Kemesta

This part of ISO 787 specifies a method for determining the total contents of polychlorinated biphenyls (PCBs), checking for all 209 possible congeners in pigment materials. The use of such solid surface extraction methods risks underestimating the actual content by orders of magnitude. Such errors are often further enhanced when the PCBs quantitation is carried out by using external or internal reference materials which do not undergo the same losses as the analytes that are occluded in the crystal lattice of the pigment. Furthermore, Aroclor® or Clophen® mixes may not be used as reference materials as most PCB congeners therein are not related to pigment chemistry[5,7,8]. Lower quantitation limit: 1 mg/kg Working range: 1 mg/kg to 150 mg/kg

This document specifies performance requirements and test methods under prescribed laboratory conditions for the evaluation of pumped samplers used in conjunction with an air sampling pump and of procedures using these samplers for the determination of gases and vapours in workplace atmospheres. This document is applicable to pumped samplers and measuring procedures using these samplers in which sampling and analysis are carried out in separate stages. This document is not applicable to pumped samplers which are used for the direct determination of concentrations, for example, length-of-stain detector tubes and samplers which rely on sorption into a liquid, and subsequent analysis of the solution (bubblers).