scholarly journals Response surface methodology applied to SPE for the determination of ibuprofen in various types of water samples

2013 ◽  
Vol 36 (19) ◽  
pp. 3220-3225 ◽  
Author(s):  
Paula Paíga ◽  
Cristina Delerue-Matos
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Water Samples

scholarly journals Determination of OCPs and PCBs in environmental water samples by GC-DLLME optimized by Response Surface Methodology

2019 ◽  
Vol 20 (46) ◽  
pp. 13-23
Author(s):  
Dekun Hou ◽  
Otgonbayar Khureldavaa ◽  
Fujin Zhang ◽  
Jiang He ◽  
Badgaa Amarsanaa
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Lake Water ◽  
Water Samples ◽  
Tap Water ◽  
Environmental Water ◽  
Enrichment Factors ◽  
Environmental Water Samples ◽  
Relative Standard

A new sample preparation procedure to determine seven organochlorine pesticides and seven polychlorinated biphenyls in environmental water samples by using a combination of ultrasonic-assisted solvent extraction and dispersive liquid-liquid micro-extraction was established, and the extracted analytes were analyzed by gas chromatography coupled with electron capture detector. Some parameters influencing the extraction efficiency were studied and optimized utilizing response surface methodology. Under the optimum extraction conditions, the method showed wide linear ranges with r2 > 0.9989 and low limits of detection and quantification between 0.16 ~ 2.17 μg/L and 0.53 ~ 7.16 μg/L, respectively. Enrichment factors (EF) were high and ranged from 63 to 116. Relative standard deviations (RSDs) for the extraction of 25 μg/L of each selected OCPs and PCBs were less than 10.2 %. The proposed method was successfully used for targets contaminations determination in different water samples. α-HCH, β-HCH and p,p’-DDE were found in lake water closed to farmland with concentrations of 2.56 μg/L, 4.44 μg/L and 4.74 μg/L, respectively, and other OCPs and PCBs were not found in the corresponding water samples. The relative recoveries of OCPs and PCBs from tap water, river water and lake water at spiking levels of 10 μg/L were in the range of 81.9 ~ 109.7 %, within a relative standard deviation of 1.7 ~ 11.8 %. The results revealed that the proposed method was well suited for the determination of trace amounts of target contaminations in liquid samples.

scholarly journals Determination of Optimum Composition of Fermentation Medium for Citric Acid Production from Watermelon Rinds using Response Surface Methodology

2017 ◽  
Vol 1 (1) ◽  
pp. 12-16
Author(s):  
Andrew Amenaghawon ◽  
◽  
Oluwatoba Salokun ◽  
Justina Okhonmina ◽  
Imuetinyan Egharevba ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Citric Acid ◽  
Response Surface ◽  
Acid Production ◽  
Fermentation Medium ◽  
Optimum Composition ◽  
Citric Acid Production
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