What is the RoHS?
The Restriction of the use of certain Hazardous substances in Electrical and Electronic Equipment.The SIX most famous toxic components are: Pb、Hg、Cr6+、PBB、PBDE，Cd.
{ Note: Polybrominated biphenyls (PBB) and Polybrominated diphenyl ethers (PBDE)}
The general SOPs are following.
(1) Use the the X-ray Fluorescence (photoelectric effect) to measure the elemental composition of a sample. Also FT-IR can also be used for screening, specifically for PBB and PDBE.
(2) GC-MS for the PBB&PBDE assay:
Column: POMSi 15 -30 m, 0.25 mm, .1 um.
Temp Ramp: 110 C (hold for 5 min), increase to 200 C @ 40C/min, hold for 4.5 min, then to 325 C @ 10 C/min, hold for 15 min.
Inlet Temp: 250 C.
MS: EI full scan or selecting ion scan from 200.0amu to 960.amu @ 70 KV.
( Note from EPA8270c & ISO 17025)
(3) HPLC/Uv for the PBB&PBDE assay:
Mobile Phase : 97% MeOH and 3% Buffer(0.1509 g KH2PO4 and 0.2477 g NaHPO4 in 100ml D.I H2O) @ C18 Reverse phase column.
Run time 12 min, flow rate: 1ml/min。
Solvent: n-IPA.
Wavelength: 254 nm, 210 nm.
{From M. Riess and R. van Eldik, Journal of Chromatography A，827 (1998):65-71}
(3) Colorimeter for the Cr6+ assay. See more details from EPA 3060 A, 7196A, 7199A, 218.6, ISO 3613: 2000(E).
(4) AAS or ICP-MS for the Pb、Hg、Cd assay.
See EPA 7000.
(5) Final, use ISO 5725 for data analysis.
Done... (:>) smile
