Department of Science, Faculty of Science and Technology, Prince of Songkla University Pattani Campus, Pattani 94000, Thailand.
Mahidol University, Nakhonsawan Campus, Nakhonsawan 60130, Thailand.
Mar Pollut Bull. 2018 Feb;127:320-333. doi: 10.1016/j.marpolbul.2017.12.021. Epub 2017 Dec 21.
This study determines uptake and accumulation of radionuclides and heavy metals by Pluchea indica and Avicennia marina and evaluates phytoremediation potential via greenhouse and field experiments. P. indica and A. marina are considered excluders for K and Ra, and Pb since roots accumulated them in higher quantities compared to other plant parts, and the bioconcentration factor (BCF) and transfer factor (TF) values for Pb, and K and Ra were >1, respectively. Absorbed dose rate in air (D) showed significant values in sediments, which were generally over the maximum recommended value of 55nGyh. Phytostabilization of radionuclides and heavy metals may serve as an appropriate strategy for mangrove-polluted areas. D values in sediments were considered sufficiently high to recommend long-term monitoring. Radionuclide activities may increase in the food chain via uptake and accumulation of edible plants, ultimately resulting in harm to human health.
本研究通过温室和田间实验，确定了斑茅和海桑对放射性核素和重金属的吸收和积累情况，并评估了其植物修复潜力。斑茅和海桑被认为是钾和镭以及铅的外排植物，因为与其他植物部位相比，根部积累了更多的这些元素，而且铅、钾和镭的生物浓缩因子 (BCF) 和转移因子 (TF) 值分别大于 1。空气中的吸收剂量率 (D) 在沉积物中显示出显著值，这些值通常超过 55nGyh 的最大推荐值。放射性核素和重金属的植物稳定化可能是红树林污染地区的一种合适策略。沉积物中的 D 值被认为足够高，建议进行长期监测。放射性核素活性可能通过可食用植物的吸收和积累而增加食物链中的含量，最终对人类健康造成危害。
