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Methodenvergleich zur pH‐Bestimmung von Böden
Author(s) -
Schachtschabel P.
Publication year - 1971
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19711300105
Subject(s) - soil water , loess , chemistry , soil ph , mineralogy , environmental chemistry , soil science , geology , geomorphology
Comparison of methods for determining of soil‐pH Comparative studies are being described of pH‐determinations in suspensions with m‐KCl, 0.1 m‐KCl, 0.01 m‐CaCl 2 and water of soils derived from loess and sand. For a standard the pH‐values in 0.01 m‐CaCl 2 ‐suspensions were chosen, considering, that such CaCl 2 ‐solution reflects best conditions in natural soil solution. Mean differences of pH(H 2 O)‐, m‐KCl‐ and 0.1 m‐KCl‐values as compared to pH(CaCl 2 )‐values were + 0.56, — 0.27 and — 0.02 for the soils derived from loess, and + 0.63, — 0.11 and + 0.18 for those from sand. Taking into account the pH‐dependence of the difference pH(CaCl 2 )‐values were + 0.56 – 0.11, — 0.27 – 0.26 and — 0.02 – 0.21, for the soils derived from loess, and + 0.63 – 0.21, — 0.11 – 0.14 and + 0.18 – 0.10 for those from sand. Taking into account the pH‐dependence of the difference of pH(H 2 O)‐values of sandy soils, and its dependence on the present electrolyte content with all soils, further the unequal differences of the pH(KCl)‐values with soils from loess as compared to sand, and their particular large variability with soils from loess, it is being argued that the CaCl 2 ‐method may only insufficiently be substitued by any one of these methods. pH‐values obtained at a soil‐to‐liquid‐ratio of 1:2.5 were only slightly different from those with a ratio of 1:1. A suspension effect could not be observed with the application of a glasselectrode.