LED toxic and hazardous substance detection
basic introduction
Today in the 21st century, LED, as the greenest and most energy-saving light source, is replacing traditional light sources and becoming the protagonist of lighting appliances. In addition to energy-saving considerations, environmental protection requirements are also one of the key points in this century. Do LED lights use environmentally friendly materials? Are the materials harmful to people and the environment? This is another major issue we face.
Restrictions on Hazardous Substances
a. EU RoHS Directive
EU: Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the Restriction of the use of Certain Hazardous Substances in Electrical and Electronic equipment, i.e. EURoHS directive
b. California RoHS regulations
US California: Restrictions on the use of Certain HazardousSubstances in Electronic Devices, i.e. California RoHS, Health and Safety Code section 25214.9-25214.10.2
c. US Federal RoHS Act
US: Environmental Design of Electrical Equipment (EDEE) Act, i.e. USRoHS H.R.2420

The above bill regulates the content of the following six restricted substances in various homogeneous materials used in LED lamps:
Lead: 1000ppm, Cadmium: 100ppm, Mercury: 1000ppm, Hexavalent chromium: 1000ppm, Polybrominated biphenyls: 1000ppm, Polybrominated diphenyl : 1000ppm
EU RoHS recommends giving priority to four substances
a. Three Phthalates (BBP, DBP and DEHP)
b. Hexabromocyclododecane HBCDD
EU Chemical Registration, Evaluation, Authorization and Restricted Use Regulations
EU Regulation (EC) No 1907/2006 of theEuropean Parliament and of the Council of 18 December 2006 concerning theRegistration,Evaluation,Authorization and Restriction of Chemicals (REACH)
a. List of candidate substances for authorization
144 Substances of Very High Concern 144 (SVHC)
b. List of the Restricted Substances, Annex XVII
Some relevant test items are listed below:
Ⅰ. No. 1. Polychlorinated terphenyls (PCTs)
Ⅱ. No. 20. Organotin compounds
Ⅲ. No. 23. Cadmium
Ⅳ. No. 42. Short-chain chlorinated paraffins
Ⅴ. No. 46. Nonylphenol and nonylphenol ethoxy
Ⅵ. No. 50. Polyaromatic hydrocarbons (PAH)
EU Persistent Organic Pollutants Regulation
EU Regulation (EC) No 850/2004 of the European Parliament and of the Council of 29 April 2004 on Persistent Organic Pollutants
Some related test items listed as below
a. Perfluorooctane sulfonic acid and its derivatives (PFOS)
b. Polychlorinated Biphenyls (PCB)

GS certified 18 kinds of polycyclic aromatic hydrocarbons 18 PAHs requested by GS certificate