What is the ash content in organic matter?

Ash in food.

The plant body contains many kinds of compounds, which are all made up of different elements. What elements exist in the plant body, after the plant body is dried, it is fully burned. When burned, the carbon, hydrogen, oxygen, nitrogen and other elements in the plant body run away in the form of carbon dioxide, water, molecular nitrogen and nitrogen oxides.

The remaining non-volatile residue is called ash. Mineral elements exist in ash in the form of oxides, so mineral elements are also called ash elements.

Ash refers to the amount of solid inorganic matter in a substance. This substance can be food or non-food, inorganic with organic matter or inorganic without organic matter, and can be residue after calcination or residue after drying. But the ash must be the solid part of a substance and not the gas or liquid part.

Total ash refers to the total ash weight obtained by calcitrant oxidation of the organic matter in the sample by the minerals and inorganic salts or other impurities in the food at a certain temperature, and then the residual white substance is weighed.

The inorganic substances left after the sample is burned at high temperature are called ash. And the so-called high temperature is generally 550-600C. It can be burned in a muffle furnace (or ashing furnace).

During the burning process, the organic substances and inorganic components in the food undergo a series of physical and chemical changes, water and its volatiles are released in a gaseous manner, and the elements such as C, H, and N in the organic substances are combined with 0 to form CO2, H2O and nitrogen oxides and are lost, and the metal salts of organic acids are converted into carbonates or metal oxides, and some components are converted into oxides, phosphate sulfates or halides.

However, in fact, some volatile elements (such as etc.) will be volatilized and lost during ashing, and P, S, etc. can also be volatilized and lost in the form of oxygenated acids, so that these inorganic components are reduced; On the contrary, some metal oxides will absorb the CO produced by the decomposition of organic matter to form carbonates, which in turn will increase the inorganic components, so the residue after burning is usually called crude ash.

The ash composition is composed of oxides and salts, including metallic and non-metallic elements, as well as trace elements. According to the characteristics of food composition, ash contains more than 50 elements, including metal elements such as knaca mg、fe;Non-metallic elements such as Cl, S, P, Si; Trace elements such as MN Co

cu zn。

These components have great physiological value to the human body, accounting for 4% -5% of the body's body weight.

Ash in animal products is generally considered to be a constant constant, but the situation with plants is much more complex. Table 4-7 shows the average ash content of some food products, with most fresh foods containing no more than 5% ash, pure fats and fats generally containing little or no ash, smoked meat products containing 6% ash and dried beef containing more ash (on a wet basis).

Ash refers to the residue obtained by the escape of organic components by means of high-temperature burning and other means in order to pre-concentrate trace substances in analytical chemistry or qualitative analysis of biological materials. This mineralisation process is called ashing.

Ash generally refers to ash.

Ash refers to a series of physical and chemical changes of a substance at high temperatures, or the inorganic substances that remain after the volatilization and escape of organic components. The ash must be the solid part of a substance and not the gas or liquid part.

When it is burned at high temperatures, a series of physical and chemical changes occur in the food, and finally the organic components volatilize and escape, while the inorganic components (mainly inorganic salts and oxides) remain, and these residues are called ash. It is an indicator of the total amount of inorganic ingredients in a food.

The higher the ash content of the coal, the more heat it will take away when it is emitted in large quantities. Therefore, the higher the ash content of coal, the better it rolls in the process of combustion and gasification, and the easier it is to slag and affect the normal operation of large lead. The ash content of coking coal has a greater impact on the quality of coke.

Inorganics, which can be calcined residues or dried residues. But the ash must be the solid part of a substance, not the gas or liquid part.

What does total ash mean?

It is the weight of the ash that is left after burning something at high temperatures as a percentage of the weight of the substance put in before combustion.

What does ash mean in coal.

The ash content of coal refers to the yield of residues after complete combustion of coal. The ash content in coal generally indicates the amount of minerals in the coal. The ash content of coal is divided into intrinsic ash and extrinsic ash.

The intrinsic ash refers to the mineral impurities mixed into the coal in the process of coal formation, and the external ash refers to the mineral impurities mixed into the coal in the process of mining, transportation and storage, that is, gangue, which can be removed by washing method.

The ash content of coal is an important indicator to measure the quality of coal, which not only affects the heat of coal, but also affects its processing and utilization. In the process of coal preparation, it is necessary to remove foreign mineral impurities as much as possible and reduce ash content.

Ash, volatile. What does it mean respectively.

Academic knowledge, queries are a bunch of queries, and you can have a headache when you look at it.

In layman's terms, ash is the percentage of solid residue (which can be understood as coal ash) after coal combustion to the (whole) before combustion.

Volatile matter is a percentage of the volatile matter in coal that decomposes organic matter when it is burned. o up.

What we usually mean by ash is that the total ash (i.e. crude ash) contains the following three types of ash: x0d 1The amount of soluble ash and salts of potassium, sodium, calcium, magnesium, etc., which can be soluble in the form of soluble ash x0d 2

Water insoluble ash polluted sediment and oxides such as iron and aluminum and alkaline earth metals of basic phosphate 3Acid-insoluble ash contaminated sediment and trace amounts of silica and other substances that are originally present in food.