The Cold President's Best Master

Hearing Su Zhifei's question, Shi Chenggong glanced at the value on the detector, shook his head and stared at Su Zhifei: "how can it be so high? Mr. Lu washed his hands with hand sanitizer just now! If you take off your feet and wash your feet now, it can be so high!"

As Su Zhifei's teacher, he certainly knows that Su Zhifei has a smelly foot, Xiangjiang foot.

Su Zhifei wanted to laugh at Lu Chong, but was laughed at by the teacher. Suddenly his face looked ugly.

Li Wenxiu hurriedly asked, "teacher, what is the value above?"

Shi Chenggong said with a wry smile, "I don't believe it, but the fact is that the value in this glass of water is 1!"

Su Zhifei and Li Wenxiu were stunned when they heard Shi Chenggong's words.

"Impossible! Impossible!" Su Zhifei shouted again and again. "According to the national standard, the value less than 10 is pure water. The number of many good pure water is only eight to nine. This glass of water is still the water that the guy washed his hands. There must be impurities in it. How can it be just 1!"

Li Wenxiu looked at Lu Chong in surprise. Now she is full of curiosity and interest in Lu Chong. How did he make his hand washing water cleaner than pure water? If the original clean water was tap water, its value was definitely dozens. How could it be reduced to 1 at once!

Su Zhifei was completely unwilling to believe it. He hurried to Shi Chenggong and stared at the detector. As a result, he found that it was 1!

Seeing this result, Su Zhifei remembered that he had just said that others had more than 500, and his face was a little ashamed. He quickly took the detector from Shi Chenggong's hand, and then tested the cup of hand sanitizer several times. The displayed results were 1!

He also tested in the basin of water washed by Lu, and the results were still 1!

Su Zhifei suspected that there was something wrong with the detector, so he washed his hands and tested it. It was found that the test result was 500!

He checked the tap water and found that the value was 50!

It turned out that his hands were so dirty!

In the face of this result, Su Zhifei, Li Wenxiu and Su Zhifei are all experts in the field of life sciences. They all look at each other and can't believe their eyes. The TDS value is 1. The purity of this water exceeds the scope of ordinary pure water. It's difficult to find such pure water all over the world!

However, Su Zhifei shouted, "but the lower the TDS value, the better the water quality does not mean!

TDS is the general name of inorganic and organic salts dissolved in water. Its main components include calcium, magnesium, sodium, potassium ions, carbonate ions, hydrogen carbonate ions, chloride ions, sulfate ions and nitrate ions.

TDS detector is used to detect the total amount of substances, the sum of beneficial substances and harmful substances in water, and it varies with the change of geographical location, the difference of geological conditions, ecological environment, water source environment and tap water treatment process. In some areas, TDS value is as high as more than 1000, while in some areas, it is relatively low, only more than 40. It only reflects the content of conductive substances in water In other words, if the TDS value is high, it does not necessarily mean that this kind of water is not good. For example, Evian bottled water in France is so expensive, and its TDS value is 309.

Generally speaking, the higher the TDS value, the more impurities in the water. The impurities usually refer to the concentration of various ions in the water and cannot directly indicate the quality of the water. Therefore, if the TDS is too high or more than 600, it does indicate that the water quality is not good, but the lower the TDS, it does not mean that the water quality is better.

Moreover, TDS value and water quality are two different concepts.

The quality of water quality depends on its water quality indicators. Good drinking water quality should meet the corresponding national water quality standards. TDS is only one of many water quality indicators. Qualified drinking water must meet microbial indicators, bacterial number, toxicological indicators, heavy metal ion concentration, sensory properties, color, smell, taste, visible matter to the naked eye, general chemical indicators and radioactive indicators. Healthy and clean health The living drinking water must not contain pathogenic microorganisms, the chemical substances and radioactive substances in the water must not endanger human health, and the sensory properties must be good.

In drinking water, the size of TDS can not reflect the concentration of harmful heavy metal ions in the water at all. As for the number of bacteria in the water, whether the concentration of organic matter is high or not, whether the nitrite concentration exceeds the standard, and whether there are pesticide residues, these can not be reflected by the size of TDS. Even if the concentration of bacteria and heavy metal ions in the water exceeds the standard, as long as the concentration of various charged ions dissolved in the water is high As the degree decreases, the TDS value decreases.

According to drinking water quality standard , the TDS limit of purified drinking water is 500mg / L, which also includes nearly 20 indicators such as odorless, tasteless and no visible objects. The TDS value can not accurately reflect the water quality. If the TDS detection value exceeds 1000, it certainly does not meet the standard, indicating that the tap water may be polluted. However, if it is lower than 1000, such as the detection values of 200 and 300, it can not be said that the water quality of 200 is better than that of 300, because on the one hand, the water quality of 200 is better than that of 300 Some minerals needed by human body will also be detected by TDS. On the other hand, bacteria such as Escherichia coli harmful to human body in water can not be detected by TDS. Therefore, it is inaccurate to judge water quality only by TDS value within the scope of national standards.

Moreover, it is not that the smaller the TDS value, such water is suitable for human drinking. Conductive substances are metal elements, i.e. calcium, magnesium and other elements. If these mineral elements are removed, such water is bad for people's health. What we need is that as long as we remove the substances harmful to the human body, we should also retain the mineral water beneficial to the human body, so the pure water without minerals is not suitable for the human body for long-term drinking... "

Su Zhifei said so much, just want to deny the TDS value of Lu flushing hand water is 1!

But Shi Chenggong and Li Wenxiu didn't listen to him at all. Shi Chenggong looked at Lu Chong curiously: "Mr. Lu, how did this happen? Can you explain the mystery?"

At this time, Shi Chenggong seemed not to be a world-famous academician, but like a primary school student who broke the casserole and asked to the end. His eyes were full of strong thirst for knowledge.

Li Wenxiu also looked at Lu Chong curiously, waiting for Lu Chong's answer.

Of course, Lu Chong couldn't tell them that it was caused by the aura in his body. He smiled faintly: "Academician Shi, Dr. Li, it doesn't matter why it happened. What's important is that this glass of water should be very helpful to your experiment!"

Shi Chenggong, Li Wenxiu and others were all confused when they heard Lu Chong's words. Even if the purity of this cup of hand sanitizer is very high, what does it have to do with their experiment on energy spar?

The world's top scientists failed in the experiment of energy spar. Will they stop the fate of failure because of this glass of water?