Polychlorinated paraffins (CPs) is a class of industrial chemicals used in various high-temperature applications, for instance as lubricants and flame retardants. CPs have been produced industrially since the 1930s. There are no secure figures for the total global production but it is believed that the total production capacity exceeds several hundred thousand tons pr. year. CPs can be classified as:
Chloroparaffins, C10-C13 (Short chain chlorinated paraffins, SCCPs
Chloroparaffins, C14-C17 (Medium chain chlorinated paraffins, MCCPs
Chloroparaffins, C18-C22 (Long chain chlorinated paraffins, LCCPs
The SCCP are classified as carcinogenic while the MCCPs are suspected PBT (persistant, bioresistant, and toxic). The SCCPs have been prohibited by the POP regulation (Regulation (EC) 850/2004) in the EU since 2012. While the SCCPs still are detected in considerable quantities in environmental samples, resent studies now show an increasing presence of the MCCPs, since these are not yet regulated.
The CPs are very complex mixtures, and each group contain numerous congeners with variable chain lengths and chlorination degree. Additionally several stereoisomers are possible for each congener. CPs from various industrially used processes, and from various suppliers give rice to different product mixes, which further complicate the analysis. Therefor the environmental analysis of CPs is both complicated and challenging.
There are currently several groups working on improving the analysis techniques, and various approaches have been applied. As of today no reliable and easy method is known. Further, there is a current lack of reliable and representative sets of reference materials.
In this EUROSTARS project, CRMs for SCCPs and MCCPs will be developed. Pure native single standards as well as 13C-labelled CPs will be synthesized as internal standards for CPs monitoring and quantification.