The live broadcast life of Lao Linzi in Northeast China

Chapter 570 Learn mathematics, physics and chemistry well, and you will not be afraid to go anywhere (for subscription)
Li Yuan nodded.

"Well, willow mushrooms actually have very different shapes, and some of them can be eaten, while others can't."

"But don't worry, the willow mushrooms I found today are all edible. But for safety's sake, if you find this willow mushroom, you still need to use a method to identify it."

Studio.

"What method?"

"Can you test whether it is poisonous or not?"

"How do you experiment with this thing? Could it be...using silver needles?"

"Haha, did you watch too much TV upstairs?"

"That's right, the silver needle test...you're so good!"

"But, didn't those doctors in ancient times use silver needles to test poison?"

Li Yuan couldn't help laughing when he heard this statement.

It seems... Now everyone is really addicted to the bloody plots of some TV dramas. Whether there is poison or not, you can find out with a silver needle.

If it's so easy to see, wouldn't the person who poisoned it not think of it?

Or does everyone think that people who poison people are bad people, so bad people should be fools?

Li Yuan: "Friends, the silver needle test... don't you think it's a bit ridiculous? Silver is just a metal, how can it be so powerful?"

Studio.

"But that show on TV..."

"Don't you guys know how much of the plot on TV is fake?"

"Isn't it? There are indeed examples of silver needle drug testing recorded in many books."

"Indeed, silver needle drug testing has also been mentioned in Chinese medicine."

Li Yuan shook his head.

"There are indeed such examples, but the so-called silver needle drug test does not test for poison, but for arsenic."

"Actually, the poison the ancients referred to mainly refers to the highly toxic arsenic, which is arsenic trioxide in chemistry."

"The production technology in ancient times was backward, so the purification of arsenic was relatively rough, so for the most common poison, that is, arsenic, there will be a small amount of sulfur and sulfide in it."

Studio.

"Wait a minute, so... the so-called silver needle drug test, the test is arsenic?"

"Silver needles react with sulfur, Ag2S? So, the so-called blackening is just a simple chemical reaction?"

"Isn't that as long as there is no sulfur in it, it won't turn black?"

"Damn it, it turns out that's the truth!"

"Great gods upstairs, what are you talking about?"

"Um...can you say something that we humans can understand?"

"What are they talking about, can someone explain it to me?"

After entering Li Yuan's explanation just now, many netizens who have a basic chemistry background in the live broadcast instantly realized the mystery of this.But naturally there are also many people who are not proficient in chemistry, so they didn't understand what they said at all.

Li Yuan explained in a simple way: "To put it simply, although silver can test for poison, it can only detect one kind of poison, which is arsenic."

"The reason why arsenic can be detected is because arsenic contains sulfur. After a chemical reaction between the two, it will produce silver sulfide, which can turn silver black."

"In other words, the so-called blackening is just a chemical reaction between silver ions and sulfur ions. If you test a silver needle with egg yolk, which is not poisonous but contains a lot of sulfur, the silver needle will also turn black."

"On the contrary, some substances that are very poisonous but do not contain sulfur, such as poisonous mushrooms, nitrite, pesticides, rat poison, cyanide, etc., even if the silver needles come into contact with them, there will be no black reaction."

"Besides, if you switch to the current silver needle and test it with arsenic, it may not be possible to test it again, because the current arsenic has been refined through sophisticated technology, and all the sulfides have been removed, which is quite pure."

"So silver needles can't identify poison at all, let alone be used as a drug testing tool."

"However...although silver cannot test for poison, it can sterilize."

"And as long as there are 5000 million mg of silver ions per liter of water, most bacteria in the water can be killed."

"As for this distance, it is actually related to chemistry."

"Silver forms positively charged ions in water, absorbs bacteria in the water, and gradually enters the bacteria, closing and inactivating its catalyst-enzyme system, causing the bacteria to lose their metabolic ability and die. This is the principle of silver disinfection."

"So, although silverware cannot be tested for drugs, there are still great benefits to using some silverware as bowls and chopsticks in daily life."

Studio.

"So that's the truth!"

"Sure enough, if you learn physics and chemistry well, you won't be afraid to travel all over the world!"

"It turned out to be because of chemistry..."

"Absolutely, I think the world view of the past 30 years has been subverted."

"Liar, TV shows are all liars!"

"It's not a lie, after all... the ancient poisons seem to have nothing but arsenic."

"Haha, there's nothing wrong with that."

"It's so funny... Didn't you notice it, it seems that the anchor is in the process of dispelling rumors online every day..."

"Hey, it really is!"

"An unremarkable little expert in dispelling rumors."

"Then what is the method of drug testing that the anchor just said?"

Li Yuan: "Actually, the method I'm talking about is very simple. It doesn't involve any chemistry or physics at all. Just put some white rice in the pot when cooking willow mushrooms."

"If we see white rice turning black, it means there is toxin in the willow mushroom. If the white rice doesn't turn black, it is non-toxic and edible."

"There is another way, that is, when we pick this fresh willow mushroom, we can lightly rub the green onion on the mushroom cap. If the onion turns greenish brown, then this willow mushroom is poisonous and cannot be eaten. If there is no Discoloration is non-toxic."

Studio.

"What's the point of this?"

"Yeah, why?"

"Anchor, your verification method... sounds a bit random!"

"It's a bit too casual indeed."

"I've also heard of the first method. We all do it here, but as for why... I really don't know."

Li Yuan smiled and said, "Actually, if I were asked to say this, I wouldn't be able to explain why, but the verification method handed down by people who have walked mountains for so many years, although it sounds a bit nonsensical, but it has never made a mistake."

Some things can be verified, and some things, I really can't tell why.

"I remember that there is a pine forest in front of it. It rained a lot just a few days ago. It should be the time when the broom mushrooms grow. Let's go to the pine forest in front and look for them to see if we can come across broom mushrooms."

After Li Yuan finished speaking, he changed direction and headed towards the pine forest.

"I see that many people are interested in this broom mushroom. In fact, this broom mushroom is not so mysterious. It is just a kind of strange mushroom."

"But this broom mushroom can only be found in pine forests, and it won't grow on other trees at all."

(End of this chapter)