Studies of aluminium complexation to humic and fulvic acids using a method for the determination of quickly reacting aluminium

1995 ◽  
Vol 84 (1-2) ◽  
pp. 103-116 ◽  
Author(s):  
N. Clarke ◽  
L. -G. Danielsson ◽  
A. Spar�n
Keyword(s):  
Fulvic Acids ◽  
Humic And Fulvic Acids

scholarly journals Determination of humic and fulvic acids in river waters by concentration with anion exchanger followed by centrifugation.

1989 ◽  
Vol 5 (3) ◽  
pp. 363-365 ◽  
Author(s):  
Tsutomu NOMIZU ◽  
Masaki SANJI ◽  
Masataka HIRAIDE ◽  
Atsushi MIZUIKE
Keyword(s):  
Anion Exchanger ◽  
Fulvic Acids ◽  
Humic And Fulvic Acids ◽  
River Waters

Natural Sulphide Minerals as Sensors for Determination of Total Acidity of Humic and Fulvic Acids

2009 ◽  
Vol 7 (4) ◽  
pp. 523-529
Author(s):  
M. M. Antonijevic ◽  
Z. Simic ◽  
Z. Petrovic
Keyword(s):  
Fulvic Acids ◽  
Total Acidity ◽  
Humic And Fulvic Acids ◽  
Sulphide Minerals

Use of the cation exchange equilibrium method for the determination of stability constants of Co(II) with soil humic and fulvic acids

1999 ◽  
Vol 241 (3) ◽  
pp. 651-654 ◽  
Author(s):  
J. Z. Du ◽  
W. J. Li ◽  
H. Q. Zhang ◽  
X. D. Wang ◽  
Z. J. You ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Stability Constants ◽  
Fulvic Acids ◽  
Exchange Equilibrium ◽  
Humic And Fulvic Acids ◽  
Equilibrium Method

A New Standardized Method for Quantification of Humic and Fulvic Acids in Humic Ores and Commercial Products

2014 ◽  
Vol 97 (3) ◽  
pp. 721-730 ◽  
Author(s):  
Richard T Lamar ◽  
Daniel C Olk ◽  
Lawrence Mayhew ◽  
Paul R Bloom
Keyword(s):  
Humic Substances ◽  
Volume Ratio ◽  
Fulvic Acids ◽  
Humic And Fulvic Acids ◽  
Test Portion ◽  
Liquid Products ◽  
Acrylic Ester ◽  
Standardized Method ◽  
Mass Test

Abstract Increased use of humic substances in agriculture has generated intense interest among producers, consumers, and regulators for an accurate and reliable method to quantify humic acid (HA) and fulvic acid (FA) in raw ores and products. Here we present a thoroughly validated method, the new standardized method for determination of HA and FA contents in raw humate ores and in solid and liquid products produced from them. The methods used for preparation of HA and FA were adapted according to the guidelines of the International Humic Substances Society involving alkaline extraction followed by acidification to separate HA from the fulvic fraction. This is followed by separation of FA from the fulvic fraction by adsorption on a nonionic macroporous acrylic ester resin at acid pH. It differs from previous methods in that it determines HA and FA concentrations gravimetrically on an ash-free basis. Critical steps in the method, e.g., initial test portion mass, test portion to extract volume ratio, extraction time, and acidification of alkaline extract, were optimized for maximum and consistent recovery of HA and FA. The method detection limits for HA and FA were 4.62 and 4.8 mg/L, respectively. The method quantitation limits for HA and FA were 14.7 and 15.3 mg/L, respectively.

Determination of dissolved organic matter based on UV-light induced reduction of ionic silver to metallic nanoparticles by humic and fulvic acids

2014 ◽  
Vol 812 ◽  
pp. 121-128 ◽  
Author(s):  
Vasiliki A. Gatselou ◽  
Dimosthenis L. Giokas ◽  
Athanasios G. Vlessidis
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Metallic Nanoparticles ◽  
Uv Light ◽  
Fulvic Acids ◽  
Humic And Fulvic Acids ◽  
Ionic Silver
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