A novel calibration transfer method of NIR spectra to identify ultra-low concentration of pesticide residues

Determination of pesticide residues in a wide variety of matrices is an ongoing challenge due to low concentration and substantial amounts of interfering endogenous compounds that can be coextracted with...

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Calibration transfer method for the quantitative analysis of high-temperature materials with stand-off laser-induced breakdown spectroscopy

Journal of Analytical Atomic Spectrometry ◽

10.1039/b508528d ◽

2005 ◽

Vol 20 (11) ◽

pp. 1275 ◽

Cited By ~ 19

Author(s):

Cristina López-Moreno ◽

Santiago Palanco ◽

J. Javier Laserna

Keyword(s):

High Temperature ◽

Quantitative Analysis ◽

Laser Induced Breakdown Spectroscopy ◽

Calibration Transfer ◽

Breakdown Spectroscopy ◽

High Temperature Materials ◽

Laser Induced Breakdown ◽

Transfer Method

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Modified linear model correction: A calibration transfer method without standard samples

NIR news ◽

10.1177/0960336018804395 ◽

2018 ◽

Vol 29 (8) ◽

pp. 24-27 ◽

Cited By ~ 2

Author(s):

Jin Zhang ◽

Xiaoyu Cui ◽

Wensheng Cai ◽

Xueguang Shao

Keyword(s):

Linear Model ◽

Near Infrared ◽

High Efficiency ◽

Correction Method ◽

Standard Samples ◽

Calibration Transfer ◽

Practical Applications ◽

Model Correction ◽

Transfer Method ◽

Model Similarity

Calibration transfer without standard samples is essential for practical applications of near infrared spectroscopy because, sometimes, it is difficult or even impossible to obtain the standard samples for measuring their spectra on the secondary instrument. In this work, a modified linear model correction method is proposed for improving the transfer accuracy and computational efficiency. The constraint of linear model correction was replaced by a robust convex equation to restrict the model similarity in the optimization. The near infrared dataset of pharmaceutical tablet measured with different instruments are used to test the performance of the method. The result shows that a modified linear model correction achieves a high efficiency of the transfer while the computational complexity can be considerably reduced. The method may provide a robust way in practical application.

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Confirmation of Pesticide Residue Identity. II. Derivative Formation in Solid Matrix for the Confirmation of DDT, DDD, Methoxychlor, Perthane, cis- and trans-Chlordane, Heptachlor, and Heptachlor Epoxide Pesticide Residues by Gas Chromatography

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/55.3.1058 ◽

1972 ◽

Vol 55 (5) ◽

pp. 1058-1066

Author(s):

Alfred S Y Chau ◽

M Lanouette

Keyword(s):

Gas Chromatography ◽

Pesticide Residue ◽

Pesticide Residues ◽

Heptachlor Epoxide ◽

High Yield ◽

Solid Matrix ◽

New Approach ◽

Low Concentration ◽

Present Procedure ◽

Cis And Trans

Abstract A new approach has been developed for the simultaneous confirmation of DDT-type compounds, chlordanes, heptachlor, and heptachlor epoxide. Derivatives are formed by a solid matrix derivation technique in alumina/KOH and alumina/potassium tert.-butoxide. It is compared with the previously reported solution derivation technique. The high yield and simplicity of the present procedure should be useful in routine analysis, particularly for samples with a low concentration of the parent pesticide.

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