Pretreatment of Soil Samples Rich in Short-Range-Order Minerals Before Particle-Size Analysis by the Pipette Method

K.ALARY; D.BABRE; L.CANER; F.FEDER; M.SZWARC; M.NAUDAN; G.BOURGEON

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Pretreatment of Soil Samples Rich in Short-Range-Order Minerals Before Particle-Size Analysis by the Pipette Method

机译：通过移液管方法进行粒度分析之前，对富含短程矿物的土壤样品进行预处理

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The possibilities of combining the dissolution of short-range-order minerals (SROMs) like allophane and imogolite,by ammonium oxalate and a particle size distribution analysis performed by the pipette method were investigated by tests on a soil sample from Reunion,a volcanic island located in the Indian Ocean,having a large SROMs content.The need to work with moist soil samples was again emphasized because the microaggregates formed during air-drying are resistant to the reagent.The SROM content increased,but irregularly,with the number of dissolutions by ammonium oxalate:334 and 470 mg g-1 of SROMs were dissolved after one and three dissolutions respectively.Six successive dissolutions with ammonium oxalate on the same soil sample showed that 89％ of the sum of oxides extracted by the 6 dissolutions were extracted by the first dissolution (mean 304 mg g-1).A compromise needs to be found between the total removal of SROMs by large quantities of ammonium oxalate and the preservation of clay minerals,which were unexpectedly dissolved by this reagent.These tests enabled a description of the clay assemblage of the soil (gibbsite,smectite,and traces of kaolinite) in an area where such information was lacking due to the difficulties encountered in recupcration of the clay fraction.

机译：通过对来自位于火山岛的留尼汪岛的土壤样品进行测试，研究了结合使用草酸铵溶解短链矿物（SROM）（如Allophane和imogolite）以及通过吸液管法进行粒度分布分析的可能性。在印度洋，SROMs含量高。再次强调需要处理潮湿的土壤样品，因为风干过程中形成的微团聚体对试剂具有抵抗力。SROM含量增加，但不规则地随着溶出度的增加而增加。草酸铵：一和三次溶解分别溶解了334和470 mg g-1的SROM。在同一土壤样品上连续六次用草酸铵溶解表明，六种溶解方法提取的氧化物总量的89％是通过草酸铵提取的。第一次溶解（平均304 mg g-1）。需要在大量草酸铵完全去除SROM和保存c这些矿物使这些试剂出乎意料地溶解了。粘土分数。

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《土壤圈（英文版）》 |2013年第1期|20-28|共9页
作者
K.ALARY; D.BABRE; L.CANER; F.FEDER; M.SZWARC; M.NAUDAN; G.BOURGEON;
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作者单位

CIRAD, US Analyse, F-34 398 Montpellier,France;

CIRAD, US Analyse, F-34 398 Montpellier,France;

Université de Poitiers, IC2MP-HydrASA UMR 7285, F-86 022 Poitiers,France;

CIRAD, UPR Recyclage et risque, 18 524 Dakar,Sénégal;

CIRAD, UPR Recyclage et risque, F-97 408 Saint-Denis La Réunion,France;

CIRAD, US Analyse, F-34 398 Montpellier,France;

CIRAD, US Analyse, F-34 398 Montpellier,France;

CIRAD, UPR Recyclage et risque, F-34 398 Montpellier,France;

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Pretreatment of Soil Samples Rich in Short-Range-Order Minerals Before Particle-Size Analysis by the Pipette Method

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