Room-temperature excitation–emission phosphorescence matrices and second-order multivariate calibration for the simultaneous determination of pyrene and benzo[a]pyrene

2007 ◽  
Vol 584 (2) ◽  
pp. 287-294 ◽  
Author(s):  
Juan A. Arancibia ◽  
Graciela M. Escandar
Keyword(s):  
Simultaneous Determination ◽  
Room Temperature ◽  
Multivariate Calibration ◽  
Second Order

scholarly journals Simultaneous Determination of Pesticides in Fruits by Using Second-Order Fluorescence Data Resolved by Unfolded Partial Least-Squares Coupled to Residual Bilinearization

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Mercedes Villar Navarro ◽  
Miguel Angel Cabezón ◽  
Patricia C. Damiani
Keyword(s):  
Least Squares ◽  
Simultaneous Determination ◽  
Partial Least Squares ◽  
Multivariate Calibration ◽  
Second Order ◽  
World Health ◽  
Official Control ◽  
Inner Filter Effects ◽  
Filter Effects

In the present work, a chemometric-assisted spectrofluorimetric method has been developed for the simultaneous determination of natural fluorescent pesticides, carbaryl, carbendazim, and thiabendazole, in orange and banana. Only a simple extraction with methanol was required as sample pretreatment. Emission-excitation fluorescence matrices were obtained and resolved by using a second-order multivariate calibration method based on unfolded partial least-squares combined with residual bilinearization (U-PLS/RBL) for achieving “second-order advantage.” In this way, pesticides were determined in fruits even in the presence of inner filter effects, background interactions, strong spectral overlapping, and unexpected components. U-PLS can cope with effects that cause trilinearity loss such as, inner filter effects, including background in the calibration set; meanwhile, RBL allows to resolve the presence of unexpected components. The extraction technique was validated against a commonly applied technique based on the use of ethyl acetate and sodium sulfate. Besides, results obtained for real samples were statistically compared with those obtained by using HPLC. LODs of 0.038, 0.054, and 0.018 mg·kg−1 and 0.044, 0.072, and 0.020 mg·kg−1 were obtained for carbaryl, carbendazim, and thiabendazole in banana and orange samples, respectively; values were in accordance with the MRLs (Maximum Residue Limits) established by different official control organizations such as National Food Safety and Quality Service (SENASA), Codex Alimentarius (based on Food and Agriculture Organization (FAO) of the United Nations and World Health Organization (WHO), and Environmental Protection Agency (EPA).

scholarly journals Development of multivariate calibration method for simultaneous determination of nickel, lead and zinc in tap water

2015 ◽  
Vol 18 (2) ◽  
pp. 145-151
Author(s):  
Chau Minh Huynh ◽  
Thu Du Ly ◽  
Thach Thai Pham ◽  
Tran Thi Bao Pham ◽  
Minh Khanh Duong ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Absorption Spectra ◽  
Multivariate Calibration ◽  
Tap Water ◽  
Calibration Method ◽  
Calibration Model ◽  
Determination Of Nickel ◽  
Lead And Zinc ◽  
Nickel Lead

Conventional spectrophotometric methods for simultaneous determination of nickel, lead and zinc in forms of complexes with a reagent is not feasible due to the overlap of their absorption spectra. A multivariate calibration method was used to overcome this problem. In this study, the calibration model was constructed based on absorption spectra of 30 mixture standards in the range from 490 to 600 nm. Factors influencing experimental results such as amount of reagents, pH, and color development time were optimized. The standard calibration ranges for determination of nickel, lead and zinc were found at 0.5-5 ppm. The method was applied for determination of these ions in tap water samples at ppm level, with recoveries (and RSD) of nickel, lead and zinc were 103.3 % (3.0 %), 74.9 % (11.5 %) and 104.6 % (4.6 %), respectively.

Electrochemical Studies of an Iron Porphyrin Immobilized on Nb2O5/SiO2 and Its Application for Simultaneous Determination of Dopamine and Ascorbic Acid Using Multivariate Calibration Methodology

2007 ◽  
Vol 19 (24) ◽  
pp. 2543-2550 ◽  
Author(s):  
Tatiane Skeika ◽  
Crislaine Marcovicz ◽  
Shirley Nakagaki ◽  
Sérgio Toshio Fujiwara ◽  
Karen Wohnrath ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Simultaneous Determination ◽  
Multivariate Calibration ◽  
Iron Porphyrin ◽  
Electrochemical Studies

Potentiality of PARAFAC approaches for simultaneous determination of N-acetylcysteine and acetaminophen based on the second-order data obtained from differential pulse voltammetry

Talanta ◽  
2019 ◽  
Vol 192 ◽  
pp. 439-447 ◽  
Author(s):  
Khalil Zarnousheh Farahani ◽  
Ali Benvidi ◽  
Masoud Rezaeinasab ◽  
Saleheh Abbasi ◽  
Mohammad Abdollahi-Alibeik ◽  
...  
Keyword(s):  
Differential Pulse Voltammetry ◽  
Simultaneous Determination ◽  
Differential Pulse ◽  
Second Order ◽  
Pulse Voltammetry
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