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  • 1
    Electronic Resource
    Electronic Resource
    Excretion of polychlorinated dibenzo-p-dioxins and -furans in milk of cows fed on dioxins in the dry period (1992)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 40 (1992), S. 1772-1776 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00022a009
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Certification of an animal feed reference material for the organochlorine pesticide contents: BCR CRM 115 (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 1035-1041 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  An animal feed reference material has been prepared and enriched with 15 organochlorine pesticides at levels close to the maximum residue limits set up in the European Directive 74/63/EEC. The homogeneity of the material has been assessed on the basis of the pesticide contents at a level of sample intake of 5 g. The one year stability study revealed an instability of heptachlor, o,p′-DDT, p,p′-DDT, α-HCH and γ-HCH (decrease in content) and p,p′-TDE (increase) at +37 °C; at +20 °C no instability could be demonstrated. The material has been certified in an interlaboratory certification study for: HCB (0.0194 mg/kg), β-HCH (0.023 mg/kg), γ-HCH (0.0218 mg/kg), heptachlor (0.019 mg/kg), γ-Chlordane (0.048 mg/kg), α-Endosulfan (0.046 mg/kg), Dieldrin (0.018 mg/kg), Endrin (0.046 mg/kg), o,p′-DDT (0.046 mg/kg) and p,p′-DDE (0.047 mg/kg). The α-HCH isomer, Aldrin, β-Heptachloro-epoxide, p,p′-DDT and p,p′-TDE could not be certified. The methods used for the certification are described as well as the major difficulties encountered in the study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050300
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  • 3
    Electronic Resource
    Electronic Resource
    Certification of the contents of five polychlorodibenzo-p-dioxins and six polychlorodibenzo furans in milk powder (1997)
    Springer
    Fresenius' journal of analytical chemistry 359 (1997), S. 222-229 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Preparation, homogeneity and stability studies of a natural milk powder material and subsequent certification of the mass fraction of five polychlorodi-benzo-p-dioxins (D48, D54, D66, D67, D70) and six polychlorodibenzo furans (F83, F94, F114, F118, F121, F130) are described. The material, CRM 607, is intended for use in the method validation and quality control of the complete analytical procedure for congener-specific determination of dioxins in milk powder and similar dairy products and was certified in an interlaboratory study for: 2,3,7,8-TCDD, 0.25 ng/kg; 1,2,3,7,8-PeCDD, 0.79 ng/kg; 1,2,3,4,7,8-HxCDD 0.42 ng/kg; 1,2,3,6,7,8-HxCDD, 0.98 ng/kg; 1,2,3,7,8,9-HxCDD, 0.34 ng/kg; 2,3,7,8-TCDF, 0.05 ng/kg; 1,2,3, 7,8-PeCDF, 0.054 ng/kg; 2,3,4,7,8-PeCDF, 1.81 ng/kg; 1,2,3,4,7, 8-HxCDF, 0.94 ng/kg; 1,2,3,6,7,8-HxCDF, 1.01 ng/kg and 2,3,4,6,7,8-HxCDF, 1.07 ng/kg. An indicative (non-certified) value was assigned to the mass fraction of the hepta- and octachlorinated congeners D73, D75, F131, F134, F135 and the HxCDF F124.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050564
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  • 4
    Electronic Resource
    Electronic Resource
    Improvements in the analysis of chlorobiphenyls prior to the certification of seven CBs in two fish oils (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 591-597 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper gives an account of the systematic, collaborative learning programme undertaken by a group of experienced analytical laboratories within the European Economic Community (EEC) to improve the state-of-the art in the determination of individual chlorobiphenyl congeners in different matrices in preparation for the certification exercises to produce two fish oils as certified reference materials (CRMs). The choice of individual CB congeners, the critical GC parameters necessary to optimise the chromatographic separation and quantification of the congener is given. An assessment is made of the methods of extraction, separation and clean-up of samples prior to gas chromatographic analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00472648
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Development of a multiresidue method for nitrogen-containing pesticides (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 357-364 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A great number of commonly used pesticides contain nitrogen and many of these compounds are amendable to gas chromatography with nitrogen-specific detection. Nitrogen-containing pesticides have however poorly been investigated in comparison to the halogen- or phosphorus-containing pesticides as regarded their possible combination in, preferably, a Multiresidue Method (MRM). In the study presented here, a start is made for a systematic approach to the multiresidue analysis of nitrogen-containing pesticides in foodstuffs. An inventory has been made of the target group of compounds and the gaschromatographic behaviour of approx. 20 nitrogen-containing fungicides has been studied, as well as their behaviour in some commonly used extraction and clean-up procedures. Results for the determination of 15 fungicides in cucumber analysed by a modification of MRM 7 of the dutch manual are described. In the near future the method will be extended for the application to other matrices and to approximately 40 nitrogen-containing herbicides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322348
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  • 6
    Electronic Resource
    Electronic Resource
    Development of a multi-residue/multi-matrix method for pesticide analysis in agricultural products (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 384-386 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Many pesticides can be determined in one analytical run after extraction from a variety of agricultural products with acetone, a GPC clean-up step followed by GC-MS as detection technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322353
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  • 7
    Electronic Resource
    Electronic Resource
    Intercomparison study on milk powder fortified with PCDD and PCDF (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 348 (1994), S. 37-46 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In order to find out the state of the art of dioxin analyses in cow's milk the BCR has organised an intercomparison in native and fortified milk-powders. The preparation of the milk-powder batches is described. Laboratories (n=11) have used their own in-house methods and standards. The use of a high resolution MS (R=10 000) was requested. An outline is given of how the results obtained were interpreted in discussions with the participants. A major problem in the quantification is the lack of certified standard solutions of all seventeen 2,3,7,8 congeners, this was shown during the analysis of the BCR standard solution. Recovery of the fortified dioxins from the milk-powders were in general between 80–90% of the added values. A further problem was the analysis of hepta and octa chlorinated congeners; for the calculation of international toxicological equivalent quantities (I-TEQ), larger variations in these did not significantly affect the total I-TEQ in milk-powder. Most of the participants were able to deliver satisfactory results for judging the acceptability of the milk for human consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321602
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