Determination of total sulfur in fertilizers by high temperature combustion: single-laboratory validation

Asingle-laboratory validation study was conducted for the determination of total sulfur (S) in a variety of common, inorganic fertilizers by combustion. The procedure involves conversion of S species into SO2 through combustion at 1150 degrees C, absorption then desorption from a purge and trap colu...

Full description

Saved in:
Bibliographic Details
Published in:Journal of AOAC International 2014-05, Vol.97 (3), p.731-735
Main Authors: Bernius, Jean, Kraus, Sabine, Hughes, Sandra, Margraf, Dominik, Bartos, James, Newlon, Natalie, Sieper, Hans-Peter
Format: Article
Language:English
Subjects:
Agricultural research
Chemical properties
Combustion
Composition
Fertilizers
Fertilizers - analysis
Identification and classification
Limit of Detection
Sulfur
Sulfur - analysis
Temperature
Thermal properties
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Asingle-laboratory validation study was conducted for the determination of total sulfur (S) in a variety of common, inorganic fertilizers by combustion. The procedure involves conversion of S species into SO2 through combustion at 1150 degrees C, absorption then desorption from a purge and trap column, followed by measurement by a thermal conductivity detector. Eleven different validation materials were selected for study, which included four commercial fertilizer products, five fertilizers from the Magruder Check Sample Program, one reagent grade product, and one certified organic reference material. S content ranged between 1.47 and 91% as sulfate, thiosulfate, and elemental and organically bound S. Determinations of check samples were performed on 3 different days with four replicates/day. Determinations for non-Magruder samples were performed on 2 different days. Recoveries ranged from 94.3 to 125.9%. ABS SL absolute SD among runs ranged from 0.038 to 0.487%. Based on the accuracy and precision demonstrated here, it is recommended that this method be collaboratively studied for the determination of total S in fertilizers.
ISSN:1060-3271
1944-7922
DOI:10.5740/jaoacint.13-385