This part of GB/T 10209 specifies the determination of free water content for monoammonium phosphate and diammonium phosphate by Karl?Fischer method and vacuum oven method.
It is applicable to the determination of free water content for monoammonium phosphate and diammonium phosphate produced by various processes.
2 Normative references
The following documents contain provisions which, through reference in this part of GB/T 10209, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest editions apply to this part.
GB/T 6283 Chemical products - Determination of water - Karl?Fischer method (general method) (GB/T 6283-2008, ISO 760: 1978, NEQ)
HG/T 2843 Chemical fertilizer products - Standard volumetric, standard, reagent and indicator solutions for chemical analysis
3 Determination
3.1 Karl?Fischer method (arbitration method)
3.1.1 Principle
Conduct quantitative reaction between the free water in the test portion and Karl?Fischer reagent of the known water titer, and the reaction formulas are as follows:
GB/T 10209.3-2010 The following standards are cited：
GB/T 10209.3-2010 Cited by the following standards：
