腐植酸
腐植痠
부식산
HUMIC ACID
2013年
5期
24-32
,共9页
R.Lopez(著)%D.Gondar(著)%J.Antelo(著)%S.Fiol(著)%F.Arce(著)%李双(译)
R.Lopez(著)%D.Gondar(著)%J.Antelo(著)%S.Fiol(著)%F.Arce(著)%李雙(譯)
R.Lopez(저)%D.Gondar(저)%J.Antelo(저)%S.Fiol(저)%F.Arce(저)%리쌍(역)
腐植酸%泥炭%腐殖质%酸碱性
腐植痠%泥炭%腐殖質%痠堿性
부식산%니탄%부식질%산감성
humic acid%peat%humus%acid-base properties
为了更准确地解释天然有机质与阳离子的结合行为，必须研究两种状态下的天然有机质，即聚合态和溶解态。本研究以泥炭中的腐黑物和腐殖酸为试验材料，在不同离子强度下进行电位滴定试验。其中，腐植酸样品分为溶液(溶解态腐植酸)和悬浮液(聚合态腐植酸)两种处理，将得到的相应电荷变化曲线与之前获得的泥炭滴定曲线采用NICA-唐南模型进行比较分析。结果表明，在整个滴定过程中，溶解态的腐植酸都得到了较好的电荷变化曲线，而同样条件下，聚合态的腐植酸由于在pH<6的条件下，构象发生了变化，样品不断溶解，没能得到确切的电荷变化曲线。与此同时，本研究还发现，泥炭和腐黑物显示出相似的质子结合行为，但都与腐殖酸不同。其中，唐南模型中参数b的值，与滴定标准液的体积和离子强度有关，泥炭和腐黑物受二者影响较大，而无论是溶解态的还是聚合态的腐植酸受影响都较小。另外，泥炭和腐黑物中酚基官能团和羧基官能团比例也比腐殖酸的要大。NICA-唐南模型揭示了泥炭与阳离子结合能力与腐黑物更为相似。
為瞭更準確地解釋天然有機質與暘離子的結閤行為，必鬚研究兩種狀態下的天然有機質，即聚閤態和溶解態。本研究以泥炭中的腐黑物和腐殖痠為試驗材料，在不同離子彊度下進行電位滴定試驗。其中，腐植痠樣品分為溶液(溶解態腐植痠)和懸浮液(聚閤態腐植痠)兩種處理，將得到的相應電荷變化麯線與之前穫得的泥炭滴定麯線採用NICA-唐南模型進行比較分析。結果錶明，在整箇滴定過程中，溶解態的腐植痠都得到瞭較好的電荷變化麯線，而同樣條件下，聚閤態的腐植痠由于在pH<6的條件下，構象髮生瞭變化，樣品不斷溶解，沒能得到確切的電荷變化麯線。與此同時，本研究還髮現，泥炭和腐黑物顯示齣相似的質子結閤行為，但都與腐殖痠不同。其中，唐南模型中參數b的值，與滴定標準液的體積和離子彊度有關，泥炭和腐黑物受二者影響較大，而無論是溶解態的還是聚閤態的腐植痠受影響都較小。另外，泥炭和腐黑物中酚基官能糰和羧基官能糰比例也比腐殖痠的要大。NICA-唐南模型揭示瞭泥炭與暘離子結閤能力與腐黑物更為相似。
위료경준학지해석천연유궤질여양리자적결합행위，필수연구량충상태하적천연유궤질，즉취합태화용해태。본연구이니탄중적부흑물화부식산위시험재료，재불동리자강도하진행전위적정시험。기중，부식산양품분위용액(용해태부식산)화현부액(취합태부식산)량충처리，장득도적상응전하변화곡선여지전획득적니탄적정곡선채용NICA-당남모형진행비교분석。결과표명，재정개적정과정중，용해태적부식산도득도료교호적전하변화곡선，이동양조건하，취합태적부식산유우재pH<6적조건하，구상발생료변화，양품불단용해，몰능득도학절적전하변화곡선。여차동시，본연구환발현，니탄화부흑물현시출상사적질자결합행위，단도여부식산불동。기중，당남모형중삼수b적치，여적정표준액적체적화리자강도유관，니탄화부흑물수이자영향교대，이무론시용해태적환시취합태적부식산수영향도교소。령외，니탄화부흑물중분기관능단화최기관능단비례야비부식산적요대。NICA-당남모형게시료니탄여양리자결합능력여부흑물경위상사。
For accurate interpretation of cation binding to natural organic matter, the proton binding behaviour of both solid and dissolved natural organic matter must ifrst be established. In the present study, potentiometric titrations of samples of humin and humic acid extracted from a peat soil were performed at different ionic strengths. Humic acid (HA) samples in solution (dissolved humic acid, DHA) and in suspension (aggregated humic acid, AHA) were titrated. The corresponding charge curves were analysed with the NICA-Donnan model and the results were compared with those previously obtained for the peat soil. Good reproduction of the DHA charge curves was obtained, and in the case of the AHA, the exact forms of the charge curves were not reproduced at pH<6 because of the conformational changes and dissolution of the sample that took place throughout the titration. The peat and humin displayed similar proton bind-ing behaviour, which was different to that of the humic acid. With the Donnan approach, the value of parameter b, that relates the Donnan volume to the ionic strength, was the same for peat and humin and less than that of the humic acid,for both the dissolved samples and those in suspension, indicating that the effect of ionic strength on the charge is greater in the peat and humin than in the HA. The ratio between the contents of phenolic groups and of carboxylic groups was greater in peat and humin than in humic acid. The model used revealed that the acid-base behaviour of the peat is closer to that of the humin than to that of the humic acid.
