蓝细菌在温暖的环境中增殖,营养丰富的环境和释放有毒的次级代谢产物(例如,氰毒素,anabaenoptins,等。)进入自然水域。使用有毒的次级代谢产物-污染的水灌溉作物可能会使人类和生物群暴露于氰基毒素,但是,如果农业土壤可以吸收和保留氰基毒素,风险可能很低。在这份报告中,我们通过分批吸附程序比较了多类氰基毒素/anabaenoptin在各种性质的土壤中的吸附和解吸能力。目标化合物是anabaenopeptin-A,anabaenoptin-B,Anatoxin-a,圆柱形精氨素,和微囊藻毒素-LR,-RR,-洛杉矶,-LY,-LW,和-LF。基于固液分配系数(Kd),我们将圆柱精蛋白和微囊藻毒素-LA/-LY分类为“非常低的吸附性”,anabaenoptin-A,B和微囊藻毒素-LR,-LF,和-LW为“低吸附率”,Anatoxin-a和微囊藻毒素-RR作为“中等吸附性”。由于CYN和MC-LA/-LY的亲和力相对较低,土壤中的解吸比例(%)较高,因此我们仍然担心用被高CYN和MC-LA/-LY污染的水灌溉农田。结果还表明,土壤吸附可能是Anatoxin-a和微囊藻毒素-RR的有效固定途径。产生的数据将有助于优先研究可能由土壤基质释放的生物利用度最高的氰基毒素/anabaenopeptin,用于环境风险评估。
Cyanobacteria proliferate in warm, nutrient-rich environments and release toxic secondary metabolites into natural waters. Using cyanotoxin-contaminated water to irrigate crops could expose humans and biota, but the risk may be low if agricultural soils can sorb and retain cyanotoxins. In this report, we compared the sorption and desorption capacities of multi-class cyanotoxins/anabaenopeptins in soils of variable properties with a batch sorption procedure. The target compounds were anabaenopeptin-A, anabaenopeptin-B, anatoxin-a,
cylindrospermopsin, and microcystins -LR, -RR, -LA, -LY, -LW, and -LF. Based on solid-liquid distribution coefficients (Kd), we classified
cylindrospermopsin and microcystin-LA/-LY as \"very low sorptivity\", anabaenopeptin-A, -B and microcystin-LR, -LF, and -LW as \"low sorptivity\", and anatoxin-a and microcystin-RR as \"medium sorptivity\". We remain concerned about irrigating agricultural land with water contaminated with high levels of CYN and MC-LA/-LY because of their relatively low affinity and high desorption proportion in soils. The results also suggest that soil sorption can be an effective immobilization pathway for anatoxin-a and microcystin-RR. The generated data will be useful for prioritizing research on the most bioavailable cyanotoxins/anabaenopeptins that are likely to be released by the soil matrix, for environmental risk assessment.