This standard specifies the preparation of samples to be tested by the nitric acid-hydrochloric acid-sulfuric acid digestion method and the nitric acid-hydrochloric acid-high acid digestion method; the determination of silica by the colorimetric method of ferrous sulfate; the o-phenanthroline colorimetric method and atomic absorption spectrometry Photometric method was used to determine iron; potassium fluoride was used instead of EDTA to determine aluminum; chromotropic acid colorimetric method and diantipyrine methane colorimetric method were used to determine zinc; potassium periodate colorimetric method and atomic absorption spectrometry were used to determine manganese; Flame photometry is used to determine potassium and sodium; molybdenum antimony colorimetric method is used to determine monuments, etc. This standard is suitable for the determination of forest soil strong acid digestion elements (silicon, iron, aluminum, titanium, manganese, potassium, sodium, calcium, magnesium, and phosphorus).
LY/T 1256-1999 history
1999LY/T 1256-1999 Determination of strong acid digesting elements in forest soil