SIST EN 1948-4:2011/kFprA1:2013

SIST EN 1948-4:2011/kFprA1:2013 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Stationary source emissions - Determination of the mass concentration of PCDDs/PCDFs and dioxin-like PCBs - Part 4: Sampling and analysis of dioxin-like PCBs". This standard covers: 1) EN 1948-4 was elaborated with special carefulness and was validated by extensive validation measurements covering a wide concentration range. Nevertheless the described selection of the sampling standards (see EN 1948-4, Table 1) causes co-elution problems of PCB 127 and PCB 105 on the most common columns. The use of the columns HT-8 or Agilent XLB can avoid these co-elution problems, but they are not so common for routine analyses. The sampling standard PCB 127 was chosen in order to monitor the similar and most toxic congener PCB 126 and is of special importance for plants which mainly emit PCBs. In order to avoid the co-elution problems during routine analyses a more flexible specification is given and the following footnote to EN 1948-4, Table 1, is added: Footnote b) Sampling standards: Attention should be paid to possible co-elution problems of PCB 127 and PCB 105 on certain commercially available columns. If the co-elution problems cannot be avoided, it is allowed to omit the sampling standard PCB 127. 2) In order to avoid any misunderstanding with regard to the sampling compartments to be spiked with labelled standards a reference to EN 1948-1 should be added to the first sentence of EN 1948-4, Clause 6.2: "The sampling standards (see Table 1) shall be added to the different sampling media before sampling and the extraction standards shall be added to the samples before extraction according to EN 1948 Part 1."

1) EN 1948-4 was elaborated with special carefulness and was validated by extensive validation measurements covering a wide concentration range. Nevertheless the described selection of the sampling standards (see EN 1948-4, Table 1) causes co-elution problems of PCB 127 and PCB 105 on the most common columns. The use of the columns HT-8 or Agilent XLB can avoid these co-elution problems, but they are not so common for routine analyses. The sampling standard PCB 127 was chosen in order to monitor the similar and most toxic congener PCB 126 and is of special importance for plants which mainly emit PCBs. In order to avoid the co-elution problems during routine analyses a more flexible specification is given and the following footnote to EN 1948-4, Table 1, is added: Footnote b) Sampling standards: Attention should be paid to possible co-elution problems of PCB 127 and PCB 105 on certain commercially available columns. If the co-elution problems cannot be avoided, it is allowed to omit the sampling standard PCB 127. 2) In order to avoid any misunderstanding with regard to the sampling compartments to be spiked with labelled standards a reference to EN 1948-1 should be added to the first sentence of EN 1948-4, Clause 6.2: "The sampling standards (see Table 1) shall be added to the different sampling media before sampling and the extraction standards shall be added to the samples before extraction according to EN 1948 Part 1."

SIST EN 1948-4:2011/kFprA1:2013 is classified under the following ICS (International Classification for Standards) categories: 13.040.40 - Stationary source emissions. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 1948-4:2011/kFprA1:2013 has the following relationships with other standards: It is inter standard links to SIST EN 1948-4:2011+A1:2014, SIST EN 1948-4:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

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