BS ISO 19747:2020 pdf free.Fertilizers and soil conditioners -Determination of monosilicic acid concentrations in nonliquid fertilizer materials.
BS ISO 19747 1 Scope This document establishes a method for the determination of monosilicic acid concentrations in nonliquid fertilizer materials. Monosilicic acid is reported as silicon (Si).This extraction method is applicable to the detection of monosilicic acid in nonliquid fertilizer products,blended products, and beneficial substances at silicon (Si) concentrations of 2 to 84 g/kg, with a limit of detection (LOD] of 0,6 g/kg Si, and a limit of quantification (LOQ) of 2 g/kg correlating well with plant uptake.This method is not applicable to liquid silicon fertilizer sources due to an expected low bias of Si recovery and low correlation with plant uptake.2 Normative References The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 815Z Fertilizers and soil conditioners一Vocabulary.8.1 Glassware, to be thoroughly acid cleaned prior to use in reagent and calibration standard preparation by soaking in a 40ml/l HNO3 solution (6.11) for 30 min and rinsing three times with deionized water. Allow glassware to air dry prior to use. Glassware items needed include 100 ml to 1 l volumetric flasks, 1 I beakers, and assorted 5 to 50 ml calibrated pipets. All glassware (including flasks and pipets) shall conform to Class A tolerances as recommended for routine laboratory applications.8.2 Plastic ware, should be cleaned well with warm clean tap water, followed by triple rinsing with deionized water. Specific plastic ware items needed include: 50 to 1 l graduated cylinders, 200 ml nalgene volumetric flasks with screw closure; 250 ml nalgene erlenmeyer flasks with screw closure;50 ml centrifuge or test tubes with screw closure; 250 ml to 1 I nalgene or fluorinated ethylene propylene (FEP] narrow-mouth storage bottles with screw closure; and 20 I wide-mouth dispensing bottles with screw closure (also nalgene or FEP].BS ISO 19747 pdf download.