ISO 17319:2015
[Current]
Fertilizers and soil conditioners — Determination of water-soluble potassium content — Potassium tetraphenylborate gravimetric method
...ssium
nitrate)
2,023 9 0402 6 0,165 4 0,264 9 0,167 7 0,408 2 101,39
2,069 3 0,403 3 0,165 7 0,267 0 0,167 7 0,408 2 101,21
organic-in-
organic com-
pound fertilizer
N-P-K = 127-6
[urea, calcium
magnesium phos-
phate, ammonium
phosphate, mag-
nesi...
...1421 0345 9 98,14
2,460 4 0,353 2 0145 1 0,267 3 0,146 3 0,356 1 100,83
NOTE 1 Blank experiments precipitation is 0,001 2 g
NOTE 2 The standard reference material added is pure reagent grade potassium sulfate, with the content of K
2
O of 53,98 %...
...7 we found that the recovery rates (without HCHO method) of different potassium raw
material compound fertilizers and organic-inorganic compound fertilizer lie between 98,14 % and
101,87 %, which indicates a high quality of accuracy...
