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result sql = Determination of natural and synthetic estrogens and their conjugates in sewage sludge by pressurized liquid extraction and liquid chromatography-tandem mass spectrometry.
Determination of natural and synthetic estrogens and their conjugates in sewage sludge by pressurized liquid extraction and liquid chromatography-tandem mass spectrometry.
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char = g;code = 103
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char = d;code = 100
char = .;code = 46
char = w;code = 119
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char = );code = 41
char = .;code = 46
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char = h;code = 104
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char = ;code = 32
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char = p;code = 112
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char = a;code = 97
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char = o;code = 111
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char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
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char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = e;code = 101
char = s;code = 115
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char = i;code = 105
char = o;code = 111
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char = o;code = 111
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char = h;code = 104
char = i;code = 105
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char = h;code = 104
char = e;code = 101
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char = t;code = 116
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char = a;code = 97
char = l;code = 108
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = 4;code = 52
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char = g;code = 103
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char = g;code = 103
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result sql = In this study we present a pressurized liquid extraction/liquid chromatography-tandem mass spectrometry (PLE/LC-MS-MS) method to determine a group of estrogens and conjugated estrogens in sewage sludge. Parameters that affect the extraction step such as extraction solvent, temperature, pressure, static extraction time, number of cycles, purge time and flush volume have been optimized. In the LC-MS-MS system, electrospray ionization and a triple quadrupole analyzer have been used, and the multiple reaction monitoring mode has enabled low levels of target analytes to be detected. All recoveries were higher than 81% except for estrone 3-glucoronide and estradiol 17-glucoronide which were not extracted and consequently, they were not considered in the present study. The repeatability and reproducibility between days expressed as %RSD (n=3), were lower than 6% and 9%, respectively. The method developed allowed the target analytes to be quantified at low levels of microg/kg. The limits of detection were lower than 26 microg/kg of dry weight (d.w.) of sewage sludge, except for 17 alpha-estradiol, 17beta-estradiol, 17 alpha-ethinylestradiol and estradiol 17-acetate whose values were between 150 and 175 microg/kg (d.w.). The method was applied to determine these compounds in sewage sludge from two domestic sewage treatment plants. Estrone 3-sulfate, estradiol 3-sulfate, diethylstilbestrol, estrone and estriol were determined in some samples and estriol showed the highest value (406 microg/kg d.w.).

Publication: J Chromatogr A 2008 Dec 12 ;1213(2)::224-30.
Publication Date: 2008 Dec 12
Study Author(s): Nieto, Antonio;Borrull, Francesc;Pocurull, Eva;Marcé, Rosa Maria;
Institution: Department of Analytical Chemistry and Organic Chemistry, University Rovira i Virgili, Sescelades Campus, Marcel.lí Domingo s/n, Tarragona 43007, Spain.
Shortcut link to this study:
In this study we present a pressurized liquid extraction/liquid chromatography-tandem mass spectrometry (PLE/LC-MS-MS) method to determine a group of estrogens and conjugated estrogens in sewage sludge. Parameters that affect the extraction step such as extraction solvent, temperature, pressure, static extraction time, number of cycles, purge time and flush volume have been optimized. In the LC-MS-MS system, electrospray ionization and a triple quadrupole analyzer have been used, and the multiple reaction monitoring mode has enabled low levels of target analytes to be detected. All recoveries were higher than 81% except for estrone 3-glucoronide and estradiol 17-glucoronide which were not extracted and consequently, they were not considered in the present study. The repeatability and reproducibility between days expressed as %RSD (n=3), were lower than 6% and 9%, respectively. The method developed allowed the target analytes to be quantified at low levels of microg/kg. The limits of detection were lower than 26 microg/kg of dry weight (d.w.) of sewage sludge, except for 17 alpha-estradiol, 17beta-estradiol, 17 alpha-ethinylestradiol and estradiol 17-acetate whose values were between 150 and 175 microg/kg (d.w.). The method was applied to determine these compounds in sewage sludge from two domestic sewage treatment plants. Estrone 3-sulfate, estradiol 3-sulfate, diethylstilbestrol, estrone and estriol were determined in some samples and estriol showed the highest value (406 microg/kg d.w.).
PMID: 18976768

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