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New Year's dedication, 643 WeChat tweets, a real tool!

Summary of occupational disease prevention and control work in the previous year (2016), with remarkable achievements

Two types of parallel indicators reflect the quality of occupational disease prevention and control work

Determination of toxic substances in the air in the workplace, basic requirements

There is also a conflict between these two laws and regulations for the detection and evaluation of occupational hazards

The embarrassment of occupational hazard testing

Convention on the Prevention of Hazards from Benzene and Carcinogens, from the International Labour Organization

Knowledge Points Occupational Hazards of Toluene (Serial)

Knowledge Points Occupational Hazards of Xylene (Serial)

Beware of n-hexane poisoning on the surface of mobile phones!

Organic solvent mixture

The organic solvent content in the mixture accounts for more than 5% of the mass of the mixture, which can be divided into the following three categories:

• Mixture of the first type of organic solvent: refers to the content of the first type of organic solvent in the mixture accounting for more than 5% of the mass of the mixture;
• Second organic solvent mixture: refers to the mixture containing the second type of organic solvent or the sum of the first type of organic solvent and the second type of organic solvent accounting for more than 5% of the mass of the mixture and does not belong to the first type of organic solvent mixture;
• Third organic solvent mixture: refers to an organic solvent mixture other than the first organic solvent mixture and the second organic solvent mixture.

Organic solvents are classified by chemical structure

• Straight or branched hydrocarbons : hexane, pentane, heptane
• Cyclic hydrocarbons : cyclohexane, turpentine, cyclopropene, cyclohexene
• esters : ethyl acetate, isopropyl acetate, butyl acetate
• Aromatic hydrocarbons : benzene, toluene, xylene, styrene
• alcohols : methanol, ethanol, isopropanol, n-butanol
• Ketones : acetone, methyl ethyl ketone
• Halogenated hydrocarbons : carbon tetrachloride, trichloromethane, 1,2-dichloroethane, 1,1,1-trichloroethane, 1,2-dichloroethane, trichloroethylene, tetrachloroethylene, 1,1,2,2-tetrachloroethane
• aldehyde : formaldehyde, acetaldehyde
• Ether : ether, isopropyl ether, petroleum ether
• Diol : ethylene glycol, hexanediol
• Hydrocarbons containing nitro groups : nitromethane, nitroethane
• Others : Carbon disulfide, pyrimidine, amino compounds, gasoline, kerosene, naphtha, mineral oil concentrate, mixed hydrocarbons

Common organic solvents are classified by toxicity

First class organic solvents

• Trichloromethane.
• 1,1,2,2-tetrachloroethane (1,1,2,2-tetrachloroethane).
• Carbon tetrachloromethane.
• 1,2-dichloroethylene.
• 1,2-dichloroethane (1,2-dichloroethane).
• Carbon disulfide.
• Trichloroethylene.
• Benzene.

A mixture of the above solvents.

Second type of organic solvent

• Acetone.
• Isoamyl alcohol.
• Isobutyl alcohol.
• Isopropyl alcohol.
• Ethyl ether.
• Ethylene glycol monoethyl ether.
• Ethylene glycol monoethyl ether acetate.
• Ethylene glycol monobutyl ether.
• Ethylene glycol monomethyl ether.
• O-dichlorobenzene.
• Xylene.
• Cresol.
• Chlorobenzene.
• Amyl acetate.
• Isoamyl acetate.
• Isobutyl acetate.
• Isopropyl acetate.
• Ethyl acetate.
• Propyl acetate.
• Butyl acetate.
• Methyl acetate.
• Styrene.
• 1,4-dioxane (1,4-dioxan).
• tetrachloroethylene.
• Cyclohexanol.
• Cyclohexanone.
• 1-butanol (1-butyl alcohol).
• 2-T alcohol (2-butyl alcohol).
• Toluene.
• Dichloromethane.
• Methanol (methyl alcohol).
• Methyl isobutyl ketone.
• methyl cyclohexanol.
• methyl cyclohexanone.
• Methyl butyl ketone.
• 1,1,1-trichloroethane (1,1,1-trichloroethane).
• 1,1,2-trichloroethane (1,1,2-trichloroethane).
• Butyl ketone (methyl ethyl ketone).
• N, N-dimethyl formamide.
• Tetrahydrofuran.

A mixture of the above solvents.

The third type of organic solvent

• Gasoline.
• Petroleum ether.
• Petroleum naphtha.
• Light petroleum benzine.
• Turpentine.
• Mineral spirit.

A mixture of the above solvents.