Comparison of salt titration and potentiometric titration methods for the determination of Zero Point of Charge (ZPC)

Sakurai, Katsutoshi; Ohdate, Yohichi; Kyuma, Kazutake

doi:10.1080/00380768.1988.10415671

Cited by 82 publications

(54 citation statements)

References 11 publications

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“…Potentiometric titration curves, ZPC and o'p values were obtained using the STPT methods, described by Sakurai et al (1988). The cross-over point of two acid or base titration curves at different concentrations of the electrolyte is defined as the ZPC at which the adsorption of H + and OH-on the variable charge components is balanced.…”

Section: Methodsmentioning

confidence: 99%

Changes in Zero Point of Charge (ZPC), Specific Surface Area (SSA), and Cation Exchange Capacity (CEC) of kaolinite and montmorillonite, and strongly weathered soils caused by Fe and Al coatings

Sakurai

Teshima

Kyuma

1990

Soil Science and Plant Nutrition

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Section: Methodsmentioning

confidence: 99%

Changes in Zero Point of Charge (ZPC), Specific Surface Area (SSA), and Cation Exchange Capacity (CEC) of kaolinite and montmorillonite, and strongly weathered soils caused by Fe and Al coatings

Sakurai

Teshima

Kyuma

1990

Soil Science and Plant Nutrition

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“…Al, Fe, and Si were determined using a sequential plasma spectrometer (Shimadzu, ICPS-1000IV). 7*ro point of charge (ZPC) and oo value were determined with STPT method (Sakurai et al, 1988 Soil bulk density varied according to land-use system and fire history (Table 2). In the unburnt sites, the lowest bulk density (0.99 g cm') was observed in the CF soil, followed by PF soil (1.L0 g cmr) and AM soil (1.15 g cm.).…”

Section: Study Sitementioning

confidence: 99%

Characteristics of Ultisols under Different Wildfire History in South Sumatra, Indonesia: I. Physico-chemical Properties.

Kadir

悟史

克年

et al. 2001

Tropics

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Fire has become a great threat to Indonesian rainforest. However, informative data quantifying the effects of wildfire on the soils are still limited. We have been studying the leftover effect of forest fire on characteristics of Indonesian Ultisols. Current experiment evaluated physico-chemical characteristics of soils under different ecosystems with different wildfire history. Seven sites, which could be grouped into unburnt sites (conservation forest (CF), Pine forest (iF), Acacia mangium plantation (AM), and home garden (HG)) and burnt sites (Acacia mangilan plantations bumt in i995, L997, and 1998) referred as AM-b95, AM-b97, and AM-b98, respectiveiy, were sampled. Organic layei was found in CR PR and AM but not in any other sites. Morphologically, soils of unbumi sites had darker A horizon than those of burnt sites. In spite of lack of significant differences, bulk density decreased with increasing period after fire, indicating the recovery process. Although the upper layer oi the bumt soils was physically harder than that of the unbumt soils, soil hardness did not aipear to be a limiting factor for plant growth. Soil in the unbumt sites was chemically more acid but contained mqre organic C and N than that in the bumt sites. Surface soil of PF, AM-b98, and HG had much higher exchangeable Ca than any other sites. However the CEC was low across the study sites, irrespectivi of the high clay content. Available P was also low, and conelated with high Al solubility. Crysialline Al, Si, and Fe contents of all soils were higher than amorphous Al, Si, and Fe oxides. ZpC values were low across the study sites. However, higher negative charge generated by organic matter had resulted in lower ZPC values at the surface layer as compared with the subsurface Lyer. Although soils in the unbumt sites showed a better physico-chemical potential than the bumt site;, in general Ultisols in the study sites had undergone strong weathering and showed low natural fertility potential.

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“…d The ratio of the amount of water-dispersible clay particles after shaking for 15 min to that of the completely dispersed clay particles, e Acid oxalate soluble AI. f Zero point of charge determined by the combined salt titration and potentiometric titration (STPT) method proposed by Sakurai et al (1988). g Specific surface area determined by ethylene glycol monoethyl ether method, h A1-Vt, hydroxy-A1 interlayered vermiculite; Kt, kaolinite.…”

Section: Methodsmentioning

confidence: 99%

Effect of removal of free oxides on changes in dispersibility and charge characteristics of soils

Itami¹,

Kitagawa²,

Kyuma³

et al. 1996

Soil Science and Plant Nutrition

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Comparison of salt titration and potentiometric titration methods for the determination of Zero Point of Charge (ZPC)

Cited by 82 publications

References 11 publications

Changes in Zero Point of Charge (ZPC), Specific Surface Area (SSA), and Cation Exchange Capacity (CEC) of kaolinite and montmorillonite, and strongly weathered soils caused by Fe and Al coatings

Changes in Zero Point of Charge (ZPC), Specific Surface Area (SSA), and Cation Exchange Capacity (CEC) of kaolinite and montmorillonite, and strongly weathered soils caused by Fe and Al coatings

Characteristics of Ultisols under Different Wildfire History in South Sumatra, Indonesia: I. Physico-chemical Properties.

Effect of removal of free oxides on changes in dispersibility and charge characteristics of soils

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