کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
95255 160423 2015 10 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Classification of Brazilian and foreign gasolines adulterated with alcohol using infrared spectroscopy
ترجمه فارسی عنوان
طبقه بندی بنزین برزیلی و خارجی با الکل با استفاده از اسپکتروسکوپی مادون قرمز
کلمات کلیدی
مادون قرمز متوسط؛ گازوئیل؛ علم پزشکی قانونی؛ SIMCA؛ PLS-DA؛ انتقال طبقه بندی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Method based on middle infrared spectroscopy to classify gasoline as to its origin.
• PLS-DA and SIMCA techniques used to build classification models.
• The direct standardization method evaluated to transfer the classification models.
• Results indicate that both PLS-DA and SIMCA were effective after performing DS.

The smuggling of products across the border regions of many countries is a practice to be fought. Brazilian authorities are increasingly worried about the illicit trade of fuels along the frontiers of the country. In order to confirm this as a crime, the Federal Police must have a means of identifying the origin of the fuel. This work describes the development of a rapid and nondestructive methodology to classify gasoline as to its origin (Brazil, Venezuela and Peru), using infrared spectroscopy and multivariate classification. Partial Least Squares Discriminant Analysis (PLS-DA) and Soft Independent Modeling Class Analogy (SIMCA) models were built. Direct standardization (DS) was employed aiming to standardize the spectra obtained in different laboratories of the border units of the Federal Police. Two approaches were considered in this work: (1) local and (2) global classification models. When using Approach 1, the PLS-DA achieved 100% correct classification, and the deviation of the predicted values for the secondary instrument considerably decreased after performing DS. In this case, SIMCA models were not efficient in the classification, even after standardization. Using a global model (Approach 2), both PLS-DA and SIMCA techniques were effective after performing DS. Considering that real situations may involve questioned samples from other nations (such as Peru), the SIMCA method developed according to Approach 2 is a more adequate, since the sample will be classified neither as Brazil nor Venezuelan. This methodology could be applied to other forensic problems involving the chemical classification of a product, provided that a specific modeling is performed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forensic Science International - Volume 253, August 2015, Pages 33–42
نویسندگان
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