Is the ash left by burning newspapers heavy with lead?

The ashes left by burning newspapers are carbon.

The main component of golden paper ash is potassium carbonate, which can be used as fertilizer. The main component of potassium carbonate is very close to that of plant ash. Potassium carbonate is soluble in water, and the aqueous solution is alkaline. Insoluble substances are ethanol, acetone and ether.

Potassium carbonate has strong hygroscopicity and can absorb carbon dioxide, water and potassium bicarbonate when exposed to air, so potassium carbonate should be sealed and packaged.

Golden paper ash is widely used as fertilizer, which is suitable for planting crops, flowers, fruit trees and vegetables in greenhouse.

Detergents often used in the market also contain gold paper ash, because gold paper ash is alkaline, and detergents and toiletries containing gold paper ash have strong decontamination ability.

Gold paper ash is widely used in daily life and production. It can be said that people can't live without this kind of thing.

There are three treatment methods for extracting gold paper ash in the market: plant ash, ion exchange and electrolysis, among which ion exchange and electrolysis are widely used.

A4 paper is defined by ISO 2 16, and its specification is 21* 29.7 cm (210 mm× 297 mm). Most countries in the world use this international standard for paper size.

This standard was first incorporated into DIN (DIN 476) in 1922 by Weimar * * and China. Although some formats were developed in France at the same time, they were later forgotten. ф o 216defines three groups of paper sizes: a, b and c: Group C paper size is mainly used for envelopes.

The aspect ratio of group A paper size is √ 2: 1, and then the nearest millimeter value is rounded. A0 is defined as paper with an area of one square meter and an aspect ratio of √ 2: 1. The following paper sizes, such as A 1, A2, A3, are all defined as the paper with one digit missing is folded in half along the long side, and then rounded to the nearest millimeter.

The size of group B paper is the geometric average of the same number of sheets and one less number of sheets of group A paper. Before the popularization of printers, group B paper was mostly used. Group C paper size is mainly used for envelopes.

People's Republic of China (PRC) national standard GB/T 148- 1997 "Paper size for printing, writing and drawing" is not equivalent to ISO2 16: 1975.