title: A 5-day method for determination of soluble silicon concentrations in nonliquid fertilizer materials using a sodium carbonate-ammonium nitrate extractant followed by visible spectroscopy with heteropoly blue analysis: single-laboratory validation.
abstract: A 5-day method for determining the soluble silicon (Si) concentrations in nonliquid fertilizer products was developed using a sodium carbonate (Na2CO3)-ammonium nitrate (NH4NO3) extractant followed by visible spectroscopy with heteropoly blue analysis at 660 nm. The 5-Day Na2CO3-NH4NO3 Soluble Si Extraction Method can be applied to quantify the plant-available Si in solid fertilizer products at levels ranging from 0.2 to 8.4% Si with an LOD of 0.06%, and LOQ of 0.20%. This Si extraction method for fertilizers correlates well with plant uptake of Si (r2 = 0.96 for a range of solid fertilizers) and is applicable to solid Si fertilizer products including blended products and beneficial substances. Fertilizer materials can be processed as received using commercially available laboratory chemicals and materials at ambient laboratory temperatures. The single-laboratory validation of the 5-Day Na2CO3-NH4NO3 Soluble Si Extraction Method has been approved by The Association of American Plant Food Control Officials for testing nonliquid Si fertilizer products.
authors.affiliation: Thornton Laboratories Testing & Inspection Services, Tampa, FL 33602, USA.
authors.forename: Dennis
authors.initials: D
authors.lastname: Sebastian
authors.forename: Hugh
authors.initials: H
authors.lastname: Rodrigues
authors.forename: Charles
authors.initials: C
authors.lastname: Kinsey
authors.forename: Gaspar
authors.initials: G
authors.lastname: Korndörfer
authors.forename: Hamilton
authors.initials: H
authors.lastname: Pereira
authors.forename: Guilherme
authors.initials: G
authors.lastname: Buck
authors.forename: Lawrence
authors.initials: L
authors.lastname: Datnoff
authors.forename: Stephen
authors.initials: S
authors.lastname: Miranda
authors.forename: Mary
authors.initials: M
authors.lastname: Provance-Bowley
mesh_terms: D002254:Carbonates / Q000737:chemistry*; D005591:Chemical Fractionation / Q000379:methods*; D005308:Fertilizers / Q000032:analysis*; D007753:Laboratories / Q000592:standards; D009566:Nitrates / Q000737:chemistry*; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012825:Silicon / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D002254:Carbonates; D005308:Fertilizers; D009566:Nitrates; C005686:sodium carbonate; C006568:ammonium nitrate; D012825:Silicon