CAJ | 학술논문

[目的]利用浸提试验研究不同粒径组成的砂土中吸附的铵氮存在形态,为了解铵在包气带中的迁移转化提供参考。[方法]首先用不同初始浓度的NH4Cl溶液浸泡采集于某垃圾填埋场背景区的砂土以及从此砂土中筛分出的粗砂和细砂,再用3种不同浸提能力的浸提剂——水、KCl、CaCl2浸提吸附于土样上的不同形态的铵。[结果]不同浸提剂的浸提能力为：水〈KCl〈CaCl2;当溶液中铵浓度低时,铵优先吸附在矿物的可交换点位,此时铵主要以交换态存在,随着溶液中铵浓度的升高,具备了与矿物内部足够的浓度差驱动力,铵才开始进入2：1型黏土矿物（如伊利石）内部被固定,成为固定态;在粗砂土样中几乎没有固定态铵,即固定态铵主要存在于具有很强吸附能力的2：1型黏土矿物中。[结论]砂土中铵的存在形态与土壤矿物组成和铵的初始浓度密切相关。
[목적]이용침제시험연구불동립경조성적사토중흡부적안담존재형태,위료해안재포기대중적천이전화제공삼고。[방법]수선용불동초시농도적NH4Cl용액침포채집우모랄급전매장배경구적사토이급종차사토중사분출적조사화세사,재용3충불동침제능력적침제제——수、KCl、CaCl2침제흡부우토양상적불동형태적안。[결과]불동침제제적침제능력위：수〈KCl〈CaCl2;당용액중안농도저시,안우선흡부재광물적가교환점위,차시안주요이교환태존재,수착용액중안농도적승고,구비료여광물내부족구적농도차구동력,안재개시진입2：1형점토광물（여이리석）내부피고정,성위고정태;재조사토양중궤호몰유고정태안,즉고정태안주요존재우구유흔강흡부능력적2：1형점토광물중。[결론]사토중안적존재형태여토양광물조성화안적초시농도밀절상관。
[Objective] This research aimed to explore the existing forms of ammonium nitrogen adsorbed in a sandy soil with different particle sizes by extraction experiments and provide references for investigating the transport and transformation of the ammonium in the vadose zone.[Method] Sandy soil sample was collected from a landfill and sieved into coarse sand and fine sand.The three kinds of samples were soaked in NH4Cl solution with different initial concentrations,respectively.Then,ammonium adsorbed in soil samples were extracted by three kinds of extraction agents with different extraction capacity,including water,KCl and CaCl2.[Result] The order of extraction capacity of different extraction agents was：water KCl CaCl2;when the concentration of ammonium was low in solution,the ammonium preferentially adsorbed in the exchangeable positions of minerals and mainly existed in the form of exchangeable ammonium;with the increase of concentration,ammonium entered inside the 2：1 clay minerals with enough driving force of the concentration differences and existed in the form of fixed ammonium;little fixed ammonium was observed in coarse sand samples,which was mainly existed in 2：1 clay minerals with strong extraction capacity.[Conclusion] The existing forms of ammonium were closely related to the mineral compositions in soil and the initial concentrations of ammonium.