Distinct uptake and accumulation profiles of triclosan in youdonger (Brassica campestris subsp. Chinensis var. communis) under two planting systems: Evidence from 14C tracing techniques. (February 2022)

• Record Type: Journal Article
• Authors: Nie, Enguang; Wang, Haiyan; Chen, Yan; Lu, Yuhui; Akhtar, Kashif; Riaz, Muhammad; Zhang, Sufen; Yu, Zhiyang; Ye, Qingfu
• Is Part Of: Chemosphere. Volume 288:Part 3(2022)
• Publication Date: 2022-02
• Subjects: Uptake -- Vegetable -- Soil pore water -- Triclosan -- Hydroponics; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.132651
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Triclosan is a widely used biocide against microorganisms and is ubiquitously distributed in the environment. Triclosan can be accumulated into plants from soil and hydroponic media. However, little information is currently available on the comparative fate of triclosan in plants under soil and hydroponics cultivation conditions and factors governing uptake. Therefore, this study was designed to comparatively elucidate the uptake mechanism of 14 C-triclosan in youdonger ( Brassica campestris subsp. Chinensis var. communis ) grown under different soils and hydroponics and clarify dominant uptake factors. Results showed that 77.2% of 14 C were accumulated in youdonger grown in a hydroponic system, while only 1.24%–2.33% were accumulated in the two soil-planting systems. In addition, the bioconcentration factor (BCF) of 14 C-triclosan in soil-plant systems was approximately 400-fold smaller than that in the hydroponics. In the soil-planting system, a strong linear correlation was found between concentrations of triclosan in soil pore water and youdonger plant (R 2 > 0.85, p < 0.01) at different incubation times. Therefore, triclosan in pore water might be a good indicator to estimate its accumulation in plants and is significantly affected by soil pH, clay, and organic matter contents. The estimated average dietary intakes of triclosan for youdonger grown in hydroponic and soil-planting systems were estimated to be 1.31 ng day −1 kg −1 and 0.05–0.12 ng day −1 kg −1, respectively, much lower than the acceptable dietary intakes of triclosan (83 μg day −1 kg −1 ), indicating no significant human health risks from youdonger consumption. This study provided insights into uptake routes of triclosan into youdonger plants from both soil and hydroponic systems, bioavailability of triclosan in different soils, and further assessment of human exposure to triclosan from youdonger. Graphical abstract: Image 1 Highlights: The BCF of triclosan in hydroponics was nearly 400 times that in soil-plant system. The free triclosan was a crucial factor on uptake into the vegetable. Triclosan in soil pore water was affected by soil pH, clay and OM. No appreciable health risk to human via the consumption of the vegetable.