Time-Dependent Movement and Distribution of Chlorpyrifos and Its Metabolism in Bamboo Forest under Soil Surface Mulching

Abstract

The dissipation and distribution of chlorpyrifos (CHP) granule formulation in bamboo forest under soil surface mulching conditions (CP) and noncovered cultivation conditions (NCP) from soil to product were investigated. In the CP treatment, the CHP granule with slow-release effect leached from the topsoil to the subsoil. Conversely, the CHP was fixed in the topsoil (0-5 cm layer) in the NCP treatment, and no obvious leaching effect could be observed. The residue of CHP could be found in bamboo shoots from CP treatment, mainly at the bottom part (5 cm length). CHP could be degraded into 3,5,6-trichloro-2-pyridinol (TCP) in the soil and bamboo shoots. In addition, the straw used as the mulching material with higher OM and pH had some regulatory role in changing the pH and OM characteristics of the soil. Thus the straw could indirectly affect the adsorption and degradation behavior of CHP and TCP in the soil.

Degradation Dynamics and Dietary Risk Assessments of Two Neonicotinoid Insecticides during Lonicera japonica Planting, Drying, and Tea Brewing Processes

“…The relationship between the two pesticide residues and time is C t = C 0 e – kt , where C t (mg/kg) is the residue after time t , C 0 (mg/kg) is the initial residue, and k is the dissipation rate constant (d –1 ). This equation is widely used to assess the level of pesticides in agriproducts. , …”

Migration and Accumulation of Octachlorodipropyl Ether in Soil-Tea Systems in Young and Old Tea Gardens

“…All figures were drawn using the software Origin Pro 9.0 (Origin Lab Corporation, Northampton, MA, USA). The relationship between OCDPE residues and time is C t = C 0 e −kt [ 23 ], where C t (mg/kg) is the residue after time t, C 0 (mg/kg) is the initial residue, and k is the dissipation rate (accumulation rate) constant (d −1 ). The exponential equation was analyzed using the Exp2PMod1 function of the software Origin Pro 9.0.…”

Characterisation and in vitro cytotoxicity of toxic and degradation compounds in bamboo shoots (Dendrocalamus Sinicus) during traditional fermentation

“…Bamboo shoot (BS) has been consumed as food and medicine for a long time in Asia especially China (Singhal et al ., 2013). China has the richest bamboo resources (over 500 species, 39 genera) and the largest production and exportation of BS (Liu et al ., 2014; Wang et al ., 2020). BS has been prepared, and fermented BS is considered as one of the highly palatable delicacies especially for some ethnic groups (e.g.…”