What are the effects of pencils cores on the human body?

Lead has a greater impact on pregnant women and children. After lead enters the human body, except for part of it is excreted through feces and sweat, the rest dissolves into the blood after a few hours, hindering the synthesis of blood, resulting in anemia, headache, dizziness, fatigue, drowsiness, constipation and limb soreness. Some have a metallic taste in the mouth, and symptoms such as arteriosclerosis, peptic ulcers, and fundus hemorrhage are also associated with lead contamination. In children, lead poisoning causes developmental delay, loss of appetite, difficulty walking, constipation, and insomnia; If you are an elementary school student, it is accompanied by hyperactivity, hearing impairment, inattention, mental retardation, etc.

This is because lead enters the human body and invades the nerve tissue of the brain through the blood, making nutrients and oxygen insufficient, resulting in brain tissue damage, which may lead to lifelong disability in severe cases. In particular, children are in the stage of growth and development, and are more sensitive to lead than adults, and the lead entering the body has a strong affinity for the nervous system, so the absorption of lead is several times higher than that of adults, and the damage is particularly serious. If lead enters the body of a pregnant woman, it will pass through the placental barrier, affect the development of the fetus, and cause malformations.

Basically, it has no effect, because the pencil lead does not contain lead, and its main component is graphite, which is carbon, so it basically has no effect on people.

It's called a pencil. But pencil leads are not made of lead. It's just a mixture of graphite and clay.

Graphite is also known as carbon. There's nothing poisonous about this. So don't worry about lead poisoning.

But some aromatic pencils can be poisonous. Because it may have some chemical agents added to it. But it's usually not a big deal.

Pencil leads are generally not toxic. The pencil lead is made of graphite and clay mixed in a certain proportion, the clay has the characteristics of non-toxic, tasteless, safe and environmentally friendly, and graphite is not toxic, even if the pencil lead is eaten by mistake, it will not be poisoned.

The main component of the pencil lead is graphite, which does not contain lead, so there is no need to worry about the pencil lead being toxic.

Graphite is composed of the element carbon, it is scaly, metallic, and the structure is so stable that nothing in the human body can destroy it.

Graphite is lubricating, can be used as a lubricant, and has a high melting point, making it particularly suitable for machines that operate at high temperatures.

Pencil leads are not toxic.

Pencil leads are made of graphite and clay. Graphite is an allotrope of carbon, which is gray-black, opaque solid, chemically stable, corrosion-resistant, and not easy to react with acids, alkalis and other agents. Carbon dioxide is generated by combustion in oxygen, which can be aged by strong oxidants such as concentrated nitric acid, potassium permanganate and other oxygen chambers.

It can be used as an anti-wear agent, lubricant, and high-purity graphite is used as a neutron moderator in atomic reactors.

Graphite is a transitional crystal between atomic, metallic, and molecular crystals. In the crystal, the carbon atoms in the same layer are hybridized by sp2 to form a covalent bond, each carbon atom is associated with three other carbon atoms, and the six carbon atoms form a regular hexagonal ring in the same plane, which stretches to form a lamellar structure. The carbon atoms in the same plane each have a p orbital left, and they overlap each other to form a delocalized bond The electrons can move freely in the crystal lattice and can be excited, so graphite has a metallic luster, can conduct electricity and transfer heat.

Due to its special structure, graphite has the following special properties:

1) High temperature resistance.

The melting point of graphite is 3850 50, even if it is burned by ultra-high temperature arc, the weight loss is very small, and the coefficient of thermal expansion is also very small. The strength of graphite increases with temperature, and at 2000, the strength of graphite doubles.

2) Electrical and thermal conductivity.

The electrical conductivity of graphite is a hundred times higher than that of ordinary non-metallic minerals. Thermal conductivity exceeds that of metallic materials such as steel, iron, and lead. The thermal conductivity decreases with increasing temperature, and even at extremely high temperatures, graphite becomes an insulator.

Graphite is able to conduct electricity because each carbon atom in graphite forms only 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transport the charge.

Pencil leads are non-toxic. Although the pencil lead has a pencil lettering, in fact, the pencil of today has nothing to do with metal lead. The early pencils contained lead, and now the main ingredient of the pencil lead is graphite, and the lead of the pencil is made of a certain proportion of graphite and clay, which no longer contains metallic lead, and is not poisonous, but do not bite the pencil, which is unhygienic.

For the sake of health and safety, it is a bad habit to try not to bite the pencil. If it is a child, the child should be taught not to bite the tip of the pen, which is a bad behavior, and the child should be allowed to develop good living habits.

Pencil graphite and clay content vary by model, but there is no significant difference in overall structure. The composition of the refill is mainly graphite and some adhesives, and graphite is non-toxic. The pencil lead is not a lead-containing ingredient because the pencil lead does not contain lead, so it is non-toxic.

The question of whether pencil leads are toxic or not often bothers some people. In fact, people who have this kind of doubt often think that pencil leads contain lead, and the use of lead-containing pencils may naturally lead to lead poisoning. then Are pencil leads toxic?

1. It does not contain lead and is generally non-toxic. The main components of the lead core of the pencil are graphite and clay, and the pencil is divided into 18 types according to the national standard according to the graphite concentration. Early pencils contained lead, and now the main components of pencil refills used by people are graphite and binders, which no longer contain lead and are harmless to the human body.

However, the paint on the outside of the pencil contains lead, so students who like to contain pencils, remember not to contain pencils, this habit must be changed.

2. In the current standardized test in China, the computer can only read the pencil handwriting with a lead core concentration of 2b, and too thick or too light will cause the failure or error of computer reading. The pencil lead can be unlocked because the pencil lead contains graphite, and graphite is lubricating, and the pencil lead can lubricate the rust lock.

3. Graphite has a high melting point, and as a lubricant, it is especially suitable for machines that work at high temperatures. At high temperatures, the oil usually decomposes, however, graphite is stable and continues to play a lubricating role. Graphite is a solid with a metallic luster in the form of scales, composed of the element carbon, and the structure is very stable, and nothing in the human body can destroy it, so the pencil lead is non-toxic.

4. Since the main component of the pencil is graphite, and graphite is a conductor, the pencil lead can conduct electricity. However, the conductivity of pencil leads is not very strong. Because of the arrangement of the atomic structure of graphite, it can only conduct electricity in two dimensions, that is, it is conductive between two points in the same plane, and the upper and lower sides of the plane are not conductive.

Pencil leads are non-toxic.

The main component of pencil leads is graphite.

Because, the lead of the pencil is made with a mixture of graphite and clay in a certain proportion.

Graphite: Hazard description: non-toxic, dust inhalation can cause respiratory diseases;

Clay: Features: non-toxic and tasteless, safe and environmentally friendly, nootropic development.

And graphite and clay are non-toxic, so the pencil lead is non-toxic.