SIST ISO 14255:1999 PDF
Soil quality -- Determination of nitrate nitrogen, ammonium nitrogen and total soluble nitrogen in air-dry soils using calcium chloride solution as extractant
Soil quality -- Determination of nitrate nitrogen, ammonium nitrogen and total soluble nitrogen in air-dry soils using calcium chloride solution as extractant
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 12
- Дата публикации:
- 1 марта 1999 г.
- ICS:
- 13.080.10
- Технический комитет:
- KAT - Soil quality
Abstract
Overview
ISO 14255:1998 specifies a laboratory method for measuring soluble nitrogen fractions in air‑dry soils using a calcium chloride extractant. The standard covers extraction and automated analysis of nitrate (NO3 −, including nitrite when relevant), ammonium (NH4 +) and in a 0.01 mol/L calcium chloride (CaCl2) soil extract. Soluble organic nitrogen is obtained by difference (total soluble N minus inorganic N). The method is intended for air‑dry samples pretreated according to .
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