【摘要】：[目的]針對(duì)不同施肥方式的農(nóng)田,分析土壤膠體的穩(wěn)定性及其對(duì)四環(huán)素的吸附能力,探討四環(huán)素在土壤中的膠體運(yùn)移性變化。[方法]設(shè)置不施肥對(duì)照(CK)、單施化肥(NPK)和施用有機(jī)肥(OF)3種處理,濕篩沉降法篩分制備0.053~2 mm,0.002~0.053 mm和0.002 mm(土壤膠體)3個(gè)粒徑組土壤顆粒,采用靜置沉降和動(dòng)態(tài)激光散射技術(shù)分析土壤顆粒的分散穩(wěn)定性,探討不同電解質(zhì)條件下土壤膠體的凝聚動(dòng)力學(xué),用zeta電位測(cè)定儀測(cè)定不同電解質(zhì)溶液下土壤膠體表面電位的變化。最后,通過吸附動(dòng)力學(xué)和等溫吸附試驗(yàn)分析不同粒徑組土壤顆粒對(duì)四環(huán)素的吸附能力。[結(jié)果]CK處理中土壤膠體含量最高,且更容易凝聚,穩(wěn)定性最差;施用有機(jī)肥顯著提高了土壤中大顆粒(0.053~2 mm)含量,減少了土壤膠體的釋放。土壤膠體臨界凝絮濃度從大到小的處理分別為OF、NPK、CK。土壤顆粒對(duì)四環(huán)素的吸附能力在OF處理中最強(qiáng);土壤膠體對(duì)四環(huán)素的吸附能力均遠(yuǎn)大于其他粒徑的土壤顆粒和原土。[結(jié)論]施用有機(jī)肥更有利于土壤大顆粒的形成,未團(tuán)聚土壤膠體粒級(jí)更小,zeta電位更負(fù),在水體中穩(wěn)定性更強(qiáng),對(duì)四環(huán)素的吸附能力也更強(qiáng)。因此,施用有機(jī)肥可有效減少土壤中膠體的釋放,并能提高膠體在水體中的穩(wěn)定性及對(duì)污染物四環(huán)素的吸附,從而影響污染物四環(huán)素在土壤中的分布和遷移。
[Abstract]:[aim] to analyze the stability of soil colloid and its adsorption capacity for tetracycline in different fertilization fields, and to explore the change of colloid transport of tetracycline in soil. [methods] three groups of soil particles, 0.053 mm,0.002~0.053 mm and 0.002 mm (soil colloid), were prepared by wet sieving and precipitation, respectively, under the treatment of single application of chemical fertilizer (NPK) and organic fertilizer (OF) in non-fertilized control (CK), and the soil particles of 0.053 mm,0.002~0.053 mm and 0.002 mm (soil colloid) were prepared. The dispersion stability of soil particles was analyzed by static deposition and dynamic laser scattering, and the coagulation kinetics of soil colloids under different electrolyte conditions was discussed. The changes of soil colloid surface potential in different electrolyte solutions were measured by zeta potentiometer. Finally, the adsorption capacity of tetracycline was analyzed by adsorption kinetics and isothermal adsorption test. [results] the content of soil colloid in CK treatment was the highest, which was easier to coagulate and the stability was the worst, and the application of organic fertilizer significantly increased the content of large particles (0.053 ~ 2 mm) in soil and decreased the release of soil colloid. The critical flocculation concentration of soil colloid was OF,NPK,CK. from large to small. The adsorption ability of soil particles to tetracycline was the strongest in OF treatment, and the adsorption ability of soil colloid to tetracycline was much higher than that of other soil particles and original soil. [conclusion] the application of organic fertilizer is more favorable to the formation of large soil particles. The size of colloidal particles in unagglomerated soil is smaller, the zeta potential is more negative, the stability in water is stronger, and the adsorption capacity of tetracycline is stronger. Therefore, the application of organic fertilizer can effectively reduce the release of colloid in soil, and improve the stability of colloid in water and the adsorption of tetracycline, thus affecting the distribution and migration of tetracycline in soil.
【作者單位】： 南京農(nóng)業(yè)大學(xué)資源與環(huán)境科學(xué)學(xué)院;
【基金】：江蘇省自然科學(xué)基金青年基金項(xiàng)目(BK20150682) 江蘇省環(huán)�？蒲姓n題(2015005)
【分類號(hào)】：S153.3;X131.3

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