Green analytical method based on salt assisted graphene oxide dispersive solid phase extraction of symmetrical triazine herbicides in environmental water samples for liquid chromatographic determination

Fast surface floating organic droplets based dispersive liquid‐liquid microextraction for trace enrichment of multiclass pesticide residues from different fruit juice samples followed by high performance liquid chromatography–diode array detection analysis

“…As can be seen in Table 1, for the target multiclass pesticides, linearity was expressed with correlation coefficients (r 2 ) ranging from 0.998 to 0.999. LOD and LOQ were computed using the following equations: $$\frac{{3{{\sigma}}}}{m}$$ and $$\frac{{10{{\sigma}}}}{m}$$, respectively, from the standard deviation (σ) of the nine blank signal analyses of reagent water and slope (m) of the working curve [42]. Hence, the LODs and LOQs were obtained in the range of 0.021−0.053 and 0.042−0.180 ng/ml, respectively.…”

“…The sample solution pH is the most important variable in the extraction of targeted compounds since it enables them to be identified in the uncharged state so as to easily dissolve in the organic phase rather than the aqueous phase [4,42,43]. To investigate the influence of pH on extraction efficiency, the pH of the sample solutions was tested in the range of 3 and 9, adjusted by 0.1 M HCl or/and 0.1 M NaOH solution, before being subjected to DLLME−SFOD.…”

A Highly Selective Analytical Method Based on Salt-Assisted Liquid-Liquid Extraction for Trace-Level Enrichment of Multiclass Pesticide Residues in Cow Milk for Quantitative Liquid Chromatographic Analysis

“…In SALLE, the sample solution pH also has a significant role on the extraction efficiency of the multiclass pesticides, as it affects the extent of their ionization as well as the solubility in aqueous media [ 35 , 51 , 55 ]. The effect of this parameter was evaluated by carrying out a series of experiments varying the pH values from 3.0 to 9.0 in the aqueous solution.…”

“…The sensitivity of the method guaranteed the detection and confirmation of pesticide residues in milk found at levels below or above the limits of detection (LODs). The calculations for LODs and limits of quantitation (LOQs) were based on the standard deviation ( σ ) of the seven extraction responses of blank milk for each type of milk samples and the slope of the calibration curve (S) using equations 3 × σ / S and 10 × σ / S , respectively [ 55 ]. The results are given in Table 1 , showing that the LODs ranged from 0.58 to 2.56 ng·mL −1 while LOQs from 1.95 to 8.51 ng·mL −1 .…”

The non-edible and disposable parts of oyster mushroom, as novel adsorbent for quantitative removal of atrazine and its degradation products from synthetic wastewater

“…In addition to their potential toxicity, persistence, and water solubility, pesticides are utilized extensively, which raises concerns about their analysis in natural waters [ 12 ]. They have been determined from a number of environmental matrices such as water [ 4 , 8 , 13 ], fruit [ 14 ], honey [ 15 ], fish [ 16 ], crops [ 17 ], leafy vegetables [ 18 , 19 ], tobacco [ 20 , 21 ], coconut [ 22 ], fruit-based soft drinks [ 23 , 24 ], soil [ 25 , 26 ], and ambient air [ 27 , 28 ].…”