Legal analysis: concentrated nitric acid is a prohibited chemical and is controlled by the public security department. Dilute nitric acid below 5% is not within the specified range. According to the laws related to hazardous chemicals, public security organs are responsible for the public safety management of hazardous chemicals, issuing purchase licenses and road transport permits for highly toxic chemicals, and managing road traffic safety of vehicles transporting hazardous chemicals. Sulfuric acid is the most active binary inorganic strong acid, which can react with many metals. High concentration sulfuric acid has strong water absorption, and can be used as dehydrating agent to carbonize carbohydrate-containing substances such as wood, paper, cotton and linen fabrics, biological skins and meat. When it is mixed with water, it also releases a lot of heat energy. It is corrosive and oxidizing, so it should be used with caution. It is an important industrial raw material, which can be used to make fertilizers, drugs, explosives, pigments, detergents, batteries and so on. , also widely used in petroleum purification, metal smelting, dyes and other industries. Commonly used as chemical reagent, it can be used as dehydrating agent and sulfonating agent in organic synthesis.

Legal basis: Criminal Law of People's Republic of China (PRC).

Article 38 The term of control shall be three months or more and two years or less.

Controlled sentencing can be based on the circumstances of the crime, and criminals are prohibited from engaging in specific activities, entering specific areas, places and contacting specific people during execution.

For criminals sentenced to public surveillance, community correction should be carried out according to law.

Violation of the prohibition order stipulated in the second paragraph shall be punished by the public security organ in accordance with the provisions of the People's Republic of China (PRC) Public Security Administration Punishment Law.

Article 39 A criminal sentenced to public surveillance shall observe the following provisions during the execution:

(1) Abide by laws and administrative regulations and obey supervision;

(2) Without the approval of the administrative organ, the right to freedom of speech, publication, assembly, association, procession and demonstration shall not be exercised;

(3) to report their activities according to the provisions of the executive organ;

(four) abide by the provisions of the administrative organs on the reception of visitors;

(five) to leave the city or county where he lives or to move, he shall report to the executing organ for approval.

Criminals sentenced to public surveillance should receive equal pay for equal work.

Article 40 When the execution period of a criminal sentenced to public surveillance expires, the executing organ shall immediately announce the lifting of public surveillance to himself and the people in his unit or residence.

Article 41 The term of control shall be counted from the date of execution of the judgment; If a person is detained before the execution of the judgment, one day of detention shall be reduced to two days of imprisonment.