Phosphorus solubility of agricultural soils: A surface charge and phosphorus-31 NMR speciation study

Tsutomu Ohno, Syuntaro Hiradate, Zhongqi He

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We investigated 10 soils from six states in the United States to determine the relationship between potentiometric titration derived soil surface charge and the concentration of water-extractable P (WEP). Phosphorus-31 nuclear magnetic resonance (NMR) spectroscopy was used to determine the chemical speciation of soil P. The surface charge value at the native soil pH was correlated to the WEP concentration, indicating that electrostatic interactions are involved in determining soil phosphate solubility. The titration curves were fit to a two-site Langmuir model and analysis showed that the native pH surface charge was accounted for by the low pH Type 1 (S-OH2 +) site, attributed to positively charged metal (oxy)hydroxides. The 31P NMR data indicated that 98% of the inorganic form of P was composed of orthophosphate species and 95% of the organic P was composed of the P monoester class compounds. The inorganic orthophosphate form of P was directly related to the total soil P content, suggesting that external fertilizer inputs control the level of this form of soil P. In contrast, P monoester class compound content was not related to total soil P content, suggesting that organic soil P is controlled by P cycling independent of external P inputs. The 31P NMR speciation data indicated that the inorganic orthophosphate, pyrophosphate, and DNA P concentrations in the soils were significantly associated wiThoxalate-extractable Al and Fe concentrations, which further demonstrates that metal (oxy)hydroxides are important surfaces where P species are interacting with soils.

Original languageEnglish
Pages (from-to)1704-1711
Number of pages8
JournalSoil Science Society of America Journal
Volume75
Issue number5
DOIs
Publication statusPublished - Sep 1 2011
Externally publishedYes

Fingerprint

agricultural soils
agricultural soil
nuclear magnetic resonance
nuclear magnetic resonance spectroscopy
solubility
phosphorus
soil
orthophosphates
orthophosphate
hydroxides
titration
hydroxide
metals
chemical speciation
speciation (chemistry)
electrostatic interactions
metal
pyrophosphates
organic soils
organic soil

All Science Journal Classification (ASJC) codes

  • Soil Science

Cite this

Phosphorus solubility of agricultural soils : A surface charge and phosphorus-31 NMR speciation study. / Ohno, Tsutomu; Hiradate, Syuntaro; He, Zhongqi.

In: Soil Science Society of America Journal, Vol. 75, No. 5, 01.09.2011, p. 1704-1711.

Research output: Contribution to journalArticle

@article{056543e82700414ea09a0f184baa3e5f,
title = "Phosphorus solubility of agricultural soils: A surface charge and phosphorus-31 NMR speciation study",
abstract = "We investigated 10 soils from six states in the United States to determine the relationship between potentiometric titration derived soil surface charge and the concentration of water-extractable P (WEP). Phosphorus-31 nuclear magnetic resonance (NMR) spectroscopy was used to determine the chemical speciation of soil P. The surface charge value at the native soil pH was correlated to the WEP concentration, indicating that electrostatic interactions are involved in determining soil phosphate solubility. The titration curves were fit to a two-site Langmuir model and analysis showed that the native pH surface charge was accounted for by the low pH Type 1 (S-OH2 +) site, attributed to positively charged metal (oxy)hydroxides. The 31P NMR data indicated that 98{\%} of the inorganic form of P was composed of orthophosphate species and 95{\%} of the organic P was composed of the P monoester class compounds. The inorganic orthophosphate form of P was directly related to the total soil P content, suggesting that external fertilizer inputs control the level of this form of soil P. In contrast, P monoester class compound content was not related to total soil P content, suggesting that organic soil P is controlled by P cycling independent of external P inputs. The 31P NMR speciation data indicated that the inorganic orthophosphate, pyrophosphate, and DNA P concentrations in the soils were significantly associated wiThoxalate-extractable Al and Fe concentrations, which further demonstrates that metal (oxy)hydroxides are important surfaces where P species are interacting with soils.",
author = "Tsutomu Ohno and Syuntaro Hiradate and Zhongqi He",
year = "2011",
month = "9",
day = "1",
doi = "10.2136/sssaj2010.0404",
language = "English",
volume = "75",
pages = "1704--1711",
journal = "Soil Science Society of America Journal",
issn = "0361-5995",
publisher = "Soil Science Society of America",
number = "5",

}

TY - JOUR

T1 - Phosphorus solubility of agricultural soils

T2 - A surface charge and phosphorus-31 NMR speciation study

AU - Ohno, Tsutomu

AU - Hiradate, Syuntaro

AU - He, Zhongqi

PY - 2011/9/1

Y1 - 2011/9/1

N2 - We investigated 10 soils from six states in the United States to determine the relationship between potentiometric titration derived soil surface charge and the concentration of water-extractable P (WEP). Phosphorus-31 nuclear magnetic resonance (NMR) spectroscopy was used to determine the chemical speciation of soil P. The surface charge value at the native soil pH was correlated to the WEP concentration, indicating that electrostatic interactions are involved in determining soil phosphate solubility. The titration curves were fit to a two-site Langmuir model and analysis showed that the native pH surface charge was accounted for by the low pH Type 1 (S-OH2 +) site, attributed to positively charged metal (oxy)hydroxides. The 31P NMR data indicated that 98% of the inorganic form of P was composed of orthophosphate species and 95% of the organic P was composed of the P monoester class compounds. The inorganic orthophosphate form of P was directly related to the total soil P content, suggesting that external fertilizer inputs control the level of this form of soil P. In contrast, P monoester class compound content was not related to total soil P content, suggesting that organic soil P is controlled by P cycling independent of external P inputs. The 31P NMR speciation data indicated that the inorganic orthophosphate, pyrophosphate, and DNA P concentrations in the soils were significantly associated wiThoxalate-extractable Al and Fe concentrations, which further demonstrates that metal (oxy)hydroxides are important surfaces where P species are interacting with soils.

AB - We investigated 10 soils from six states in the United States to determine the relationship between potentiometric titration derived soil surface charge and the concentration of water-extractable P (WEP). Phosphorus-31 nuclear magnetic resonance (NMR) spectroscopy was used to determine the chemical speciation of soil P. The surface charge value at the native soil pH was correlated to the WEP concentration, indicating that electrostatic interactions are involved in determining soil phosphate solubility. The titration curves were fit to a two-site Langmuir model and analysis showed that the native pH surface charge was accounted for by the low pH Type 1 (S-OH2 +) site, attributed to positively charged metal (oxy)hydroxides. The 31P NMR data indicated that 98% of the inorganic form of P was composed of orthophosphate species and 95% of the organic P was composed of the P monoester class compounds. The inorganic orthophosphate form of P was directly related to the total soil P content, suggesting that external fertilizer inputs control the level of this form of soil P. In contrast, P monoester class compound content was not related to total soil P content, suggesting that organic soil P is controlled by P cycling independent of external P inputs. The 31P NMR speciation data indicated that the inorganic orthophosphate, pyrophosphate, and DNA P concentrations in the soils were significantly associated wiThoxalate-extractable Al and Fe concentrations, which further demonstrates that metal (oxy)hydroxides are important surfaces where P species are interacting with soils.

UR - http://www.scopus.com/inward/record.url?scp=82955239799&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=82955239799&partnerID=8YFLogxK

U2 - 10.2136/sssaj2010.0404

DO - 10.2136/sssaj2010.0404

M3 - Article

AN - SCOPUS:82955239799

VL - 75

SP - 1704

EP - 1711

JO - Soil Science Society of America Journal

JF - Soil Science Society of America Journal

SN - 0361-5995

IS - 5

ER -