Evaluation of Soil Surface Charge Using the Back-Titration Technique

2004 ◽  
Vol 68 (1) ◽  
pp. 82 ◽  
Author(s):  
Ying Ge ◽  
William Hendershot
Keyword(s):  
Surface Charge ◽  
Soil Surface ◽  
Back Titration ◽  
Titration Technique

Modelling soil surface charge density using mineral composition

Geoderma ◽  
2004 ◽  
Vol 121 (1-2) ◽  
pp. 123-133 ◽  
Author(s):  
C. Taubaso ◽  
M. Dos Santos Afonso ◽  
R.M. Torres Sánchez
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Mineral Composition ◽  
Surface Charge Density ◽  
Soil Surface

Interactions BetweenEscherchia coliand the Colloids of Three Variable Charge Soils and Their Effects on Soil Surface Charge Properties

2014 ◽  
Vol 32 (6) ◽  
pp. 511-520 ◽  
Author(s):  
Zhao-Dong Liu ◽  
Zhi-Neng Hong ◽  
Jiu-Yu Li ◽  
Jun Jiang ◽  
Ren-Kou Xu
Keyword(s):  
Surface Charge ◽  
Soil Surface ◽  
Variable Charge ◽  
Variable Charge Soils

Charge characteristics of soil in a lowland tropical moist forest in Panama in response to dry-season irrigation

Soil Research ◽  
2002 ◽  
Vol 40 (2) ◽  
pp. 269 ◽  
Author(s):  
Joseph B. Yavitt ◽  
S. Joseph Wright
Keyword(s):  
Surface Charge ◽  
Surface Soil ◽  
Soil Nutrient ◽  
Soil Surface ◽  
Nutrient Status ◽  
Dry Season ◽  
Soil Nutrient Status ◽  
Variable Charge ◽  
Subsurface Soil ◽  
Moist Forest

Although the hot, moist tropics in the Republic of Panama receive more than 2000 mm of rain per year, soils dry considerably during the 4-month dry season. We examined the effect of seasonal drought by irrigating two 2.25-ha plots of lowland tropical moist forest on Barro Colorado Island (BCI) for 5 consecutive dry seasons. Irrigation decreased soil permeability and improved soil nutrient status, which prompted this study of soil charge characteristics in the irrigated and control plots. Soil was an Alfisol, and thus it was not clear a prioriwhether variable-charge or permanent-charge components dominated. Surface soil (0–15 cm) had a pH(H2O) of 5.5 and pH(KCl) of 4.8. Subsurface soil (30–45 cm) had a pH(H2O) of 4.8 and a pH(KCl) of 3.5. The point of zero salt effect (PZSE), measured by titration, varied from 3.7 to 5.0 in surface soil and from 3.5 to 4.2 in subsurface soil. Variable charge of surface soil was 2.6 cmolc/kg.pH unit after the dry season in April versus 3.2 cmolc/kg.pH unit after the wet season in December in both control and dry-season irrigated plots, reflecting seasonal differences in pH and PZSE. The point of zero net charge (PZNC), measured by ion retention, was at pH <2.0, indicating that permanent-charge components dominated the soil surface charge. Five years of dry-season irrigation resulted in pH(H2O) increasing by 0.6 units and pH(KCl) increasing by 0.2 units. As well, irrigation increased the amount of permanent charge and cation retention, leading to less sorption of phosphate and sulfate. The results have important ecological implications, showing mechanistically how wetter conditions affected soil surface charge leading to improved soil nutrient status. permanent charge, soil pH, tropical forest soil, variable charge, water regime.

Evolution of soil surface charge in a chronosequence of paddy soil derived from Alfisol

2019 ◽  
Vol 192 ◽  
pp. 144-150 ◽  
Author(s):  
Zhenjie Zhao ◽  
E Chang ◽  
Peng Lai ◽  
Ying Dong ◽  
Roukou Xu ◽  
...  
Keyword(s):  
Surface Charge ◽  
Paddy Soil ◽  
Soil Surface

Comparison of Surface Electrochemical Properties between Purple Rocks and their Derived Soils as Related to Pedogenesis

2012 ◽  
Vol 476-478 ◽  
pp. 958-964
Author(s):  
Fei Nan Hu ◽  
Chao Fu Wei ◽  
Jing Du
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Charge Density ◽  
Electrochemical Properties ◽  
Surface Charge ◽  
Surface Potential ◽  
Surface Charge Density ◽  
Soil Surface ◽  
Specific Area ◽  
Parent Rocks

Soil surface electrochemical properties may have an important effect on soil fertility and genesis. Few researches are available on the changes of surface electrochemical properties of purple soils during the pedogenesis. In present work, four purple rocks and their derived soils under arable, orchard, forest and grass were collected to determine surface electrochemical properties including surface specific area, surface charge quantity, surface charge density, electric field strength, and surface potential using the kinetic method. The results indicated that soil surface specific area and surface charge quantity of soils were both significantly higher than their parent rocks. There were similar trends in surface potential, surface charge density and electric field strength of soils and parent rocks, soils derived from Shaximiao Formation (J2s) and Suining Formation (J3s) were higher than those of parent rocks, whereas the reverse trends existed in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p). At the same time, surface potential of soil samples collected from four sites with different land utilization, i.e., Arable, Orchard, Forest and Grass, were determined to illustrate the various trends of soil electrochemical properties change. Under different land use patterns, the descending orders of soil surface potential in Shaximiao Formation (J2s) and Suining Formation (J3s) were both as follows: orchard > forest > arable > grass; the order in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p) were as: orchard > forest > grass > arable. On the other hand, the value of soil surface charge quantity was increased with clay content and soil acidity because of the intensive physical weathering and slight chemical weathering. Therefore, the surface electrochemical properties may have some agreements with the weathering extent of the purple soils. Soil surface potential, surface charge quantity, surface charge density, electric field strength, and surface specific area could be employed as reference criteria for pedogenesis of purple soils.

scholarly journals Charge Characteristics and Cation Exchanges Properties of Hilly Dryland Soils Aceh Besar, Indonesia

2020 ◽  
Vol 9 (2) ◽  
pp. 90-101
Author(s):  
Sufardi Sufardi ◽  
Teti Arabia ◽  
Khairullah Khairullah ◽  
Karnilawati Karnilawati ◽  
Sahbudin Sahbudin ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Surface Charge ◽  
Organic Amendments ◽  
Chemical Properties ◽  
Soil Surface ◽  
Tropical Soils ◽  
Exchange Capacity ◽  
Surface Charges ◽  
Variable Charge ◽  
Negative Surface

Soil surface charge and cation exchange are important parameters of soil fertility in tropical soils. This study was conducted to investigate characteristics of surface charges and cation exchanges on four soil orders of the dryland in  Aceh Besar district. The soil order includes Entisols Jantho (05o16’58.41” N; 95o37’51.82” E), Andisols Saree (05o27'15.6" N; 95o44'09,1" E), Inceptisols Cucum (05º18’18,37” N; 95º32’48,04” E), dan Oxisols Lembah Seulawah (05o27’19,4” N; 95o46’19,2” E). The charge characteristics of surface charge are evaluated from the parameter of DpH (pHH2O-pHKCl), variable charge (Vc), permanent charge (Pc), and point of zero charges (PZC). In contrast, cation exchange properties are evaluated from several soil chemical properties, such as soil organic matter (SOM), base saturation (BS), cation exchange capacity (CEC), and effective CEC (ECEC). The results show that the four pedons of soil in the hilly dryland of Aceh Besar include a variable charge because it has a PZC, which is characterized by a negative surface charge with a PZC of pHH2O and has CEC dependent soil pH. PZC value varies from 3.21 – 5.26 and sequentially PZC Andisols Oxisols Entisols Inceptisols. The total CEC value differs considerably from ECEC and the sum of cations. CEC total of the soils varies from 12.8 – 34.4 cmol kg-1, whereas the ECEC values vary from 2.72 – 8.66 cmol kg-1. The highest variable charge percentage is found in Andisols Saree. In contrast, the highest permanent charge is found in Inceptisols Cucum and is positively correlated with pHH20, PZC, CEC, and sums of cations or ECEC. Improving soil quality in hilly dryland soils in Aceh Besar District can be done by decreasing the PZC status of soils with organic amendments and fertilizers or increasing the pH by using liming.

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