Determination of Chlorpyrifos Residue by Near-Infrared Spectroscopy in White Radish Based on Interval Partial Least Square (iPLS) Model

Abstract

This article presents a multivariate method of rapidly determining chlopyrifos residue in white radish, based on near-infrared spectroscopy and partial least squares (PLS) regression. Interval PLS (iPLS) was utilized to select the optimum wave number range. The number of PLS components and the number of intervals were optimized according to root mean square error of prediction (RMSEP) and correlation coefficient (R) in prediction set. The result showed that the iPLS model was more reliable than the full model and that near-infrared spectroscopy with iPLS algorithm could be used successfully to analyze chlorpyrifos residue in white radish.

Keywords:

• Chlorpyrifos residue
• interval partial least square (iPLS)
• near-infrared transmission spectroscopy

Financial support from the Ceeusro combination projects of the Education Ministry of Guangdong Province (No. 2007A090302100) and Standard Item (07dz05019) of Science and Technology Commission of Shanghai Municipality are gratefully acknowledged.

Notes

^a SD, standard deviation.

^a Results measured in concentration (w/v).