2.3. Analytical method
The water samples were analyzed for temperature, pH, dissolved oxygen and COD as per standard procedures (APHA, 1998). However, for HPLC analysis, the water samples extracted in n-hexane reagent were allowed to dry at 70 °C using a vacuum rotary evaporator. The dried residue was then dissolved in 10 ml methanol (GR grade) and filtered through a 0.2 μm membrane. An aliquot 20 μL, was taken from the organic phase and the quantification of Cypermethrin was carried out using HPLC method described earlier (Jilani and Khan, 2006). Each sample was analyzed three times to obtain mean value.
2.4. High pressure liquid chromatography (HPLC)
HPLC (Shimadzu, Japan) chromatography system consisted of a solvent delivery pump LC-10 AS, connected with an autoinjector model SIL-6A and a rheodyne injection valve fitted with a sample loop (20 μl). The chromatographic separation was achieved on a reverse phase C18 column with a guard column and monitored by UV-detector (visible spectrophotometer detector SPD-10A) set at 220 nm. The output of the detector was connected to a chromatopack (CR6A). The mobile phase consisted of methanol (Merck HPLC grade) since Cypermethrin is miscible with alcohol. The filtered methanol was degassed prior to use by sonication. The flow rate was adjusted at 2 ml/min with total elution time of 10 min for each run.
3. Results and discussion
2.3. Analytical method
The water samples were analyzed for temperature, pH, dissolved oxygen and COD as per standard procedures (APHA, 1998). However, for HPLC analysis, the water samples extracted in n-hexane reagent were allowed to dry at 70 °C using a vacuum rotary evaporator. The dried residue was then dissolved in 10 ml methanol (GR grade) and filtered through a 0.2 μm membrane. An aliquot 20 μL, was taken from the organic phase and the quantification of Cypermethrin was carried out using HPLC method described earlier (Jilani and Khan, 2006). Each sample was analyzed three times to obtain mean value.
2.4. High pressure liquid chromatography (HPLC)
HPLC (Shimadzu, Japan) chromatography system consisted of a solvent delivery pump LC-10 AS, connected with an autoinjector model SIL-6A and a rheodyne injection valve fitted with a sample loop (20 μl). The chromatographic separation was achieved on a reverse phase C18 column with a guard column and monitored by UV-detector (visible spectrophotometer detector SPD-10A) set at 220 nm. The output of the detector was connected to a chromatopack (CR6A). The mobile phase consisted of methanol (Merck HPLC grade) since Cypermethrin is miscible with alcohol. The filtered methanol was degassed prior to use by sonication. The flow rate was adjusted at 2 ml/min with total elution time of 10 min for each run.
3. Results and discussion
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