414-2 Determination of Total Sulfur in Fertilizers By High Temperature Combustion: Single-Laboratory Validation.

See more from this Division: SSSA Division: Nutrient Management & Soil & Plant Analysis
See more from this Session: Nutrient Management & Soil & Plant Analysis: II
Wednesday, November 5, 2014: 8:15 AM
Hyatt Regency Long Beach, Beacon Ballroom A
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Tyson Rowland and Jean Bernius, elementar Americas, Inc., Mt Laurel, NJ
A single-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 1150C, 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.
See more from this Division: SSSA Division: Nutrient Management & Soil & Plant Analysis
See more from this Session: Nutrient Management & Soil & Plant Analysis: II