Novel method for in situ investigation into graphene quantum dots effects on the adsorption of nitrated polycyclic aromatic hydrocarbons by crop leaf surfaces

The Kinetics and Mechanisms for Photodegradation of Nitrated Polycyclic Aromatic Hydrocarbons on Lettuce Leaf Surfaces: An In Vivo Study

“…The GQD solutions with a concentration of 8 mg L –1 were made following the sequential steps: dispersion in methanol, sonication for 15 min, and incubation on the laboratory bench overnight. Stock solutions of the two NPAHs dissolved in methanol (500 μg L –1 ) were prepared according to our published method …”

“…Moreover, compared to the corresponding parent PAHs, the higher octanol-air partition coefficient ( K OA ) values of NPAHs facilitate higher partition toward a more hydrophobic phase . Previous research reported that living vegetation cuticles could effectively accumulate SOCs from the ambient air due to the presence of a hydrophobic wax layer, which significantly affected the environmental fates of SOCs. , Therefore, the environmental behaviors of NPAHs on plant leaf surfaces deserve special concern.…”

“…Thus, investigation into the environmental behaviors of NPAHs in/on vegetable leaves should be given special attention. Herein, inspired by the uptake process of the leaf, we reported after in situ fluorescence probe analysis that most of the NPAHs were prone to being retained on leaf surfaces rather than through penetration into inner tissues. It has been well documented that photochemical degradation is one of the important removal pathways of NPAHs. , Moreover, degradation of NPAHs in many media, including organic solvents, , snow, and solid material surfaces, has been linked to photolysis.…”

“…To date, the advance of graphene quantum dots (GQDs) as a fluorescence probe, constituting a zero-dimensional photoluminescence carbon that exhibits quantum-size effects has aroused much scientific interest in analytical science, such as the analysis of pesticides and Pseudomonas aeruginosa in food samples. On the basis of GQDs as a fluorescence probe, the fiber-optic fluorimetry was employed to develop a new fluorescence quenching method for the in vivo measurement of 3-nitrofluoranthene and 9-NAnt sorbed on living corn and soybean leaf surfaces in our recent study . However, the question of whether GQDs as a novel fluorescence probe could be used for the in vivo quantification of other NPAH chemicals on the leaf surfaces of living vegetable species remained unclear.…”

The depuration fate of the mixtures of CdS/ZnS quantum dots (QDs) with different surface coatings on mangrove and wheat root epidermis: results from a novel method

“…Semiconductor quantum dots (QDs) have been classified as a new class of engineered nanomaterials (ENMs), which are used in many applications due to their unique optical and electrical properties [1][2][3], and global production reached 55 t/y in 2012 [4,5]. The growing prevalence of QDs, especially metal-based QDs, in conjunction with the risk of unwanted/unanticipated biota exposure renders them a potential concern [6, 7].…”