Raman spectrometry used for rapidly detecting paraquat in fruit and vegetable on site

Abstract

Raman spectrometry used for rapidly detecting paraquat in fruit and vegetable on site is characterized by comprising diluting a sample (Chinese cabbage, cucumber, tomato, asparagus lettuce, pear, apple, grape, orange, etc) by using first water or deionized water according to the mass ratio of 1:1, centrifuging at room temperature at a speed of 10000-15000 rpm for 5-15 min, adsorbing the centrifuged homogenized supernatant and adding into a detection pool added with 2 mL of a detection reagent in advance, performing eddying or shaking for 0.3-1 min for homogenization, and performing rapid quantitative and qualitative determination on trace paraquat residue in fruit and vegetable by employing a Raman spectrometry external standard method according to the linear corresponding relation between the Raman spectrum scattering signal intensity of paraquat at the characteristic wave number position of 1665 cm<-1> and the paraquat content. The method is simple in sample pre-treatment, low in reagent cost and easy for popularization.

Description

technical field [0001] The invention relates to a detection method, in particular to a Raman spectroscopy method for on-site rapid detection of paraquat in fruits and vegetables. Background technique [0002] Paraquat is a quick-acting contact-killing quaternary ammonium salt herbicide. It has contact and certain systemic effects. It can be quickly absorbed by the green tissue of the plant and cause it to die. It has no effect on the non-green tissue. In the soil, it quickly combines with the soil to purify, and is ineffective on plant roots, perennial rhizomes and perennial roots. It can control various annual weeds; it has a strong killing effect on perennial weeds, but its underground stems and roots can sprout new branches; it has no effect on brown stems and trunks that have been lignified. It is suitable for controlling weeds in orchards, mulberry gardens, rubber gardens and forest belts, and can also be used to prevent weeds in non-cultivated land, field ridges and r...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a rapid detection method for paraquat in fruits and vegetables, which is low cost, easy to operate, capable of on-site detection, and easy to popularize and popularize, thereby achieving timely discovery and monitoring management of paraquat residues, overcoming the current Pesticide residue detection is cumbersome and complicated

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