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磺胺甲噁唑(Sulfamethoxazole,SMX)这类有机污染物(Organic Contaminants,OCs)可以通过多种途径进入农田生态系统,对人类健康和生态环境构成危害。采用批量平衡试验方法,运用高效液相色谱分析技术,研究了不同因素(土壤性质和外在因素)对SMX在水稻土中迁移行为的影响;结合多种方法,掌握SMX在水稻土中的吸附特征,探讨不同因素与SMX行为改变的关系。结果表明:SMX在水稻土中的吸附量与其比表面积呈线性正相关(r=0.996,p<0.001);随水稻土粒径减小,SMX的吸附量呈增大趋势,随溶液酸碱度增大,吸附量逐渐减小;pH<7的水稻土吸附量较pH>7的水稻土高;H/C、O/C、(N+O)/C原子数的比值及O+N+S质量分数较高的水稻土会发生一定变异性;不同形态SMX在水稻土中的吸附能力从大到小依次为阳离子形态、中性分子形态、阴离子形态;不同影响因素在一定程度上控制了农田土壤中SMX的环境地球化学行为。
Sulfamethoxazole (SMX) Organic Contaminants (OCs) can enter farmland ecosystem in many ways, posing a hazard to human health and ecological environment. The effects of different factors (soil properties and extrinsic factors) on the migration of SMX in paddy soils were studied by batch equilibrium test and high-performance liquid chromatography (HPLC). The adsorption of SMX in paddy soils Characteristics, explore the relationship between different factors and SMX behavior changes. The results showed that the sorption amount of SMX in paddy soil was positively correlated with its specific surface area (r = 0.996, p <0.001). With the reduction of soil particle size, the sorption amount of SMX increased with the increase of pH , And the amount of adsorption decreased gradually. The ratio of H / C, O / C, (N + O) / C and O + N + S mass of paddy soil with pH <7 was higher than that of paddy soil with pH> The higher the fractional paddy soil will have some variability; the adsorption capacity of different forms of SMX in paddy soil from order to descending order of cationic morphology, neutral molecular morphology, anionic morphology; different influencing factors to a certain extent, control of farmland soil Environmental geochemical behavior of SMX.