Aluminum species in soil solution and their formation conditions.

土壤溶液中铝的形态及其形成条件。

• 批准号: 06660074
• 负责人: KATO Hidemasa
• 金额: $ 0.32万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06660074/
• 关键词: chemical equilibrium; mononuclear Al species; polynuclear Al species; soil solution; sucessive approximation; 近似計算法; 平衡定数; 単核種アルミニウム; 多核種アルミニウム; 多核アルミニウム種; 植物毒性アルミニウム

In order to examine characteristics of aluminum species toxic to plants and their concentrations in acid soils, soil solution extracted from soils of crop fields and forests was examined. Al species and their concentrations were calculated by applying the method of successive approximation reported by Adams (1971). In the present paper, we calculated Al species through the following mass balance equation, assuming that four kinds of polynuclear Al species which have been strongly suggested in several studies using aluminum salt solution can coexist.Alt (total Al) =[Al^<3+>]+[AlOH^<2+>]+[Al(OH)_2^+]+[Al(OH)_3^o]+[AlSO_4^+]+[AlHPO_4^+]+[AlH_2PO_4^<2+>]+2[Al_2(OH)_2^<4+>]+3[Al_3(OH)_4^<5+>]+13[Al_<13>(OH)_<24>^<7+>]+6[Al_6(OH)_<15>^<3+>]The following results were obtained.1) If the pH value of soil solution pH is in the most acid range of 4.7 through 3.0 and the pAlt value ranges from 4.5 through 2.3, Al^<3+> became dominant Al species in Alt.2) If the pH value of soil solution ranges fro … More m 7.3 to 5.3 and the pAlt value ranges from 5 to 2.3, then polynuclear species, Al_6(OH)_<15>^<3+>, becomes dominant Al species in Alt.3) If the pH value of soil solution ranges from 7.3 to 5.3 and the pAlt value ranges from 7.5 to 4.5, then Al(OH)_3^o becomes dominant Al species in Alt.4) In the pH value of range from 7.31 through 3.0 and in the pAlt value range from 7.31 through 2.3, neither Al_2(OH)_2^<4+> nor Al_3(OH)_4^<5+> becomes dominant Al species and the concentration of these species was one hundredth less than the Alt concentration. It is inferred that these polynuclear species can become dominant Al species in alminum salt solution where Alt concentration is larger than 10^<-2> molL^<-1> and the pH value ranges from 5 to 6.5) The ratio of Al_<13>O_4(OH)_<24>^<7+> concentration to Alt concentration is about one to hundred million, and thus the existence can be ignored.6) If the pH value of soil solution ranges from 6.5 through 5 and the pAlt value ranges from 7 through 4 and the pAlt value is almost equal to the pH value, then Al(OH)_2^+ species amounts to dozens of percentages in Alt.7) In the case of cultivated field soils amended by high amounts of phosphate fertilizers, AlHPO_4^+ is recognized as dominant Al species.Based on these results, it is assumed that one of Al^<3+>, Al(OH)_2^+, Al(OH)_3^o, Al_6(OH)_<15>^<3+>, and AlHPO_4^+ becomes dominant Al species in Alt in the pH and pAlt ranges examined. Less

为了研究酸性土壤中对植物有毒的铝种类的特征及其在酸性土壤中的浓度，对农田土壤和森林土壤中提取的土壤溶液进行了检测。采用Adams（1971）报告的逐次逼近法计算了铝种及其浓度。在本文中，我们通过下面的质量平衡方程来计算Al的种类，假设在一些使用铝盐溶液的研究中强烈提出的四种多核Al可以共存。Alt (Al) = (Al ^ < 3 + >] + [AlOH ^ < 2 + >] + [Al (OH) _2 ^ +] + [Al (OH) _3 ^ o] + [AlSO_4 ^ +] + [AlHPO_4 ^ +] + [AlH_2PO_4 ^ < 2 + >) + 2 (Al_2 (OH) _2 ^ < 4 + >) + 3 (Al_3 (OH) _4 ^ < 5 + >) + 13 (Al_ < 13 > (OH) _ < 24 > ^ < 7 + >) + 6 (Al_6 (OH) _ < 15 > ^ < 3 + >]以下结果。1)如果土壤溶液的pH值最酸的pH值在4.7到3.0和pAlt值范围从4.5到2.3,艾尔^ < 3 + >成为占主导地位的物种在Alt.2)如果土壤溶液的pH值范围内来回 ... 多米7.3到5.3 pAlt值范围从5到2.3,然后多核物种,Al_6 (OH) _ < 15 > ^ < 3 + >,成为主导Al物种Alt.3)如果土壤溶液的pH值范围从7.3到5.3,pAlt值范围从7.5到4.5,4)在pH值为7.31 ~ 3.0和pAlt值为7.31 ~ 2.3时，Al_2(OH)_2^<4+>和Al_3(OH)_4^<5+>均未成为优势Al种，其浓度均小于Alt浓度的百分之一。由此推断，在铝盐溶液中，当Alt浓度大于10^<-2> molL^<-1>， pH值在5 ~ 6.5之间时，这些多核种可以成为优势Al种。Al_<13>O_4(OH)_<24>^<7+>浓度与Alt浓度之比约为1比1亿，可以忽略存在。6)当土壤溶液pH值在6.5 ~ 5之间，pAlt值在7 ~ 4之间，pAlt值与pH值基本相等时，Al(OH)_2^+在alt中占几十个百分比。7)在施用大量磷肥的耕地土壤中，AlHPO_4^+被认为是优势Al种。根据这些结果，假设在所测的pH和pAlt范围内，Al^<3+>、Al(OH)_2^+、Al(OH)_3^o、Al_6(OH)_<15>^<3+>和AlHPO_4^+中的一种成为Alt中的优势Al种。少

项目成果

加藤,白井: "スギおよびヒノキ樹幹近傍土壌の酸性化" 日本土壌肥料学雑誌. 66. 57-60 (1995)

Kato, Shirai：“雪松和柏树干附近土壤的酸化”《日本土壤与施肥杂志》66. 57-60 (1995)。

加藤,白井,松川: "酸性土壌の土壌溶液のアルミニウムの形態と濃度" 日本土壌肥料学雑誌. 66. 39-47 (1995)

Kato、Shirai、Matsukawa：“酸性土壤的土壤溶液中铝的形态和浓度”日本土壤与肥料杂志 66. 39-47 (1995)。