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常用表面活性剂及其复配使用对土壤磷流失及再吸持的影响

Effects of Commonly Used Surfactants and Their Combination on Soil Phosphorus Loss and Retention

  • 摘要: 以3种常用表面活性剂NP-10(壬基酚聚氧乙烯醚10 mol)、TW-80(聚山梨醇酯-80)和SDS(十二烷基硫酸钠)为试材,并将非离子与阴离子表面活性剂复配进行试验,采用土柱淋溶试验,通过测定淋出液中磷含量,淋溶后土壤磷吸附量、Zeta电位及土壤水分特性等,研究了非离子表面活性剂及其复配淋溶下对表层土壤磷流失和再吸持的影响,以期为减少农业面源污染提供参考依据。结果表明:NP-10促进了磷流失,磷流失总量比CK增加了26.04%;但TW-80对土壤磷流失影响相对较小。NP-10、TW-80分别与SDS复配淋溶降低了土壤磷流失量,但仍高于CK 5.24%和13.67%。按磷流失总量,各试验组排序依次为SDS-5>NP-10-5>TW-80+SDS>TW-80-5>NP-10+SDS>CK。土壤磷流失与土壤Zeta电位、土壤持水性均呈正相关。而淋溶后土壤磷吸附量和Zeta电位的相关性最强(R=0.875 0);而与磷流失总量相关性弱。表面活性剂改变了土壤表面电性,对磷的再吸附及后续磷供给有较大影响。

     

    Abstract: Three common surfactants that NP-10(Nonylphenol Ethoxylate 10 mol),TW-80(polysorbate-80) and SDS(sodium dodecyl sulfate) were selected as experimental materials, and the mixture of non-ionic and anionic surfactants was also taken in test.The soil column leaching test was carried out and phosphorus content in leaching solution, soil phosphorus adsorption capacity, Zeta potential and soil moisture characteristics were analyzed to explore the effects of non-ionic surfactants and the mixture surfactants on soil phosphorus loss and retention under leaching, in order to provide reference for reducing agricultural non-point source pollution.The results showed that NP-10 promoted phosphorus loss, comparing with CK,the increase of total phosphorus loss was 26.04%.Meanwhile, TW-80 had relatively little effect on soil phosphorus loss.In combined leaching of NP-10 and TW-80 with SDS respectively, though soil phosphorus loss decreased, but it was still 5.24% and 13.67% higher than CK.According to total phosphorus loss, the order of experimental groups was SDS-5>NP-10-5>TW-80+SDS>TW-80>NP-10+SDS>CK.Soil phosphorus loss was positively correlated with soil Zeta potential and soil water holding capacity.Correlation between soil phosphorus adsorption after leaching and Zeta potential was the strongest(R=0.875 0) while the correlation with total phosphorus loss was weak.Surfactants changed the surface electrical properties of soil and it had great influence on phosphorus re-adsorption and subsequent phosphorus supply.

     

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