Bemerkungen zur mechanischen Bodenanalyse. III. Ein neuer Pipettapparat

Köhn, Manfred

doi:10.1002/jpln.19280110104

Cited by 44 publications

(13 citation statements)

References 4 publications

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“…In order to support the stratigraphical interpretation, wet-sieve pipette analysis (Köhn, 1928) was carried out to investigate the grain size distribution of sediment cores AKT 35 and 35c. Samples were pretreated with H 2 O 2 (30%) and 0.5 N Na 4 P 2 O 7 (55.7 g/l) to remove organic carbon and for aggregate dispersion.…”

Section: Methodsmentioning

confidence: 99%

The Lefkada barrier and beachrock system (NW Greece) — Controls on coastal evolution and the significance of extreme wave events

et al. 2012

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Section: Methodsmentioning

confidence: 99%

The Lefkada barrier and beachrock system (NW Greece) — Controls on coastal evolution and the significance of extreme wave events

et al. 2012

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“…Particlesize distribution was analyzed with the sieve-pipette method according to Köhn (1928) and the DIN standard (DIN ISO, 11277, 2002). Organic carbon (OC) and total nitrogen were determined using a Fisons NA 2000 elemental analyzer (Fisons Instruments, Rodano, Milan, Italy).…”

Section: Chemical Analysesmentioning

confidence: 99%

Soil genesis and heterogeneity of phosphorus forms and carbon below mounds inhabited by primary and secondary termites

et al. 2012

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“…The 850 mL suspension (section 2.3) served for the sedimentation analysis (<63 lm) which was performed with a modified pipette apparatus according to Köhn (1928) and the DIN standard (DIN ISO 11277, 2002). Calculation of the settlement velocity was accomplished by postulating an average particle density of 2.65 g cm -3 for the Stokes' equation.…”

Section: Sedimentation Analysismentioning

confidence: 99%

Determination of soil texture: Comparison of the sedimentation method and the laser‐diffraction analysis

Taubner

Roth

Tippkötter

2009

Z. Pflanzenernähr. Bodenk.

109

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Laser-diffraction analysis (LDA) is a rapid automated method achieving highly resolved frequency distributions of particle sizes. Recently, LDA has come into use in environmental sciences. However, in the size range of silt and clay deviations from the particle-size analysis with the standard pipette method, which is regarded as the reference method for soil-texture classification, have been reported. Therefore, this study concentrates (1) on the verification of systematic relations between both methods using a series of soils of Lower Saxony (Germany) and (2) on the general applicability of the laser-diffraction method to soil-texture classification as well as (3) texture-based estimates of air capacity, available field capacity, and permanent wilting point. The comparison of LDA with the pipette method demonstrated highly significant linear correlations in each of the particle-size fractions from clay to coarse silt. The slope of regressions ranged from 0.4 with fine silt to 3.1 with clay. If the clay content derived from LDA was applied to texture classification, the resulting textural classes differed from the standard textural classes, except for purely sandy samples with a clay content of <5%. However, the linear-regression model enabled an approach of the LDA-based clay content to values produced with the standard pipette method. Using this transformation, a texture classification became practicable in many cases, but, despite of a high significance level between LDA and pipette method, still led to wrong textural classes in several cases. A comparison with regression models from other regions in Europe showed both similarities and discrepancies, even for similar substrates. Hence, the laser-diffraction analysis cannot be used for the texture classification of soil samples without verification by the standard pipette method.

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Bemerkungen zur mechanischen Bodenanalyse. III. Ein neuer Pipettapparat

Cited by 44 publications

References 4 publications

The Lefkada barrier and beachrock system (NW Greece) — Controls on coastal evolution and the significance of extreme wave events

The Lefkada barrier and beachrock system (NW Greece) — Controls on coastal evolution and the significance of extreme wave events

Soil genesis and heterogeneity of phosphorus forms and carbon below mounds inhabited by primary and secondary termites

Determination of soil texture: Comparison of the sedimentation method and the laser‐diffraction analysis

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