Stephan Perrine, Le Roux Yves, Gaspard Sarra, Michaux Florentin, Feidt Cyril, Soligot Claire, Rychen Guido, Delannoy Matthieu
Université de Lorraine, INRAE, URAFPA, 54000, Nancy, France.
Laboratoire COVACHIM-M2E, EA 3592, Université Des Antilles, Guadeloupe, France.
Environ Sci Pollut Res Int. 2023 Jan;30(3):5873-5880. doi: 10.1007/s11356-022-21885-5. Epub 2022 Aug 19.
The use of biochars (BCs) and activated carbons as a way of sequestering soil-bound pollutants such as chlordecone (CLD) is increasingly being studied. This study aims at assessing the impact of Sargassum BC/AC particle size and Sargassum BC amendment rate on CLD adsorption in Nitisol and in Andosol. Four different types of carbonaceous matrices were tested: Sargasso carbon activated by phosphoric acid (SargHPO), Sargasso carbon activated by steam (SargHO), biochar of Sargasso (Ch Sarg700), and a commercial activated carbon (ORBO™). In a first experiment, CLD contaminated Andosol and Nitisol were amended with 2% of each carbonaceous matrix divided into four particles size classes (< 50 µm, 50-150 µm, 150-200 µm, and > 200 µm). In a second experiment, the contaminated soils were amended with the biochar of Sargasso at five application rates (0, 0.25, 0.5, 1, and 2% (w/w)). After a 4-month aging, environmental availability tests were carried out on the soils of both experiments. The results of the first experiment showed that the best reductions of CLD environmental availability were obtained in both soils with the biochar of Sargasso and the ORBO™. More specifically, in nitisol, particle size under 50 µm of biochar of Sargasso and AC ORBO™ showed a CLD environmental availability reduction up to 72 ± 2.6% and 79 ± 2.6%. In Andosol, there was no significant difference between the three particle sizes (< 50 µm, 50-150 µm, and 150-200 µm) of the biochar of Sargasso on the reduction of environmental availability (average reduction of 43 ± 2.5%). The results of the second experiment showed that an amendment rate increase improves the immobilization of CLD. When the amendment rate was increased from 0.25 to 2%, the environmental availability was reduced by 43% in Nitisol and 50% in Andosol.
作为一种固定土壤中污染物（如十氯酮，CLD）的方式，生物炭（BCs）和活性炭的应用正越来越多地被研究。本研究旨在评估马尾藻生物炭/活性炭的粒径以及马尾藻生物炭添加率对铁铝土和火山灰土中CLD吸附的影响。测试了四种不同类型的碳质基质：磷酸活化的马尾藻碳（SargHPO）、蒸汽活化的马尾藻碳（SargHO）、马尾藻生物炭（Ch Sarg700）和一种商业活性炭（ORBO™）。在第一个实验中，用2%的每种碳质基质对受CLD污染的火山灰土和铁铝土进行改良，每种碳质基质分为四个粒径等级（<50 µm、50 - 150 µm、150 - 200 µm和>200 µm）。在第二个实验中，用五种施用量（0、0.25、0.5、1和2%（w/w））的马尾藻生物炭对受污染土壤进行改良。经过4个月的老化后，对两个实验的土壤进行环境有效性测试。第一个实验的结果表明，在两种土壤中，马尾藻生物炭和ORBO™对CLD环境有效性的降低效果最佳。更具体地说，在铁铝土中，粒径小于50 µm的马尾藻生物炭和AC ORBO™使CLD环境有效性降低了72±2.6%和79±2.6%。在火山灰土中，马尾藻生物炭的三种粒径（<50 µm、50 - 150 µm和150 - 200 µm）在降低环境有效性方面没有显著差异（平均降低43±2.5%）。第二个实验的结果表明，添加率的增加会提高CLD的固定效果。当添加率从0.25%增加到2%时，铁铝土中的环境有效性降低了43%，火山灰土中降低了50%。
