What is a halogen test? Halogen test methods

Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), referred to as halogen. As astatine is a radioactive element, halogens often refer only to fluorine, chlorine, bromine and iodine. Halogens are widely used in flame retardants, refrigerants, solvents, organic chemical raw materials, pesticides, bleaches, wool degreasing, etc.

Halogen Introduction

It is well known that most organic halogen compounds are artificially synthesized products, and there are more than 15000 kinds of commercial halogenated hydrocarbons. They are widely used as flame retardants, fluxes, refrigerants, solvents, organic chemical raw materials, pesticides, bleaches, wool degreasers, etc. due to their excellent performance, such as flame retardancy, solubility and high reactivity. However, these organic halogen compounds are toxic, latent and carcinogenic in the human body, and their biodegradation rate is very low, resulting in accumulation in the ecosystem, and some volatile organic halogen compounds have a great destructive effect on the ozone layer, causing serious impact on the environment and human health.

Halogen is rarely used directly in people's daily life, and is generally used as industrial raw materials to synthesize halogenated compounds with different uses. Most of the halogens used in industry are organic halogens, and many organic halogens are listed as chemicals harmful to human beings and the environment. Their use is prohibited or limited, and they are pollutants that countries around the world focus on controlling. At present, halogen compounds used in products are mainly flame retardants, such as PBB, PBDE, TBBP-A, PCB, hexabromododecane, tribromophenol, short chain chlorinated paraffins; Ozone destroying substances used as refrigerants and heat insulation materials, such as CFCs, HCFCs, HFCs, etc., as well as fire extinguishing agents, cleaning agents, pesticides, bleaches, wool degreasers, etc.

Halogen compounds are widely used in the electronic industry, such as chlorinated paraffin can be used as plasticizer of plastic materials, and difluorodichloromethane can be used as foaming agent in ABS, PS, PVC, PU and other plastics. However, halogen compounds are most widely used as flame retardants. Common halogen flame retardants include bromine flame retardants such as PBB, PBDE, TBBP-A and HBCDD, and chlorine flame retardants such as short chain chlorinated paraffin and PCB. The use of flame retardants can achieve flame retardancy, and halogenated flame retardants have less influence on the inherent physical and mechanical properties of the flame retardant substrate. However, the use of halogenated flame retardants has disadvantages: once a fire occurs, incomplete combustion of halogenated flame retardants will produce a large number of carcinogens; In addition, materials using halogenated flame retardants will produce a large amount of smoke and toxic corrosive gases when burning, which will hinder fire fighting and personnel evacuation, and corrode instruments and equipment.

Halogen test methods

1. Halogen XRF rapid detection

2. Chemical Testing of Halogen Elements

3. Chemical Testing of Specific Halogen Organics

4. Halogen complete machine verification

5. PVC composition analysis