1. What is halogen

Halogen elements include fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At). Among them, astatine is a radioactive element, and the halogens that people usually refer to are four elements: fluorine, chlorine, bromine and iodine. The first four elements are present as organic compounds in products, especially in polymeric materials.

2. Industrial application of halogen

It is well known that most organohalogen compounds are synthetic products, and there are more than 15,000 kinds of halogenated hydrocarbons. Because of their excellent performance, such as flame retardant, easy solubility and high reactivity, they are widely used in flame retardants, fluxes, refrigerants, solvents, organic chemical raw materials, pesticides and insecticides, bleaching agents, wool Degreasing agent, etc.

Flame retardants in products: PBB, PBDE, TBBP-A, PCB, hexabromododecane, tribromophenol, short-chain chlorinated paraffin;

Used as refrigerant and thermal insulation material: CFCs, HCFCs, HFCs, PFOS;

Organic chemical raw materials: pesticides, pesticides, bleaching agents, wool degreasers…

Halogen-containing plastics, especially chlorine- and bromine-containing plastics, are widely used in the electrical and electronic industries.

3. The hazards of halogen

• 1. Organohalogen compounds are toxic in themselves, and can cause cancer in humans;

• 2. The biodegradation rate of halogen compounds is very low, resulting in accumulation in the ecosystem, and some volatile organic halogen compounds have a great destructive effect on the ozone layer, which has a serious impact on the environment and human health;

• 3. When the halogen-containing plastic is exposed to high temperature, it will release hydrogen halide (HCl, HBr, etc.), and it will form acid mist when it encounters water vapor in the air;

• 4. When halogen-containing plastics are not completely burned, dioxins will be produced, which are highly accumulated and highly persistent carcinogens;

• 5. When halogen-containing plastics are burned, a large amount of smoke and toxic corrosive gases will be generated, which will hinder fire fighting and personnel evacuation, and corrode instruments and equipment.

4. Halogen control requirements

In recent years, international green environmental protection directives led by the European Union and numerous regulations and conventions have restricted the production and use of halides. At present, the industry's control requirements for halogens are only for chlorine and its compounds, bromine and its compounds, except for special customer requirements. For many halogens from different sources, most agencies use the IEC 61249-2-21:2003 standard developed by the International Electrotechnical Commission (IEC).

5. Detection method of halogen

With the implementation of the EU RoHS2.0 standard, the detection of halogens in plastic products has also received more and more attention. At present, the pretreatment methods for halogen determination include solvent extraction method, microwave-assisted extraction method, alkali fusion method, XRF analyzer, etc. Among them, XRF analyzer has the advantages of no sample preparation, accurate data, simple operation, fast detection speed, etc., and has been widely used. Applications.

Designed for RoHS/ELV compliance and halogen-free analysis, the LANScientific Consumer Goods Analyzer uses superior detection technology and innovative x-ray optical design, equipped with an intelligent software system to quickly and reliably determine whether a sample contains hazardous substances. It is an ideal choice for enterprise incoming material inspection, safety audit of finished products and other links.