Dissipation of tiafenacil in five types of citrus orchard soils using the HPLC‐MS coupled with the quick, easy, cheap, effective, rugged, and safe method

Abstract

Tiafenacil is a new contact herbicide and its environmental behavior after field application remains poorly understood. In order to understand the dissipation of tiafenacil in the soil, the tiafenacil dissipation experiment was conducted at citrus orchard sites in five provinces of China (Gansu, Shandong, Sichuan, Jiangxi, and Hainan) in 2019 and 2020 (July-August) and the relevant determination methods were optimized. The results showed that the established method showed good linearity in the concentration range of 0.01-0.5 mg/kg. The average recoveries of tiafenacil from the five soils were 86.31-101.66%, with coefficients of variation of 0.28-10.79%. The dissipation of tiafenacil at the five experimental sites conformed to the first-order kinetic equation, C t = C 0 exp −kt (R 2 = 0.8130 -0.9967). The half-life of tiafenacil ranged from 0.26 to 4.19 days. The dissipation rate of tiafenacil was positively correlated with soil organic matter content and negatively correlated with soil pH, while monthly average temperature and total rainfall were less influential than soil properties. Therefore, the established method was simple and effective for tiafenacil residue analysis in citrus orchard soils. Tiafenacil could readily dissipate in soil and might be a safe alternative to glyphosate for weed control in citrus orchards.

Method validation and residue analysis of methoxyfenozide and metaflumizone in Chinese broccoli under field conditions by liquid chromatography with tandem mass spectrometry

“…ME refers to the difference between the mass spectrometric response of analyte in neat solvent and the response of the same analyte in the matrix, resulting from the alteration of ionization efficiency of target analytes in the presence of co-eluting compounds. MEs can be calculated by the following Equation (1) [24]:…”

Protective effect of Peucedanum praeruptorum Dunn extract on oxidative damage of LLC‑PK1 cells induced by H2O2

“…The dry root donor-part of Peucedanum praeruptorum Dunn is currently used in traditional Chinese medicine, exerting an effect on exogenous wind-heat; lung heat and phlegm depression; cough, asthma, and phlegm; and tightness in the chest and diaphragm (1). The root of Peucedanum praeruptorum Dunn contains a variety of coumarin compounds and these active substances are also independently used in health products (2)(3)(4)(5).…”

Simultaneous determination of nine tyrosine kinase inhibitors in three complex biological matrices by using high‐performance liquid chromatography–diode array detection combined with a second‐order calibration method

“…It has been reported that the simultaneous analysis of the above nine TKIs using HPLC–diode array detection (DAD) required a running time of 17.5–35 min [8–11]. LC–MS and LC–MS/MS have high analytical SEN [12–14]. However, they are expensive, have high maintenance costs, and need professional technicians to operate.…”