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  • 151.
    Wickenberg, Per
    et al.
    Lund university.
    Axelsson, HarrietMalmö university.Fritzén, LenaVäxjö university.Helldén, GustavKristianstad University, Department of Mathematics and Science.Öhman, JohanÖrebro university.
    Learning to change our world?: Swedish research on education & sustainable development2004Collection (editor) (Refereed)
  • 152.
    Wilsson, Anneli
    Kristianstad University College, Department of Mathematics and Science.
    Förslag till placering av anläggningar för att förbättra vattenkvalitén i Tidan 2006Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Considering water quality, landuse and reducion of wetland area in the watershed of Tidan, areas witch are in need of constructions to improve the water quality are identified. Constructions are suggested to be located within the smaller streams in the watershed, so that the water is treated before it reaches the stream Tidan.

  • 153.
    Zorita, Saioa
    et al.
    Division of Analytical Chemistry, University of Lund.
    Hallgren, Pär
    Kristianstad University College, Department of Mathematics and Science.
    Mathiasson, Lennart
    Division of Analytical Chemistry, University of Lund.
    Steroid hormone determination in water using an environmentally friendly membrane based extraction technique2008In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1192, no 1, p. 1-8Article in journal (Refereed)
    Abstract [en]

    In this study, a method was developed for determination of steroid hormones (17beta-estradiol, estrone, 17alpha-ethynylestradiol) in tap and sewage water samples from Sweden. Sample preparation and analysis were performed by a hollow-fibre microporous membrane liquid-liquid extraction (HF-MMLLE) set-up combined with gas chromatography-mass spectrometry (GC-MS). In this approach, only the organic liquid in the lumen (10microL) of the hollow-fibre membrane was utilised for depleting extraction. Several parameters were studied, including: type of organic solvent, sample pH, salt and humic acid content. The optimised method allowed the determination of the analyte at the low ngL(-1) level in tap and sewage water. A linear plot gave correlation coefficients better than 0.995 and resulted in a method limit of detection of 1.6, 3 and 10ngL(-1) for 17beta-estradiol, estrone, and 17alpha-ethynylestradiol, respectively, in sewage water. Enrichment factors were over 1400 after derivatisation. The repeatabilities at 50 and 600ngL(-1) were better than 10% and 6%, respectively.

  • 154.
    Zorita, Saioia
    et al.
    Division of Analytical Chemistry, Lund University.
    Mårtensson, Lennart
    Kristianstad University College, Department of Mathematics and Science.
    Mathiasson, Lennart
    Division of Analytical Chemistry, Lund University.
    Hollow-fibre supported liquid membrane extraction for determination of fluoxetine and norfluoxetine concentration at ultra trace level in sewage samples2007In: Journal of Separation Science, ISSN 1615-9306, E-ISSN 1615-9314, Vol. 30, no 15, p. 2513-2521Article in journal (Refereed)
    Abstract [en]

    In this study, a method was developed for determining the concentration of the pharmaceutical fluoxetine and its metabolite, norfluoxetine, in sewage water samples. Sample preparation was performed by hollow-fibre supported liquid membrane (HF-SLM) extraction with final analysis using liquid chromatography with UV detection. Several parameters were studied including type of organic solvent, sample and acceptor pH, and salt and humic acid content. The optimised method allowed determination of the analyte at the ng/L level in sewage water. A linear plot gave a correlation coefficient better than 0.991 for both analytes and resulted in limits of detection in sewage water of 11 and 12 ng/L, for fluoxetine and norfluoxetine, respectively. The enrichment factor was over 1700 for both analytes in sewage water. The repeatability and reproducibility were better than 8% and 17%, respectively. The developed methodology was used to study daily variations of fluoxetine and norfluoxetine in municipal sewage streams. Norfluoxetine has been detected for the first time in sewage water and a preliminary analysis gave average concentrations of 150 and 225 ng/L for norfluoxetine and fluoxetine, respectively.

1234 151 - 154 of 154
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