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  • 1
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatographic determination of phenoxyalkanoic acid herbicides using iron(II) 1,10-phenanthroline as a mobile phase additive
    Amsterdam : Elsevier
    Journal of Chromatography A 481 (1989), S. 439-444 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0021-9673(01)96793-7
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  • 2
    Electronic Resource
    Electronic Resource
    Interaction behavior of organochlorine pesticides with dissolved Jordanian humic acid (1995)
    Springer
    Archives of environmental contamination and toxicology 28 (1995), S. 513-518 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The interaction behavior of Jordanian humic acid isolated from the sediment of King Talal Dam with some chlorinated pesticides (tetradifon, p,p′-DDE and p,p′-DDT) was studied under different experimental conditions, namely: humic acid concentration, pH, and temperature. The synergistic effect was also studied. The amount of pesticide that did not interact was determined by extraction and analysis by gas chromatography. The interacted amount of pesticide was directly proportional to the concentration of soluble humic acid and inversely proportional to pesticide polarity. There was no significant change in the interacted amount of pesticide with respect to change in temperature. With pH increase, there was a small decrease in the interacted amount of tetradifon, while no changes were detected for p,p′-DDE and p,p′-DDT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211635
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of trihalomethanes produced through the chlorination of water as a function of its humic acid content (1994)
    Springer
    Archives of environmental contamination and toxicology 26 (1994), S. 381-386 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Pure humic acid was isolated from Azraq Oasis sediments in the east of Jordan. Different concentrations of humic acid solutions, under different experimental conditions were analyzed for trihalomethanes (THMs), using different concentrations of hypochlorite ion as the chlorinating agent. The analysis of the THMs was done by capillary gas chromatography equipped with a 63Ni-electron capture detector. The presence of trihalomethanes in drinking water from some sites in Jordan was also studied, and some treatment techniques were attempted that could be used for reducing or eliminating trihalomethanes from drinking water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203566
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  • 4
    Electronic Resource
    Electronic Resource
    A simple, sensitive, and specific HPLC amperometric screening method for trace levels of sulphonamides in liver, kidney, and muscle tissues (1981)
    Springer
    Chromatographia 14 (1981), S. 704-706 
    Details
    ISSN: 1612-1112
    Keywords: Sulphonamides, determination ; HPLC ; Reversed phase ; Amperometric determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple, sensitive and specific method for the analysis of the residues of sulphonamides in liver, kidney, and muscle tissues is described. The method is based on a simple extraction step, separation on a RP-C2 column and amperometric detection at +1.10 V. Recoveries were calculated with the aid of sulphamerazine as internal standard. The detection limit of the proposed method is 10 ng/g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259459
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  • 5
    Electronic Resource
    Electronic Resource
    HPLC determination of the phenolic metabolites of phenoxy alkanoic acid herbicides (1989)
    Springer
    Chromatographia 28 (1989), S. 465-468 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chlorinated phenols ; 4-Aminoantipyrine derivatives of phenols ; Metabolites of phenoxy alkanoic acid herbicides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary High performance liquid chromatography (HPLC) has been applied to the separation and determination of o-chlorophenol, 2,4-dichlorophenol, 3,4-dichlorophenol, 2,5-dichlorophenol, and 2,4,5-trichlorophenol in water samples after prior derivatization with 4-aminoantipyrine. These substances are the phenolic decomposition products of the phenoxy-alkanoic acid herbicides: 2,4-dichlorophenoxyacetic acid (2,4-D), 2,4-dichlorophenoxybutyric acid (2,4-DB), and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T). An RP-C18 column was used, with gradient elution starting at 50/50 and changing to 70/30 methanol/water (v/v) after 24 min. Detection was carried out at 470 nm where the 4-aminoantipyrilquinonimine derivatives show maximum absorbance. The method was linear over a concentration range of 5–10,000 ppb phenol in the original water sample. By using an enrichment step a detection limit of 2 ppb phenol could be approached. The method was used to study the degree of degradation of the phenoxy acids to phenols under different conditions of temperature, pH, and UV irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261061
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of pyridate and its main metabolite CL-9673 in plant materials (1986)
    Springer
    Chromatographia 22 (1986), S. 40-42 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Pyridate ; CL-9673 ; Reversed phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application of a simple reversed-phase, HPLC-UV method for the determination of the contact herbicide pyridate and its main metabolite 3-phenyl-4-hydroxy-6-chloropyridazine-known as CL-9673-in green cereals, grains and straw is described. The method is based on a simple extraction, separation of pyridate from its metabolite, hydrolysis of pyridate to CL-9673, high-performance liquid chromatographic separation of CL-9673 in both fractions using only one reversed phase column and UV-detection. The method is sensitive down to 3 ngg−1 CL-9673 in green plants and grain and 5ngg−1 in straw. In the range 0.05–1.0mgkg−1 recoveries are between 73.7% and 109% from green plants, between 77.7% and 102% from grains and between 77.3% and 87.5% from straw.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257294
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of sulphonamides in milk by HPLC with electrochemical detection (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 307 (1981), S. 382-384 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Sulfonamiden, Sulfadiazin, Sulfadimidin in Milch ; Chromatographie, HPLC ; elektrochem. Detektor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A simple quantitative method for the analysis of the residues of sulphadiazine and sulphadimidine in milk is described. The method is based on a simple extraction step and high-performance liquid chromatography (HPLC) with electrochemical detection. The Chromatographic seperation is performed on a reversed phase column (RP-C2) and an aqueous eluent. With this analytical system 10 ng/ml can be detected. Recoveries of sulphonamides from milk are between 94.4% and 110% in the concentration range of 0.01–1.8 μg/ml sample.
    Notes: Zusammenfassung Es wird eine einfache Methode zum Nachweis von Sulfonamidrückständen in Milch am Beispiel von Sulfadiazin und Sulfadimidin beschrieben, mit der noch Rückstandsmengen von 10 ng/ml erfaßbar sind. Das Verfahren besteht aus einem einfachen Aufreinigungsschritt, der Trennung der Rückstände auf einer Umkehrphase (RP-C2) und der Detektion mit einem elektrochemischen Detektor. Die Wiederfindungsraten liegen zwischen 94,4% und 110% für einen Konzentrationsbereich von 0,01–1,8 μg/ml Untersuchungsmaterial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00480118
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of methomyl and methomyl-oxime in fruit crops and water by HPLC (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 309 (1981), S. 8-12 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Methomyl, Methomyl-oxim in Obst und Wasser ; Chromatographie, HPLC ; elektrochem. Detektor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A simple and specific quantitative HPLC method for the analysis of methomyl residues in fruit crops and water is described. The method is based on simple extraction steps, high-performance liquid chromatographic separation using a reversed phase column (RP-C18) and UV detection. With this analytical system, methomyl residues at 1 ng/g level can be detected. This approach allows also the simultaneous determination of methomyl and its degradation product methomyl-oxime. This is possible either by using the UV detector at 233 nm or by using both the UV- and the electrochemical detectors in series. Using this combined detection system, it was possible to determine methomyl at the 1 ng/ml level and methomyl-oxime at the 100 pg/ml level in water. Recovery rate in the range of 0.01–1 μg/g is 101.4±6% in fruit crops (apples) and 93.7±4% in water.
    Notes: Zusammenfassung Es wird eine hochleistungs-flüssigkeits-chromatographische Methode zur quantitativen Bestimmung der Methomylrückstände in Obst und Wasser beschrieben, mit der noch Rückstandsmengen von 1 ng/g (ppb) erfaßbar sind. Das Verfahren besteht aus einem Extraktionsschritt, Aufreinigungsschritt, der Trennung der Rückstände auf einer Umkehrphase (RP-C18) und der UV-Detektion. Die Methode ermöglicht die gleichzeitige Bestimmung von Methomyl und seinem Hydrolyseprodukt (Methomyl-oxim) durch die Anwendung des UV-Detektors allein oder durch zusätzliche elektrochemische Detektion. Durch diese Schaltanordnung wurden Konzentrationen von 1 ng/ml Methomyl und 100 pg/ml (ppt) Methomyl-oxim in Wasser bestimmt. Die Methode gestattet im Bereich von 0,01–1 μg/g eine Wiederfindungsrate von 101,4±6% in Obst (Äpfel) und 93,7±4% in Wasser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00493444
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of propanil in rice, potatoes and water by HPLC (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 312 (1982), S. 536-538 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A simple and specific quantitative HPLC method for the analysis of propanil residues in rice, potatoes and water is described. The method is based on simple extraction steps, column clean-up, HPLC separation using a reversed phase column (RP-C18) and UV-detection. With this analytical system, propanil residues can be detected at the 5 ng/g level in rice and potatoes and at the 1 ng/ml level in water. Recovery rate in the range of 0.005–1 μg/g is 87.3±6.9% in rice and 85.4±8.2% in potatoes and in the range of 0.001–10 μg/ml 95.2±13% in water.
    Notes: Zusammenfassung Eine einfache HPLC-Methode zur quantitativen Trennung und zum Nachweis der Propanilrückstände in Reis, Kartoffeln und Wasser wird beschrieben, mit der noch Mengen im ppb-Bereich erfaßbar sind. Das Verfahren besteht aus einem Extraktionsschritt, Aufreinigung auf einer Kieselgelsäule, der Trennung der Rückstände auf einer Umkehrphase (RP-C18) und der UV-Detektion. Die Methode gestattet im Bereich von 0,005–1 μg/g eine Wiederfindungsrate von 87,3±6,9% in Reis, von 85,4±8,2% in Kartoffeln und im Bereich von 0,001–10 μg/ml eine Wiederfindungsrate von 95,2±13% in Wasser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636075
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of napropamide in rape, rape-seed and rape-straw by HPLC (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 524-526 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A simple and specific quantitative high-pressure liquid-chromatographic method for the analysis of napropamide in rape, rape seeds and rape straw is described. The method is based on a simple extraction step, gel-chromatographic and mini-silicagel column clean-up and separation on a Reversed Phase column with UV-detection. The method is sensitive down to 5 ppb napropamide in green rape and 10 ppb in rape seeds and straw. It shows recoveries between 88.0% and 107% in green rape and between 86.0% and 104% in rape seeds and straw at the 0.05–1.0 mg/kg level.
    Notes: Zusammenfassung Es wird eine einfache und spezifische hochdruckflüssigkeits-chromatographische Bestimmungs-methode zur quantitativen Trennung und zum Nachweis der Rückstände des Herbicides Napropamid in Raps, Rapssamen und Rapsstroh beschrieben. Das Verfahren besteht aus einem einfachen Extraktionsschritt, gel-chromatogra-phischer und Minikieselgelsäulen-Reinigung sowie Trennung auf einer RP-Säule mit anschließender UV-Detektion. Die Methode erreicht eine Nachweisgrenze von 5 ppb für grünen Raps und 10 ppb für Rapssamen und Rapsstroh. Die Wiederfindungsraten liegen im Bereich von 0,05–1,0 mg/kg bei 88,0% bis 107% (grüner Raps) und bei 86,0% bis 104% (Rapssamen).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487631
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