water, leave it for a few hours and observe it carefully in a well-lit place to see if there is suspended matter in the water. If the suspended matter can be seen by naked eyes, it means that the water quality is poor.
Second, check whether there is scale.
This is also easy to judge. If you have a thermos bottle at home, you can pour out the hot water and see if there is scale on the bottle wall. Basically every family will have it. By judging the speed of its generation, the faster it is generated, the more it is generated, indicating that our water quality is harder.
Third, check whether the bleaching powder exceeds the standard.
Take a glass of tap water and smell it. If there is a strong smell of bleaching powder, it means that the content of bleaching powder in water exceeds the standard. Bleaching powder itself is not very harmful, but it reacts with organic matter in water to produce chloroform, which will cause cancer. Sometimes it doesn't mean it doesn't taste. It is suggested that when the tap water at home is boiled, open the lid and burn for about three minutes.
Fourth, check whether heavy metals exceed the standard.
Friends who love tea can try it. Put a cup of strong tea overnight to see if the tea will turn black. If it will, it means that the heavy metal content in the water exceeds the standard.
Fifth, use a water quality detector for testing.
At present, the most convenient and efficient method is to use a water quality monitor, which can be installed on the faucet. If the PP cotton (white) on it turns yellow soon, it means that the impurity content in the water is high and water purification products need to be used.
At present, the water quality in cities is generally poor. Try to install a water purifier, not to save that money. After all, family health is the most important thing. There was a problem with the water quality in my house before, and then I installed a pre-filter and a terminal direct drinking machine, from Enmet, Germany. Now the water quality is much better than before, clean and hygienic, and you can safely drink it.
Question 8: How to detect the water quality of rivers (urgent) I searched Baidu and found the instrument in the following content. I wish you an early completion.
Activity flow:
(1) Introduction: Explain the objectives and tasks of this practical activity, and lead to the activity of measuring water quality. (2) Teachers teach the essentials of water sample collection, demonstrate the methods of water sample collection, and students learn to collect water samples on the spot. Make a simple water sampler. Prepare a 1 l waste coke bottle, cut off the upper part 20cm away from the bottle mouth, and tie ropes on both sides of the opening. Put the simple water extractor into the water, let the water pass through the bottle mouth, and take it out after it is filled with water samples. If possible, it is best to take a boat and collect water samples in the center of the lake.
(3) Teachers divide students into three groups, and lead them to carry out different water quality tests.
The first group: detecting the pH value of water: cut the pH test paper into pieces of paper (approximately square) with the size of 0.5×0.5cm, dip the water sample with a glass rod and drop it on the pieces of paper, and read the pH value according to the colorimetric card.
The second group: detection of phosphate in water: using rapid detection kit.
(1) Take a thermometer to measure the ambient temperature and water sample temperature on the day of the activity. (2) Absorb a certain amount of collected water sample with disposable plastic dropper and add it to the scribing line of the sample test bottle. (3) Use water quality phosphate detection kit for detection. Add 1 10 drops of phosphate detection reagent to the sample detection bottle, shake it evenly for several times, add a teaspoon of No.2 phosphate detection reagent, shake it evenly, and let it stand for 1 min. Add 10 drop of No.3 reagent, let it stand for 15 minutes, and then compare the colors to get the content of phosphate in the water.
The third group: detection of dissolved oxygen in water: use the dissolved oxygen detection kit in water for detection.
Remarks: There are many indicators that can be detected in water quality, and various rapid detection kits can be purchased in chemical reagent stores. Each kit has detailed operating instructions and is suitable for students to carry out outdoor experiments.
(4) Students report and evaluate water quality.
(1) Students carefully fill in the water quality survey record form during the experiment, and observe the growth of phytoplankton on the water surface according to the phosphate detection results obtained in the experiment, so as to judge whether the water body is eutrophic or not.
(2) The dissolved oxygen value is an important basis for studying the self-purification ability of water. Under normal circumstances, high dissolved oxygen in water indicates that the water body has strong self-purification ability, or the water body pollution is not serious. Otherwise, the water pollution is serious, and the self-purification ability is weak or even lost. The dissolved oxygen of pure water is about 9mg/L at 20℃ and 100kPa. When the dissolved oxygen in water drops to 5 g/L, some fish have difficulty breathing. Students can evaluate the self-purification ability of this water area according to the dissolved oxygen results obtained in the experiment.
(5) Students introduce the water quality test results to the public.
Students will release the water quality data to the public, publicize the knowledge about water resources protection, and let everyone know the water quality of the rivers around them, so as to improve the public's awareness of water conservation and love the water.
Question 9: What are the methods of water quality testing? H-BD5 universal water quality tester is an expert analysis system of intelligent system with built-in single chip microcomputer. The system design has the most advanced hardware and professional analysis software system. All data can be saved when power is cut off. Each instrument provides the most professional analysis/testing technology and the most professional curing method. Have the ability of field bus support and RS232/485 communication interface. Other advanced instrument accessories of Big Dipper can be selected, such as instrument modem. You can get technical support from Big Dipper engineers through telephone dialing or the Internet. You can refresh the program. BD5 tester enables most instruments to provide full range test, which saves the trouble of range selection.
The hand-held sensor of Big Dipper is ingenious in design, which can be used as a general instrument, can be directly used for grinding bottles, and can also be connected to the pipeline through pipe threads for temporary continuous detection.
H-BD5 universal analyzer can be used for any electrochemical electrode sensor (other products can also be used) or other sensors of the Big Dipper. The system is equipped with multiple calibration tables. A total of * * * set 45 channels (to be added in the future). It has 100 data storage functions. The main channel can be set to record the storage mode of the reaction process. When using multiple single probes, there is no need to worry about the data loss of the calibration table. Just change the probe and enter the calibration number with the keyboard.
Portable intelligent water quality analyzer, environmental pollution water quality analysis and measurement instrument, portable water quality analysis equipment, water quality detection instrument, water quality analyzer, portable water quality tester, intelligent water quality monitor, salinity meter,
H-BD6-WQA Multifunctional Water Quality Analyzer
H-BD6-WQA48 18 Portable Multifunctional Photometer Water Quality Emergency Detector [Introduction] [Selection Data] [Application]
Without reagents and treatment, it can directly test the total amount of chemical pollutants TDC/COD tester /COD rapid tester, biological content /BOD, total organic matter/oil TDO/ oil infrared oil analyzer, suspended matter or turbidity SS/Turb, pollution index/chroma WAI/Color, and water quality comprehensive toxicity analyzer.
Provides three bands of commonly used colorimeters. Almost all common pollutants can be analyzed by combining standard methods of water quality analysis with necessary reagents.
Question 10: There are two ways to check the water quality of the water purifier. One is an electrolyzer and the other is a tds pen. Generally, the electrolyzer is used to test the water purifier, that is, the deionized water filtered by RO is used to test the water purification effect of the water purifier. Water purifiers that can't remove ions, such as general three-stage water purifiers and ultrafilters, have no significance in measuring the water, because it doesn't remove metal ions, although it can also remove other impurities, but electrolyzed water is still the same as tap water. But this does not mean that they have no water purification effect.
Principle of water quality detection by electrolyzer;
Impurities (usually metal ions) in water can conduct electricity, and the iron rod (positive electrode) and aluminum rod (negative electrode) of electrolytic rod can make metal ions in water conduct electricity, and the dissolved substances in water can be reduced through the adsorption of opposite electricity. Testing water quality, this method is recognized by FDA as the simplest and most effective water quality testing method.
Test method of electrolytic cell:
1. Prepare two glasses (conductive containers are not allowed);
2. The amount of water to be measured (such as a glass of clean water and a glass of ordinary tap water) should be appropriate (about eight points full);
3. Put one end (iron-aluminum rod) of the electrolytic cell into another cup, and the other end (iron-aluminum rod) into another glass of water;
4, plug in the power plug, electrolyte for about 30 seconds to 65438 0 minutes, can cut off the power supply when the color changes;
5. Take out the electrolytic cell, dry the iron bar and aluminum bar and store them for later use.
Matters needing attention in electrolyzer:
1. Never use a conductive metal container to hold water for testing.
2. The output voltage of the electrode is 220 ~ 250V, so don't touch the metal bar and the water container when it is electrified.
3. After the test, be sure to turn off the switch and unplug the power supply. Take the electrolyzer again to prevent electric shock.
4, electrolysis time should not be too long (30 seconds), time is too long. Water is more conductive, which will cause short circuit, burn out the electrolyzer or trip, remember!
The full name of TDS (total dissolved solids) value is: total dissolved solids content.
The measurement principle of TDS value is actually to indirectly reflect TDS value by measuring the conductivity of water.
Physically speaking, the more substances dissolved in water, the greater the TDS value of water, the better the conductivity of water, and the greater its conductivity value.
The water purifier will remove the sediment, rust, suspended matter, colloid, bacteria and virus from the original tap water, which are insoluble in water, so the existence of these substances in water will not affect the TDS value of water.
However, some substances in the form of ions in the water will not be removed, so the water should be filtered by a water purifier.
The TDS value is similar to that of tap water. It is not that the filtering effect of the water purifier is problematic or ineffective, but it is essentially different from tap water.
Pure water will remove all substances in the water, including all ions that can't be filtered by the water purifier, so the TDS value will be quite small when testing.
However, the water filtered by the water purifier has water alkali after heating, that is, the crystals of ions existing in the water are precipitated after heating, while the water filtered by the pure water machine will not have water alkali after heating, because all the substances in the water have been filtered out, and no ionic crystals will be precipitated. Reprinted from Kaiquan Taotao Gang, please indicate the source, and offenders will be prosecuted.