AOAC ERP Fertilizers - March 2019

3/14/2019

AOAC EXPERT REVIEW PANEL FOR FERTILIZERS  Determination of Total Sulfur in Fertilizers by High  Temperature Combustion 

THURSDAY, MARCH 14, 2019 1:00PM – 4:00PM GAITHERSBURG MARRIOTT WASHINGTONIAN CENTER GAITHERSBURG, MARYLAND 20878 USA

AOAC INTERNATIONAL 2275 Research Blvd, Suite 300 Rockville, Maryland 20850 USA

AOAC EXPERT REVIEW PANEL FOR MICROBIOLOGY FOR FOODS AND ENVIRONMENTAL SURFACES EXPERT REVIEW PANEL FOR FERTILIZERS 

BACKGROUND AND SUMMARY OF METHOD INCLUDING METHOD SCOPE/APPLICABILITY

Total Sulfur (ERP) has adopted the method Total Sulfur in Fertilizers as an AOAC First Action Official  Method SM on December 5, 2017. The method was assigned the AOAC Official Methods SM number  2017.08.  This procedure involves conversion of sulfur (S) species from fertilizers and chemical standards into  SO 2  through combustion at a temperature >1100°C followed by measurement with thermal  conductivity detection (TCD) or infrared (IR) detection reported as weight/weight percentage (w/w %).  In the case of thermal conductivity detection and where simultaneous measurements of additional  elements, such as carbon (C), hydrogen (H), or nitrogen (N), are performed, an intermediate SO 2  separation by thermal adsorption/desorption is necessary. In accordance, this method allows  simultaneous conformation to AOAC Method 993.13, Nitrogen in Fertilizers by Combustion , when using  thermal conductivity detection. (1) 

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Total Sulfur in Fertilizers 2017.08

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