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本文应用穆斯堡尔谱学方法,研究了在不同pH条件下Fe~(+++),Fe~(++)与胡敏酸结合的性质。计算机拟合的pH3.0~(57)Fe-胡敏酸络合物泥浆的穆斯堡尔谱和参数表明,三对四极双峰(图1,AA′,BB′,CC′)是合理的。在pH3.0 Fe(++)以高自旋态存在,它和胡敏酸的结合多于一种环境类型。在pH1.0的~(57)Fe-胡敏酸络合物中,观察到了Fe~(+++)的穆斯堡尔谱信号,但没有Fe~(++)的信号,在这个样品离心分离出的液体部分检测到了加入量的59.7%的铁,表明在pH1.0时相当数量的Fe~(+++)被胡敏酸还原成Fe~(++),Fe~(++)并不与胡敏酸牢固结合。在30伏电析过的~(57)Fe-胡敏酸络合物样品中(pH2.8)出现了Fe~(+++),Fe~(++)的穆斯堡尔谱,这一结果指示出,在电析过程中由于~(57)Fe~(+++)-胡敏酸络合物悬浮液pH的降低,一部分Fe~(+++)还原成Fe~(++),在pH2.8相当数量的Fe~(++)与胡敏酸牢固结合。根据在80K记录的穆斯堡尔谱,在pH1—3的范围出现了磁有序成份,但在室温记录的穆斯堡尔谱没有磁分裂。
In this paper, the properties of Fe ~ (+++), Fe ~ (++) combined with humic acid under different pH conditions were investigated by Mossbauer spectroscopy. The Mössbauer spectra and parameters of the computer-fitted pH 3.0 ~ (57) Fe-humic acid complex slurries show that the three pairs of quadrupole doublets (Figure 1, AA ’, BB’, CC ’) are reasonable. At pH 3.0 Fe (++) exists in a high spin state, it binds to humic acid more than one type of environment. In the ~ (57) Fe-humic acid complex at pH1.0, the Mossbauer signal of Fe ~ (+++) was observed, but there was no Fe ~ (++) signal. In this sample The centrifuged liquid fraction detected 59.7% of the added iron, indicating that a significant amount of Fe ~ (+++) was reduced by humic acid to Fe ~ (++), Fe ~ (++) at pH 1.0, ) Does not bind strongly to humic acid. The Mossbauer spectra of Fe ~ (+++) and Fe ~ (++) appeared in the ~ (57) Fe-humic acid complex sample (pH2.8) One result indicates that a part of Fe ~ (+++) was reduced to Fe ~ (++) due to the decrease of the pH of ~ (57) Fe ~ (+++) - humic acid complex suspension during the electro- ), A considerable amount of Fe ~ (++) at pH 2.8 strongly bound to humic acid. According to the Mössbauer spectra recorded at 80K, magnetically ordered components appear in the range of pH 1-3, but the Mössbauer spectra recorded at room temperature have no magnetic splitting.