Which analytical tools/instruments/techniques are used for POPs. A general walk through the analysis
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1 Which analytical tools/instruments/techniques are used for POPs A general walk through the analysis Kay Kelterer Eurofins GfA Lab Service GmbH Großmoorbogen 25, Hamburg, Germany Miljøgifter i fisk og sjømat - Alesund, Norway 23rd April
2 POPs? The POPs started with... of the Stockholm convention in 2001 to ban or reduce the use of 12 Persistent Organic Pollutants. 2
3 POPs the initial 12 Stockholm POPs Pesticides: Aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, hexachlorobenzene, mirex, toxaphene Industrial chemicals: Hexachlorobenzene, polychlorinated biphenyls (PCBs) By-products: Hexachlorobenzene; polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/PCDF), and PCBs. 3
4 POPs? The list of POPs is still growing: 2009 nine new POPs (chlordecone, alpha hexachlorocyclohexane, beta hexachlorocyclohexane, lindane, pentachlorobenzene, hexabromobiphenyl, hexabromodiphenyl ether and heptabromodiphenyl ether, perfluorooctane sulfonic acid, its salts and perfluorooctane sulfonyl fluoride, tetrabromodiphenyl ether and pentabromodiphenyl ether) 2011 one new (Endosulan) 2013 one new(hexabomocyclododecane) 2015 There are several substances under discussion. For more details: (official homepage of the Stockholm convention) 4
5 Back to analytics You have the sample and need a result. Labs usually need samples and produces results. 5
6 Sample meets the Lab In the beginning there was the sampling Usually sampling is in the responsibility of the client. Be always aware the best analytical tool are not able to compensate for mistakes during sampling. We assume that the lab gets a representative sample. 6
7 Sample meets Lab co-worker Sample preparation: The sample needs to be prepared for the next steps. Depending on matrix different steps are necessary. 7
8 Preparation step: Homogenisation Every following step has to be done with a homogenised sample and/or a representative part of the sample (e.g. edible part of fish according to EU legislation) 8
9 Preparation step: Homogenisation Tools: Knife Cutter Grinder Mills 9
10 Preparation step: Water removal Part 1 For the extraction with solvents, water is interfering. Water needs to be removed (drying) or bonded (chemical). 10
11 Preparation step: Water removal Part 2 Tools: Freeze dryer Drying oven Chemicals: Sodium sulphate (Na 2 SO 4 ) Polyacrylic acid (PAA) 11
12 Free the POPs The POPs need to be extracted from the sample matrix. Several techniques depending on the specific POP are useful. 12
13 Extraction: Techniques Part 1 Tools: Dissolve in solvent e.g. Oils Liquid / liquid e.g. Water HCl digestion e.g. Fly Ash 13
14 Extraction: Techniques Part 2 Tools: Ultrasonic bath e.g. PFC Microwave e.g. Eggs 14
15 Extraction: Techniques Part 3 Tools: Soxhlet e.g. Feed ASE e.g. Fish 15
16 Cleaning the POPs A mixture of several substances has been extracted. To prepare the sample extract for measurement interferences have to be removed. 16
17 Column chromatography Part 1 Tools: Glass columns filled with different adsorbents. Adsorbents differ from substance to substance. 17
18 Column chromatography Part 2 Chemicals: Silica gel (pure or mixed) Aluminium oxide Florisil Carbon 18
19 Column chromatography Part 3 Tools: Automated systems 19
20 Slimming Reduction of the (partly enormous) volume of solvent. For some of the POPs the final volume has to be reduced down to 10µL. 20
21 Evaporation Tools: Rotary evaporator Turbo vap Gentle flow of Nitrogen 21
22 Unmask the POPs For visualisation different mass spectrometers are used in combination with a chromatographic system. Outcome: Signals = Peaks 22
23 Measurement Part 1 Chromatographic tools: Gas Chromatograph Liquid Chromatograph 23
24 Measurement Part 2 Measurement tools: LRMS (Low Resolution) HRMS (High Resolution) MS/MS (Triple Quad) 24
25 Give them numbers Calculation software (from instrument producer or proprietary software) 25
26 Handling of the numbers Tools: LIMS coupled with the calculation software to generate the CoA. For special requests individual reports are possible 26
27 Job done? Summary: Sample Preparation Extraction Cleanup Measurement Calculation Report 27
28 Hidden tools Part 1 Quality systems: DIN EN ISO/EIC cgmp R&D: For scientific projects and speciality analyses 28
29 Hidden tools Part 2 Lab structure: Spacial separation according to contamination levels Waste disposal; material supply Reference standards: Certified standards 29
30 Hidden tools Part 3 Most important: Experienced staff 30
31 Questions? Thanks for your kind attention Enjoy the coffee break! 31
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