Premium
Determination of Boron in Soils Containing Inorganic and Organic Boron Sources
Author(s) -
Kaplan D. I.,
Adriano D. C.,
Mills G. L.,
Sajwan K. S.,
Burkman W. G.
Publication year - 1990
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1990.03615995005400030013x
Subject(s) - chemistry , boron , soil water , boiling , hydrolysis , extraction (chemistry) , nuclear chemistry , chromatography , organic chemistry , environmental science , soil science
Laboratory experiments were conducted to evaluate the potential interference of organoborates with the commonly used azomethine‐H method of determining B in soils. In addition, an alternative method, the cold‐water‐extractable B (CWE‐B) method, was developed and compared with the commonly used hot‐water‐extractable B (HWE‐B) method on soils containing organoborates. In a solution study, the organoborate sodium tetraphenyl‐boron (NaTPB) interfered more than its hydrolysis by‐product diphenylboric acid (DPBA) with the colorimetric detection of B by the azomethine‐H method. The interference was enhanced by boiling these compounds under conditions similar to those required by the HWE‐B method. However, passing these organoborate solutions through C 18 cartridges (an octadecyl‐silane bond phase packing that adsorbs many organic compounds) prior to boiling alleviated the interference. Furthermore, the C 18 cartridges had little effect on inorganic B levels. A study measuring indigenous B levels of 31 diverse soils collected from throughout the USA revealed that the CWE‐B method extracted less B, though its values were highly correlated ( r = 0.84; P ≤ 0.01) to the HWE‐B values. In addition, these HWE‐B and CWE‐B values were almost identically correlated to the same soil properties: pH and exchangeable Ca. The use of C 18 cartridges in conjunction with the CWE‐B method was satisfactory for determining inorganic B levels in soils containing organoborates.